diff --git a/Cargo.toml b/Cargo.toml
index 264eec8c..7f5a8ae0 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -74,12 +74,38 @@ ndk-sys = "0.4.0"
 
 [target.'cfg(any(target_os = "ios", target_os = "macos"))'.dependencies]
 core-foundation = "0.9.3"
-objc2 = ">=0.3.0-beta.3, <0.3.0-beta.4" # Allow `0.3.0-beta.3.patch-leaks`
+objc2 = "0.4.0"
 
 [target.'cfg(target_os = "macos")'.dependencies]
 core-graphics = "0.22.3"
 dispatch = "0.2.0"
 
+[target.'cfg(target_os = "macos")'.dependencies.icrate]
+version = "0.0.3"
+features = [
+    "Foundation",
+    "Foundation_NSArray",
+    "Foundation_NSAttributedString",
+    "Foundation_NSMutableAttributedString",
+    "Foundation_NSData",
+    "Foundation_NSDictionary",
+    "Foundation_NSString",
+    "Foundation_NSProcessInfo",
+    "Foundation_NSThread",
+    "Foundation_NSNumber",
+]
+
+[target.'cfg(target_os = "ios")'.dependencies.icrate]
+version = "0.0.3"
+features = [
+    "Foundation",
+    "Foundation_NSArray",
+    "Foundation_NSString",
+    "Foundation_NSProcessInfo",
+    "Foundation_NSThread",
+    "Foundation_NSSet",
+]
+
 [target.'cfg(target_os = "windows")'.dependencies]
 unicode-segmentation = "1.7.1"
 
diff --git a/src/platform_impl/ios/app_state.rs b/src/platform_impl/ios/app_state.rs
index b34ebddb..7b22e7ef 100644
--- a/src/platform_impl/ios/app_state.rs
+++ b/src/platform_impl/ios/app_state.rs
@@ -15,8 +15,8 @@ use core_foundation::runloop::{
     kCFRunLoopCommonModes, CFRunLoopAddTimer, CFRunLoopGetMain, CFRunLoopRef, CFRunLoopTimerCreate,
     CFRunLoopTimerInvalidate, CFRunLoopTimerRef, CFRunLoopTimerSetNextFireDate,
 };
-use objc2::foundation::{CGRect, CGSize, NSInteger, NSProcessInfo};
-use objc2::rc::{Id, Shared};
+use icrate::Foundation::{CGRect, CGSize, NSInteger, NSProcessInfo};
+use objc2::rc::Id;
 use objc2::runtime::Object;
 use objc2::{msg_send, sel};
 use once_cell::sync::Lazy;
@@ -68,25 +68,25 @@ impl Event<'static, Never> {
 #[must_use = "dropping `AppStateImpl` without inspecting it is probably a bug"]
 enum AppStateImpl {
     NotLaunched {
-        queued_windows: Vec<Id<WinitUIWindow, Shared>>,
+        queued_windows: Vec<Id<WinitUIWindow>>,
         queued_events: Vec<EventWrapper>,
-        queued_gpu_redraws: HashSet<Id<WinitUIWindow, Shared>>,
+        queued_gpu_redraws: HashSet<Id<WinitUIWindow>>,
     },
     Launching {
-        queued_windows: Vec<Id<WinitUIWindow, Shared>>,
+        queued_windows: Vec<Id<WinitUIWindow>>,
         queued_events: Vec<EventWrapper>,
         queued_event_handler: Box<dyn EventHandler>,
-        queued_gpu_redraws: HashSet<Id<WinitUIWindow, Shared>>,
+        queued_gpu_redraws: HashSet<Id<WinitUIWindow>>,
     },
     ProcessingEvents {
         event_handler: Box<dyn EventHandler>,
-        queued_gpu_redraws: HashSet<Id<WinitUIWindow, Shared>>,
+        queued_gpu_redraws: HashSet<Id<WinitUIWindow>>,
         active_control_flow: ControlFlow,
     },
     // special state to deal with reentrancy and prevent mutable aliasing.
     InUserCallback {
         queued_events: Vec<EventWrapper>,
-        queued_gpu_redraws: HashSet<Id<WinitUIWindow, Shared>>,
+        queued_gpu_redraws: HashSet<Id<WinitUIWindow>>,
     },
     ProcessingRedraws {
         event_handler: Box<dyn EventHandler>,
@@ -204,9 +204,7 @@ impl AppState {
         });
     }
 
-    fn did_finish_launching_transition(
-        &mut self,
-    ) -> (Vec<Id<WinitUIWindow, Shared>>, Vec<EventWrapper>) {
+    fn did_finish_launching_transition(&mut self) -> (Vec<Id<WinitUIWindow>>, Vec<EventWrapper>) {
         let (windows, events, event_handler, queued_gpu_redraws) = match self.take_state() {
             AppStateImpl::Launching {
                 queued_windows,
@@ -363,7 +361,7 @@ impl AppState {
         }
     }
 
-    fn main_events_cleared_transition(&mut self) -> HashSet<Id<WinitUIWindow, Shared>> {
+    fn main_events_cleared_transition(&mut self) -> HashSet<Id<WinitUIWindow>> {
         let (event_handler, queued_gpu_redraws, active_control_flow) = match self.take_state() {
             AppStateImpl::ProcessingEvents {
                 event_handler,
@@ -451,7 +449,7 @@ impl AppState {
 
 // requires main thread and window is a UIWindow
 // retains window
-pub(crate) unsafe fn set_key_window(window: &Id<WinitUIWindow, Shared>) {
+pub(crate) unsafe fn set_key_window(window: &Id<WinitUIWindow>) {
     let mut this = AppState::get_mut();
     match this.state_mut() {
         &mut AppStateImpl::NotLaunched {
@@ -474,7 +472,7 @@ pub(crate) unsafe fn set_key_window(window: &Id<WinitUIWindow, Shared>) {
 
 // requires main thread and window is a UIWindow
 // retains window
-pub(crate) unsafe fn queue_gl_or_metal_redraw(window: Id<WinitUIWindow, Shared>) {
+pub(crate) unsafe fn queue_gl_or_metal_redraw(window: Id<WinitUIWindow>) {
     let mut this = AppState::get_mut();
     match this.state_mut() {
         &mut AppStateImpl::NotLaunched {
@@ -807,7 +805,7 @@ fn handle_hidpi_proxy(
     mut control_flow: ControlFlow,
     suggested_size: LogicalSize<f64>,
     scale_factor: f64,
-    window: Id<WinitUIWindow, Shared>,
+    window: Id<WinitUIWindow>,
 ) {
     let mut size = suggested_size.to_physical(scale_factor);
     let new_inner_size = &mut size;
@@ -827,7 +825,7 @@ fn handle_hidpi_proxy(
     view.setFrame(new_frame);
 }
 
-fn get_view_and_screen_frame(window: &WinitUIWindow) -> (Id<UIView, Shared>, CGRect) {
+fn get_view_and_screen_frame(window: &WinitUIWindow) -> (Id<UIView>, CGRect) {
     let view_controller = window.rootViewController().unwrap();
     let view = view_controller.view().unwrap();
     let bounds = window.bounds();
@@ -963,7 +961,7 @@ impl NSOperatingSystemVersion {
 pub fn os_capabilities() -> OSCapabilities {
     static OS_CAPABILITIES: Lazy<OSCapabilities> = Lazy::new(|| {
         let version: NSOperatingSystemVersion = unsafe {
-            let process_info = NSProcessInfo::process_info();
+            let process_info = NSProcessInfo::processInfo();
             let atleast_ios_8: bool = msg_send![
                 &process_info,
                 respondsToSelector: sel!(operatingSystemVersion)
diff --git a/src/platform_impl/ios/event_loop.rs b/src/platform_impl/ios/event_loop.rs
index 5db6a662..f2e77e1a 100644
--- a/src/platform_impl/ios/event_loop.rs
+++ b/src/platform_impl/ios/event_loop.rs
@@ -14,8 +14,8 @@ use core_foundation::runloop::{
     CFRunLoopObserverCreate, CFRunLoopObserverRef, CFRunLoopSourceContext, CFRunLoopSourceCreate,
     CFRunLoopSourceInvalidate, CFRunLoopSourceRef, CFRunLoopSourceSignal, CFRunLoopWakeUp,
 };
-use objc2::foundation::{MainThreadMarker, NSString};
-use objc2::rc::{Id, Shared};
+use icrate::Foundation::{MainThreadMarker, NSString};
+use objc2::rc::Id;
 use objc2::ClassType;
 use raw_window_handle::{RawDisplayHandle, UiKitDisplayHandle};
 
@@ -40,7 +40,7 @@ pub(crate) enum EventWrapper {
 #[derive(Debug, PartialEq)]
 pub(crate) enum EventProxy {
     DpiChangedProxy {
-        window: Id<WinitUIWindow, Shared>,
+        window: Id<WinitUIWindow>,
         suggested_size: LogicalSize<f64>,
         scale_factor: f64,
     },
diff --git a/src/platform_impl/ios/ffi.rs b/src/platform_impl/ios/ffi.rs
index b684de50..69db70fc 100644
--- a/src/platform_impl/ios/ffi.rs
+++ b/src/platform_impl/ios/ffi.rs
@@ -2,8 +2,8 @@
 
 use std::convert::TryInto;
 
+use icrate::Foundation::{NSInteger, NSUInteger};
 use objc2::encode::{Encode, Encoding};
-use objc2::foundation::{NSInteger, NSUInteger};
 
 use crate::platform::ios::{Idiom, ScreenEdge};
 
diff --git a/src/platform_impl/ios/mod.rs b/src/platform_impl/ios/mod.rs
index 0e1d2b4f..d70bce56 100644
--- a/src/platform_impl/ios/mod.rs
+++ b/src/platform_impl/ios/mod.rs
@@ -63,7 +63,7 @@
 // window size/position.
 macro_rules! assert_main_thread {
     ($($t:tt)*) => {
-        if !::objc2::foundation::is_main_thread() {
+        if !::icrate::Foundation::is_main_thread() {
             panic!($($t)*);
         }
     };
diff --git a/src/platform_impl/ios/monitor.rs b/src/platform_impl/ios/monitor.rs
index f5273ebd..baa1e3be 100644
--- a/src/platform_impl/ios/monitor.rs
+++ b/src/platform_impl/ios/monitor.rs
@@ -6,8 +6,8 @@ use std::{
     ops::{Deref, DerefMut},
 };
 
-use objc2::foundation::{MainThreadMarker, NSInteger};
-use objc2::rc::{Id, Shared};
+use icrate::Foundation::{MainThreadMarker, NSInteger};
+use objc2::rc::Id;
 
 use super::uikit::{UIScreen, UIScreenMode};
 use crate::{
@@ -18,7 +18,7 @@ use crate::{
 
 // TODO(madsmtm): Remove or refactor this
 #[derive(Debug, PartialEq, Eq, Hash, Clone)]
-pub(crate) struct ScreenModeSendSync(pub(crate) Id<UIScreenMode, Shared>);
+pub(crate) struct ScreenModeSendSync(pub(crate) Id<UIScreenMode>);
 
 unsafe impl Send for ScreenModeSendSync {}
 unsafe impl Sync for ScreenModeSendSync {}
@@ -33,7 +33,7 @@ pub struct VideoMode {
 }
 
 impl VideoMode {
-    fn new(uiscreen: Id<UIScreen, Shared>, screen_mode: Id<UIScreenMode, Shared>) -> VideoMode {
+    fn new(uiscreen: Id<UIScreen>, screen_mode: Id<UIScreenMode>) -> VideoMode {
         assert_main_thread!("`VideoMode` can only be created on the main thread on iOS");
         let refresh_rate_millihertz = refresh_rate_millihertz(&uiscreen);
         let size = screen_mode.size();
@@ -65,7 +65,7 @@ impl VideoMode {
 
 #[derive(Clone, PartialEq, Eq, Hash)]
 pub struct Inner {
-    uiscreen: Id<UIScreen, Shared>,
+    uiscreen: Id<UIScreen>,
 }
 
 #[derive(Clone, PartialEq, Eq, Hash)]
@@ -135,7 +135,7 @@ impl fmt::Debug for MonitorHandle {
 }
 
 impl MonitorHandle {
-    pub(crate) fn new(uiscreen: Id<UIScreen, Shared>) -> Self {
+    pub(crate) fn new(uiscreen: Id<UIScreen>) -> Self {
         assert_main_thread!("`MonitorHandle` can only be created on the main thread on iOS");
         Self {
             inner: Inner { uiscreen },
@@ -182,13 +182,8 @@ impl Inner {
             .uiscreen
             .availableModes()
             .into_iter()
-            .map(|mode| {
-                let mode: *const UIScreenMode = mode;
-                let mode = unsafe { Id::retain(mode as *mut UIScreenMode).unwrap() };
-
-                RootVideoMode {
-                    video_mode: VideoMode::new(self.uiscreen.clone(), mode),
-                }
+            .map(|mode| RootVideoMode {
+                video_mode: VideoMode::new(self.uiscreen.clone(), mode),
             })
             .collect();
 
@@ -222,7 +217,7 @@ fn refresh_rate_millihertz(uiscreen: &UIScreen) -> u32 {
 
 // MonitorHandleExtIOS
 impl Inner {
-    pub(crate) fn ui_screen(&self) -> &Id<UIScreen, Shared> {
+    pub(crate) fn ui_screen(&self) -> &Id<UIScreen> {
         &self.uiscreen
     }
 
@@ -237,10 +232,6 @@ impl Inner {
 pub fn uiscreens(mtm: MainThreadMarker) -> VecDeque<MonitorHandle> {
     UIScreen::screens(mtm)
         .into_iter()
-        .map(|screen| {
-            let screen: *const UIScreen = screen;
-            let screen = unsafe { Id::retain(screen as *mut UIScreen).unwrap() };
-            MonitorHandle::new(screen)
-        })
+        .map(MonitorHandle::new)
         .collect()
 }
diff --git a/src/platform_impl/ios/uikit/application.rs b/src/platform_impl/ios/uikit/application.rs
index 319a6b03..fe64dec8 100644
--- a/src/platform_impl/ios/uikit/application.rs
+++ b/src/platform_impl/ios/uikit/application.rs
@@ -1,6 +1,6 @@
-use objc2::foundation::{CGRect, MainThreadMarker, NSArray, NSObject};
-use objc2::rc::{Id, Shared};
-use objc2::{extern_class, extern_methods, msg_send_id, ClassType};
+use icrate::Foundation::{CGRect, MainThreadMarker, NSArray, NSObject};
+use objc2::rc::Id;
+use objc2::{extern_class, extern_methods, msg_send_id, mutability, ClassType};
 
 use super::{UIResponder, UIWindow};
 
@@ -11,20 +11,21 @@ extern_class!(
     unsafe impl ClassType for UIApplication {
         #[inherits(NSObject)]
         type Super = UIResponder;
+        type Mutability = mutability::InteriorMutable;
     }
 );
 
 extern_methods!(
     unsafe impl UIApplication {
-        pub fn shared(_mtm: MainThreadMarker) -> Option<Id<Self, Shared>> {
+        pub fn shared(_mtm: MainThreadMarker) -> Option<Id<Self>> {
             unsafe { msg_send_id![Self::class(), sharedApplication] }
         }
 
-        pub fn windows(&self) -> Id<NSArray<UIWindow, Shared>, Shared> {
+        pub fn windows(&self) -> Id<NSArray<UIWindow>> {
             unsafe { msg_send_id![self, windows] }
         }
 
-        #[sel(statusBarFrame)]
+        #[method(statusBarFrame)]
         pub fn statusBarFrame(&self) -> CGRect;
     }
 );
diff --git a/src/platform_impl/ios/uikit/coordinate_space.rs b/src/platform_impl/ios/uikit/coordinate_space.rs
index d4d1c06e..790c4756 100644
--- a/src/platform_impl/ios/uikit/coordinate_space.rs
+++ b/src/platform_impl/ios/uikit/coordinate_space.rs
@@ -1,5 +1,5 @@
-use objc2::foundation::NSObject;
-use objc2::{extern_class, ClassType};
+use icrate::Foundation::NSObject;
+use objc2::{extern_class, mutability, ClassType};
 
 extern_class!(
     #[derive(Debug, PartialEq, Eq, Hash)]
@@ -7,5 +7,6 @@ extern_class!(
 
     unsafe impl ClassType for UICoordinateSpace {
         type Super = NSObject;
+        type Mutability = mutability::InteriorMutable;
     }
 );
diff --git a/src/platform_impl/ios/uikit/device.rs b/src/platform_impl/ios/uikit/device.rs
index 9910025a..c663d658 100644
--- a/src/platform_impl/ios/uikit/device.rs
+++ b/src/platform_impl/ios/uikit/device.rs
@@ -1,6 +1,6 @@
-use objc2::foundation::{MainThreadMarker, NSObject};
-use objc2::rc::{Id, Shared};
-use objc2::{extern_class, extern_methods, msg_send_id, ClassType};
+use icrate::Foundation::{MainThreadMarker, NSObject};
+use objc2::rc::Id;
+use objc2::{extern_class, extern_methods, msg_send_id, mutability, ClassType};
 
 use super::super::ffi::UIUserInterfaceIdiom;
 
@@ -10,16 +10,17 @@ extern_class!(
 
     unsafe impl ClassType for UIDevice {
         type Super = NSObject;
+        type Mutability = mutability::InteriorMutable;
     }
 );
 
 extern_methods!(
     unsafe impl UIDevice {
-        pub fn current(_mtm: MainThreadMarker) -> Id<Self, Shared> {
+        pub fn current(_mtm: MainThreadMarker) -> Id<Self> {
             unsafe { msg_send_id![Self::class(), currentDevice] }
         }
 
-        #[sel(userInterfaceIdiom)]
+        #[method(userInterfaceIdiom)]
         pub fn userInterfaceIdiom(&self) -> UIUserInterfaceIdiom;
     }
 );
diff --git a/src/platform_impl/ios/uikit/event.rs b/src/platform_impl/ios/uikit/event.rs
index 9ce24261..fbaccf60 100644
--- a/src/platform_impl/ios/uikit/event.rs
+++ b/src/platform_impl/ios/uikit/event.rs
@@ -1,5 +1,5 @@
-use objc2::foundation::NSObject;
-use objc2::{extern_class, ClassType};
+use icrate::Foundation::NSObject;
+use objc2::{extern_class, mutability, ClassType};
 
 extern_class!(
     #[derive(Debug, PartialEq, Eq, Hash)]
@@ -7,5 +7,6 @@ extern_class!(
 
     unsafe impl ClassType for UIEvent {
         type Super = NSObject;
+        type Mutability = mutability::InteriorMutable;
     }
 );
diff --git a/src/platform_impl/ios/uikit/mod.rs b/src/platform_impl/ios/uikit/mod.rs
index d4243748..42b7e1ed 100644
--- a/src/platform_impl/ios/uikit/mod.rs
+++ b/src/platform_impl/ios/uikit/mod.rs
@@ -4,7 +4,7 @@
 
 use std::os::raw::{c_char, c_int};
 
-use objc2::foundation::NSString;
+use icrate::Foundation::NSString;
 
 mod application;
 mod coordinate_space;
diff --git a/src/platform_impl/ios/uikit/responder.rs b/src/platform_impl/ios/uikit/responder.rs
index 2a3cdb0a..fc5563f7 100644
--- a/src/platform_impl/ios/uikit/responder.rs
+++ b/src/platform_impl/ios/uikit/responder.rs
@@ -1,5 +1,5 @@
-use objc2::foundation::NSObject;
-use objc2::{extern_class, ClassType};
+use icrate::Foundation::NSObject;
+use objc2::{extern_class, mutability, ClassType};
 
 extern_class!(
     #[derive(Debug, PartialEq, Eq, Hash)]
@@ -7,5 +7,6 @@ extern_class!(
 
     unsafe impl ClassType for UIResponder {
         type Super = NSObject;
+        type Mutability = mutability::InteriorMutable;
     }
 );
diff --git a/src/platform_impl/ios/uikit/screen.rs b/src/platform_impl/ios/uikit/screen.rs
index 770b9237..94a55b16 100644
--- a/src/platform_impl/ios/uikit/screen.rs
+++ b/src/platform_impl/ios/uikit/screen.rs
@@ -1,7 +1,7 @@
+use icrate::Foundation::{CGFloat, CGRect, MainThreadMarker, NSArray, NSInteger, NSObject};
 use objc2::encode::{Encode, Encoding};
-use objc2::foundation::{CGFloat, CGRect, MainThreadMarker, NSArray, NSInteger, NSObject};
-use objc2::rc::{Id, Shared};
-use objc2::{extern_class, extern_methods, msg_send_id, ClassType};
+use objc2::rc::Id;
+use objc2::{extern_class, extern_methods, msg_send_id, mutability, ClassType};
 
 use super::{UICoordinateSpace, UIScreenMode};
 
@@ -11,53 +11,54 @@ extern_class!(
 
     unsafe impl ClassType for UIScreen {
         type Super = NSObject;
+        type Mutability = mutability::InteriorMutable;
     }
 );
 
 extern_methods!(
     unsafe impl UIScreen {
-        pub fn main(_mtm: MainThreadMarker) -> Id<Self, Shared> {
+        pub fn main(_mtm: MainThreadMarker) -> Id<Self> {
             unsafe { msg_send_id![Self::class(), mainScreen] }
         }
 
-        pub fn screens(_mtm: MainThreadMarker) -> Id<NSArray<Self, Shared>, Shared> {
+        pub fn screens(_mtm: MainThreadMarker) -> Id<NSArray<Self>> {
             unsafe { msg_send_id![Self::class(), screens] }
         }
 
-        #[sel(bounds)]
+        #[method(bounds)]
         pub fn bounds(&self) -> CGRect;
 
-        #[sel(scale)]
+        #[method(scale)]
         pub fn scale(&self) -> CGFloat;
 
-        #[sel(nativeBounds)]
+        #[method(nativeBounds)]
         pub fn nativeBounds(&self) -> CGRect;
 
-        #[sel(nativeScale)]
+        #[method(nativeScale)]
         pub fn nativeScale(&self) -> CGFloat;
 
-        #[sel(maximumFramesPerSecond)]
+        #[method(maximumFramesPerSecond)]
         pub fn maximumFramesPerSecond(&self) -> NSInteger;
 
-        pub fn mirroredScreen(&self) -> Id<Self, Shared> {
+        pub fn mirroredScreen(&self) -> Id<Self> {
             unsafe { msg_send_id![Self::class(), mirroredScreen] }
         }
 
-        pub fn preferredMode(&self) -> Option<Id<UIScreenMode, Shared>> {
+        pub fn preferredMode(&self) -> Option<Id<UIScreenMode>> {
             unsafe { msg_send_id![self, preferredMode] }
         }
 
-        #[sel(setCurrentMode:)]
+        #[method(setCurrentMode:)]
         pub fn setCurrentMode(&self, mode: Option<&UIScreenMode>);
 
-        pub fn availableModes(&self) -> Id<NSArray<UIScreenMode, Shared>, Shared> {
+        pub fn availableModes(&self) -> Id<NSArray<UIScreenMode>> {
             unsafe { msg_send_id![self, availableModes] }
         }
 
-        #[sel(setOverscanCompensation:)]
+        #[method(setOverscanCompensation:)]
         pub fn setOverscanCompensation(&self, overscanCompensation: UIScreenOverscanCompensation);
 
-        pub fn coordinateSpace(&self) -> Id<UICoordinateSpace, Shared> {
+        pub fn coordinateSpace(&self) -> Id<UICoordinateSpace> {
             unsafe { msg_send_id![self, coordinateSpace] }
         }
     }
diff --git a/src/platform_impl/ios/uikit/screen_mode.rs b/src/platform_impl/ios/uikit/screen_mode.rs
index 1ef1a3dc..096cae49 100644
--- a/src/platform_impl/ios/uikit/screen_mode.rs
+++ b/src/platform_impl/ios/uikit/screen_mode.rs
@@ -1,5 +1,5 @@
-use objc2::foundation::{CGSize, NSObject};
-use objc2::{extern_class, extern_methods, ClassType};
+use icrate::Foundation::{CGSize, NSObject};
+use objc2::{extern_class, extern_methods, mutability, ClassType};
 
 extern_class!(
     #[derive(Debug, PartialEq, Eq, Hash)]
@@ -7,12 +7,13 @@ extern_class!(
 
     unsafe impl ClassType for UIScreenMode {
         type Super = NSObject;
+        type Mutability = mutability::InteriorMutable;
     }
 );
 
 extern_methods!(
     unsafe impl UIScreenMode {
-        #[sel(size)]
+        #[method(size)]
         pub fn size(&self) -> CGSize;
     }
 );
diff --git a/src/platform_impl/ios/uikit/touch.rs b/src/platform_impl/ios/uikit/touch.rs
index d0c7c2c7..bff0e8fb 100644
--- a/src/platform_impl/ios/uikit/touch.rs
+++ b/src/platform_impl/ios/uikit/touch.rs
@@ -1,6 +1,6 @@
+use icrate::Foundation::{CGFloat, CGPoint, NSInteger, NSObject};
 use objc2::encode::{Encode, Encoding};
-use objc2::foundation::{CGFloat, CGPoint, NSInteger, NSObject};
-use objc2::{extern_class, extern_methods, ClassType};
+use objc2::{extern_class, extern_methods, mutability, ClassType};
 
 use super::UIView;
 
@@ -10,27 +10,28 @@ extern_class!(
 
     unsafe impl ClassType for UITouch {
         type Super = NSObject;
+        type Mutability = mutability::InteriorMutable;
     }
 );
 
 extern_methods!(
     unsafe impl UITouch {
-        #[sel(locationInView:)]
+        #[method(locationInView:)]
         pub fn locationInView(&self, view: Option<&UIView>) -> CGPoint;
 
-        #[sel(type)]
+        #[method(type)]
         pub fn type_(&self) -> UITouchType;
 
-        #[sel(force)]
+        #[method(force)]
         pub fn force(&self) -> CGFloat;
 
-        #[sel(maximumPossibleForce)]
+        #[method(maximumPossibleForce)]
         pub fn maximumPossibleForce(&self) -> CGFloat;
 
-        #[sel(altitudeAngle)]
+        #[method(altitudeAngle)]
         pub fn altitudeAngle(&self) -> CGFloat;
 
-        #[sel(phase)]
+        #[method(phase)]
         pub fn phase(&self) -> UITouchPhase;
     }
 );
diff --git a/src/platform_impl/ios/uikit/trait_collection.rs b/src/platform_impl/ios/uikit/trait_collection.rs
index 7ae58d2d..b6af7c9d 100644
--- a/src/platform_impl/ios/uikit/trait_collection.rs
+++ b/src/platform_impl/ios/uikit/trait_collection.rs
@@ -1,6 +1,6 @@
+use icrate::Foundation::{NSInteger, NSObject};
 use objc2::encode::{Encode, Encoding};
-use objc2::foundation::{NSInteger, NSObject};
-use objc2::{extern_class, extern_methods, ClassType};
+use objc2::{extern_class, extern_methods, mutability, ClassType};
 
 extern_class!(
     #[derive(Debug, PartialEq, Eq, Hash)]
@@ -8,12 +8,13 @@ extern_class!(
 
     unsafe impl ClassType for UITraitCollection {
         type Super = NSObject;
+        type Mutability = mutability::InteriorMutable;
     }
 );
 
 extern_methods!(
     unsafe impl UITraitCollection {
-        #[sel(forceTouchCapability)]
+        #[method(forceTouchCapability)]
         pub fn forceTouchCapability(&self) -> UIForceTouchCapability;
     }
 );
diff --git a/src/platform_impl/ios/uikit/view.rs b/src/platform_impl/ios/uikit/view.rs
index 05c22956..216db016 100644
--- a/src/platform_impl/ios/uikit/view.rs
+++ b/src/platform_impl/ios/uikit/view.rs
@@ -1,7 +1,7 @@
+use icrate::Foundation::{CGFloat, CGRect, NSObject};
 use objc2::encode::{Encode, Encoding};
-use objc2::foundation::{CGFloat, CGRect, NSObject};
-use objc2::rc::{Id, Shared};
-use objc2::{extern_class, extern_methods, msg_send_id, ClassType};
+use objc2::rc::Id;
+use objc2::{extern_class, extern_methods, msg_send_id, mutability, ClassType};
 
 use super::{UICoordinateSpace, UIResponder, UIViewController};
 
@@ -12,57 +12,58 @@ extern_class!(
     unsafe impl ClassType for UIView {
         #[inherits(NSObject)]
         type Super = UIResponder;
+        type Mutability = mutability::InteriorMutable;
     }
 );
 
 extern_methods!(
     unsafe impl UIView {
-        #[sel(bounds)]
+        #[method(bounds)]
         pub fn bounds(&self) -> CGRect;
 
-        #[sel(setBounds:)]
+        #[method(setBounds:)]
         pub fn setBounds(&self, value: CGRect);
 
-        #[sel(frame)]
+        #[method(frame)]
         pub fn frame(&self) -> CGRect;
 
-        #[sel(setFrame:)]
+        #[method(setFrame:)]
         pub fn setFrame(&self, value: CGRect);
 
-        #[sel(contentScaleFactor)]
+        #[method(contentScaleFactor)]
         pub fn contentScaleFactor(&self) -> CGFloat;
 
-        #[sel(setContentScaleFactor:)]
+        #[method(setContentScaleFactor:)]
         pub fn setContentScaleFactor(&self, val: CGFloat);
 
-        #[sel(setMultipleTouchEnabled:)]
+        #[method(setMultipleTouchEnabled:)]
         pub fn setMultipleTouchEnabled(&self, val: bool);
 
-        pub fn rootViewController(&self) -> Option<Id<UIViewController, Shared>> {
+        pub fn rootViewController(&self) -> Option<Id<UIViewController>> {
             unsafe { msg_send_id![self, rootViewController] }
         }
 
-        #[sel(setRootViewController:)]
+        #[method(setRootViewController:)]
         pub fn setRootViewController(&self, rootViewController: Option<&UIViewController>);
 
-        #[sel(convertRect:toCoordinateSpace:)]
+        #[method(convertRect:toCoordinateSpace:)]
         pub fn convertRect_toCoordinateSpace(
             &self,
             rect: CGRect,
             coordinateSpace: &UICoordinateSpace,
         ) -> CGRect;
 
-        #[sel(convertRect:fromCoordinateSpace:)]
+        #[method(convertRect:fromCoordinateSpace:)]
         pub fn convertRect_fromCoordinateSpace(
             &self,
             rect: CGRect,
             coordinateSpace: &UICoordinateSpace,
         ) -> CGRect;
 
-        #[sel(safeAreaInsets)]
+        #[method(safeAreaInsets)]
         pub fn safeAreaInsets(&self) -> UIEdgeInsets;
 
-        #[sel(setNeedsDisplay)]
+        #[method(setNeedsDisplay)]
         pub fn setNeedsDisplay(&self);
     }
 );
diff --git a/src/platform_impl/ios/uikit/view_controller.rs b/src/platform_impl/ios/uikit/view_controller.rs
index 03f0e166..515d71b0 100644
--- a/src/platform_impl/ios/uikit/view_controller.rs
+++ b/src/platform_impl/ios/uikit/view_controller.rs
@@ -1,7 +1,7 @@
+use icrate::Foundation::{NSObject, NSUInteger};
 use objc2::encode::{Encode, Encoding};
-use objc2::foundation::{NSObject, NSUInteger};
-use objc2::rc::{Id, Shared};
-use objc2::{extern_class, extern_methods, msg_send_id, ClassType};
+use objc2::rc::Id;
+use objc2::{extern_class, extern_methods, msg_send_id, mutability, ClassType};
 
 use super::{UIResponder, UIView};
 
@@ -12,28 +12,29 @@ extern_class!(
     unsafe impl ClassType for UIViewController {
         #[inherits(NSObject)]
         type Super = UIResponder;
+        type Mutability = mutability::InteriorMutable;
     }
 );
 
 extern_methods!(
     unsafe impl UIViewController {
-        #[sel(attemptRotationToDeviceOrientation)]
+        #[method(attemptRotationToDeviceOrientation)]
         pub fn attemptRotationToDeviceOrientation();
 
-        #[sel(setNeedsStatusBarAppearanceUpdate)]
+        #[method(setNeedsStatusBarAppearanceUpdate)]
         pub fn setNeedsStatusBarAppearanceUpdate(&self);
 
-        #[sel(setNeedsUpdateOfHomeIndicatorAutoHidden)]
+        #[method(setNeedsUpdateOfHomeIndicatorAutoHidden)]
         pub fn setNeedsUpdateOfHomeIndicatorAutoHidden(&self);
 
-        #[sel(setNeedsUpdateOfScreenEdgesDeferringSystemGestures)]
+        #[method(setNeedsUpdateOfScreenEdgesDeferringSystemGestures)]
         pub fn setNeedsUpdateOfScreenEdgesDeferringSystemGestures(&self);
 
-        pub fn view(&self) -> Option<Id<UIView, Shared>> {
+        pub fn view(&self) -> Option<Id<UIView>> {
             unsafe { msg_send_id![self, view] }
         }
 
-        #[sel(setView:)]
+        #[method(setView:)]
         pub fn setView(&self, view: Option<&UIView>);
     }
 );
diff --git a/src/platform_impl/ios/uikit/window.rs b/src/platform_impl/ios/uikit/window.rs
index ed78e56f..b99e96d4 100644
--- a/src/platform_impl/ios/uikit/window.rs
+++ b/src/platform_impl/ios/uikit/window.rs
@@ -1,6 +1,6 @@
-use objc2::foundation::NSObject;
-use objc2::rc::{Id, Shared};
-use objc2::{extern_class, extern_methods, msg_send_id, ClassType};
+use icrate::Foundation::NSObject;
+use objc2::rc::Id;
+use objc2::{extern_class, extern_methods, msg_send_id, mutability, ClassType};
 
 use super::{UIResponder, UIScreen, UIView};
 
@@ -11,25 +11,26 @@ extern_class!(
     unsafe impl ClassType for UIWindow {
         #[inherits(UIResponder, NSObject)]
         type Super = UIView;
+        type Mutability = mutability::InteriorMutable;
     }
 );
 
 extern_methods!(
     unsafe impl UIWindow {
-        pub fn screen(&self) -> Id<UIScreen, Shared> {
+        pub fn screen(&self) -> Id<UIScreen> {
             unsafe { msg_send_id![self, screen] }
         }
 
-        #[sel(setScreen:)]
+        #[method(setScreen:)]
         pub fn setScreen(&self, screen: &UIScreen);
 
-        #[sel(setHidden:)]
+        #[method(setHidden:)]
         pub fn setHidden(&self, flag: bool);
 
-        #[sel(makeKeyAndVisible)]
+        #[method(makeKeyAndVisible)]
         pub fn makeKeyAndVisible(&self);
 
-        #[sel(isKeyWindow)]
+        #[method(isKeyWindow)]
         pub fn isKeyWindow(&self) -> bool;
     }
 );
diff --git a/src/platform_impl/ios/view.rs b/src/platform_impl/ios/view.rs
index 12955f1d..6e2ad3bb 100644
--- a/src/platform_impl/ios/view.rs
+++ b/src/platform_impl/ios/view.rs
@@ -2,11 +2,11 @@
 use std::cell::Cell;
 use std::ptr::NonNull;
 
+use icrate::Foundation::{CGFloat, CGRect, MainThreadMarker, NSObject, NSObjectProtocol, NSSet};
 use objc2::declare::{Ivar, IvarDrop};
-use objc2::foundation::{CGFloat, CGRect, MainThreadMarker, NSObject, NSSet};
-use objc2::rc::{Id, Shared};
+use objc2::rc::Id;
 use objc2::runtime::Class;
-use objc2::{declare_class, extern_methods, msg_send, msg_send_id, ClassType};
+use objc2::{declare_class, extern_methods, msg_send, msg_send_id, mutability, ClassType};
 
 use super::uikit::{
     UIApplication, UIDevice, UIEvent, UIForceTouchCapability, UIInterfaceOrientationMask,
@@ -29,16 +29,17 @@ use crate::{
 };
 
 declare_class!(
-    pub(crate) struct WinitView {}
+    pub(crate) struct WinitView;
 
     unsafe impl ClassType for WinitView {
         #[inherits(UIResponder, NSObject)]
         type Super = UIView;
+        type Mutability = mutability::InteriorMutable;
         const NAME: &'static str = "WinitUIView";
     }
 
     unsafe impl WinitView {
-        #[sel(drawRect:)]
+        #[method(drawRect:)]
         fn draw_rect(&self, rect: CGRect) {
             let window = self.window().unwrap();
             unsafe {
@@ -49,7 +50,7 @@ declare_class!(
             let _: () = unsafe { msg_send![super(self), drawRect: rect] };
         }
 
-        #[sel(layoutSubviews)]
+        #[method(layoutSubviews)]
         fn layout_subviews(&self) {
             let _: () = unsafe { msg_send![super(self), layoutSubviews] };
 
@@ -81,7 +82,7 @@ declare_class!(
             }
         }
 
-        #[sel(setContentScaleFactor:)]
+        #[method(setContentScaleFactor:)]
         fn set_content_scale_factor(&self, untrusted_scale_factor: CGFloat) {
             let _: () =
                 unsafe { msg_send![super(self), setContentScaleFactor: untrusted_scale_factor] };
@@ -131,22 +132,22 @@ declare_class!(
             }
         }
 
-        #[sel(touchesBegan:withEvent:)]
+        #[method(touchesBegan:withEvent:)]
         fn touches_began(&self, touches: &NSSet<UITouch>, _event: Option<&UIEvent>) {
             self.handle_touches(touches)
         }
 
-        #[sel(touchesMoved:withEvent:)]
+        #[method(touchesMoved:withEvent:)]
         fn touches_moved(&self, touches: &NSSet<UITouch>, _event: Option<&UIEvent>) {
             self.handle_touches(touches)
         }
 
-        #[sel(touchesEnded:withEvent:)]
+        #[method(touchesEnded:withEvent:)]
         fn touches_ended(&self, touches: &NSSet<UITouch>, _event: Option<&UIEvent>) {
             self.handle_touches(touches)
         }
 
-        #[sel(touchesCancelled:withEvent:)]
+        #[method(touchesCancelled:withEvent:)]
         fn touches_cancelled(&self, touches: &NSSet<UITouch>, _event: Option<&UIEvent>) {
             self.handle_touches(touches)
         }
@@ -156,16 +157,16 @@ declare_class!(
 extern_methods!(
     #[allow(non_snake_case)]
     unsafe impl WinitView {
-        fn window(&self) -> Option<Id<WinitUIWindow, Shared>> {
+        fn window(&self) -> Option<Id<WinitUIWindow>> {
             unsafe { msg_send_id![self, window] }
         }
 
-        unsafe fn traitCollection(&self) -> Id<UITraitCollection, Shared> {
+        unsafe fn traitCollection(&self) -> Id<UITraitCollection> {
             msg_send_id![self, traitCollection]
         }
 
         // TODO: Allow the user to customize this
-        #[sel(layerClass)]
+        #[method(layerClass)]
         pub(crate) fn layerClass() -> &'static Class;
     }
 );
@@ -176,9 +177,8 @@ impl WinitView {
         _window_attributes: &WindowAttributes,
         platform_attributes: &PlatformSpecificWindowBuilderAttributes,
         frame: CGRect,
-    ) -> Id<Self, Shared> {
-        let this: Id<Self, Shared> =
-            unsafe { msg_send_id![msg_send_id![Self::class(), alloc], initWithFrame: frame] };
+    ) -> Id<Self> {
+        let this: Id<Self> = unsafe { msg_send_id![Self::alloc(), initWithFrame: frame] };
 
         this.setMultipleTouchEnabled(true);
 
@@ -258,7 +258,7 @@ impl WinitView {
     }
 }
 
-struct ViewControllerState {
+pub struct ViewControllerState {
     prefers_status_bar_hidden: Cell<bool>,
     prefers_home_indicator_auto_hidden: Cell<bool>,
     supported_orientations: Cell<UIInterfaceOrientationMask>,
@@ -267,19 +267,22 @@ struct ViewControllerState {
 
 declare_class!(
     pub(crate) struct WinitViewController {
-        state: IvarDrop<Box<ViewControllerState>>,
+        state: IvarDrop<Box<ViewControllerState>, "_state">,
     }
 
+    mod view_controller_ivars;
+
     unsafe impl ClassType for WinitViewController {
         #[inherits(UIResponder, NSObject)]
         type Super = UIViewController;
+        type Mutability = mutability::InteriorMutable;
         const NAME: &'static str = "WinitUIViewController";
     }
 
     unsafe impl WinitViewController {
-        #[sel(init)]
-        fn init(&mut self) -> Option<NonNull<Self>> {
-            let this: Option<&mut Self> = unsafe { msg_send![super(self), init] };
+        #[method(init)]
+        unsafe fn init(this: *mut Self) -> Option<NonNull<Self>> {
+            let this: Option<&mut Self> = msg_send![super(this), init];
             this.map(|this| {
                 // These are set in WinitViewController::new, it's just to set them
                 // to _something_.
@@ -300,27 +303,27 @@ declare_class!(
     }
 
     unsafe impl WinitViewController {
-        #[sel(shouldAutorotate)]
+        #[method(shouldAutorotate)]
         fn should_autorotate(&self) -> bool {
             true
         }
 
-        #[sel(prefersStatusBarHidden)]
+        #[method(prefersStatusBarHidden)]
         fn prefers_status_bar_hidden(&self) -> bool {
             self.state.prefers_status_bar_hidden.get()
         }
 
-        #[sel(prefersHomeIndicatorAutoHidden)]
+        #[method(prefersHomeIndicatorAutoHidden)]
         fn prefers_home_indicator_auto_hidden(&self) -> bool {
             self.state.prefers_home_indicator_auto_hidden.get()
         }
 
-        #[sel(supportedInterfaceOrientations)]
+        #[method(supportedInterfaceOrientations)]
         fn supported_orientations(&self) -> UIInterfaceOrientationMask {
             self.state.supported_orientations.get()
         }
 
-        #[sel(preferredScreenEdgesDeferringSystemGestures)]
+        #[method(preferredScreenEdgesDeferringSystemGestures)]
         fn preferred_screen_edges_deferring_system_gestures(&self) -> UIRectEdge {
             self.state
                 .preferred_screen_edges_deferring_system_gestures
@@ -388,9 +391,8 @@ impl WinitViewController {
         _window_attributes: &WindowAttributes,
         platform_attributes: &PlatformSpecificWindowBuilderAttributes,
         view: &UIView,
-    ) -> Id<Self, Shared> {
-        let this: Id<Self, Shared> =
-            unsafe { msg_send_id![msg_send_id![Self::class(), alloc], init] };
+    ) -> Id<Self> {
+        let this: Id<Self> = unsafe { msg_send_id![Self::alloc(), init] };
 
         this.set_prefers_status_bar_hidden(platform_attributes.prefers_status_bar_hidden);
 
@@ -414,15 +416,17 @@ impl WinitViewController {
 
 declare_class!(
     #[derive(Debug, PartialEq, Eq, Hash)]
-    pub(crate) struct WinitUIWindow {}
+    pub(crate) struct WinitUIWindow;
 
     unsafe impl ClassType for WinitUIWindow {
         #[inherits(UIResponder, NSObject)]
         type Super = UIWindow;
+        type Mutability = mutability::InteriorMutable;
+        const NAME: &'static str = "WinitUIWindow";
     }
 
     unsafe impl WinitUIWindow {
-        #[sel(becomeKeyWindow)]
+        #[method(becomeKeyWindow)]
         fn become_key_window(&self) {
             unsafe {
                 app_state::handle_nonuser_event(EventWrapper::StaticEvent(Event::WindowEvent {
@@ -433,7 +437,7 @@ declare_class!(
             let _: () = unsafe { msg_send![super(self), becomeKeyWindow] };
         }
 
-        #[sel(resignKeyWindow)]
+        #[method(resignKeyWindow)]
         fn resign_key_window(&self) {
             unsafe {
                 app_state::handle_nonuser_event(EventWrapper::StaticEvent(Event::WindowEvent {
@@ -453,9 +457,8 @@ impl WinitUIWindow {
         _platform_attributes: &PlatformSpecificWindowBuilderAttributes,
         frame: CGRect,
         view_controller: &UIViewController,
-    ) -> Id<Self, Shared> {
-        let this: Id<Self, Shared> =
-            unsafe { msg_send_id![msg_send_id![Self::class(), alloc], initWithFrame: frame] };
+    ) -> Id<Self> {
+        let this: Id<Self> = unsafe { msg_send_id![Self::alloc(), initWithFrame: frame] };
 
         this.setRootViewController(Some(view_controller));
 
@@ -482,15 +485,17 @@ impl WinitUIWindow {
 }
 
 declare_class!(
-    pub struct WinitApplicationDelegate {}
+    pub struct WinitApplicationDelegate;
 
     unsafe impl ClassType for WinitApplicationDelegate {
         type Super = NSObject;
+        type Mutability = mutability::InteriorMutable;
+        const NAME: &'static str = "WinitApplicationDelegate";
     }
 
     // UIApplicationDelegate protocol
     unsafe impl WinitApplicationDelegate {
-        #[sel(application:didFinishLaunchingWithOptions:)]
+        #[method(application:didFinishLaunchingWithOptions:)]
         fn did_finish_launching(&self, _application: &UIApplication, _: *mut NSObject) -> bool {
             unsafe {
                 app_state::did_finish_launching();
@@ -498,22 +503,23 @@ declare_class!(
             true
         }
 
-        #[sel(applicationDidBecomeActive:)]
+        #[method(applicationDidBecomeActive:)]
         fn did_become_active(&self, _application: &UIApplication) {
             unsafe { app_state::handle_nonuser_event(EventWrapper::StaticEvent(Event::Resumed)) }
         }
 
-        #[sel(applicationWillResignActive:)]
+        #[method(applicationWillResignActive:)]
         fn will_resign_active(&self, _application: &UIApplication) {
             unsafe { app_state::handle_nonuser_event(EventWrapper::StaticEvent(Event::Suspended)) }
         }
 
-        #[sel(applicationWillEnterForeground:)]
+        #[method(applicationWillEnterForeground:)]
         fn will_enter_foreground(&self, _application: &UIApplication) {}
-        #[sel(applicationDidEnterBackground:)]
+
+        #[method(applicationDidEnterBackground:)]
         fn did_enter_background(&self, _application: &UIApplication) {}
 
-        #[sel(applicationWillTerminate:)]
+        #[method(applicationWillTerminate:)]
         fn will_terminate(&self, application: &UIApplication) {
             let mut events = Vec::new();
             for window in application.windows().iter() {
diff --git a/src/platform_impl/ios/window.rs b/src/platform_impl/ios/window.rs
index 72735645..71875be6 100644
--- a/src/platform_impl/ios/window.rs
+++ b/src/platform_impl/ios/window.rs
@@ -6,8 +6,8 @@ use std::{
     ops::{Deref, DerefMut},
 };
 
-use objc2::foundation::{CGFloat, CGPoint, CGRect, CGSize, MainThreadMarker};
-use objc2::rc::{Id, Shared};
+use icrate::Foundation::{CGFloat, CGPoint, CGRect, CGSize, MainThreadMarker};
+use objc2::rc::Id;
 use objc2::runtime::Object;
 use objc2::{class, msg_send};
 use raw_window_handle::{RawDisplayHandle, RawWindowHandle, UiKitDisplayHandle, UiKitWindowHandle};
@@ -32,9 +32,9 @@ use crate::{
 };
 
 pub struct Inner {
-    pub(crate) window: Id<WinitUIWindow, Shared>,
-    pub(crate) view_controller: Id<WinitViewController, Shared>,
-    pub(crate) view: Id<WinitView, Shared>,
+    pub(crate) window: Id<WinitUIWindow>,
+    pub(crate) view_controller: Id<WinitViewController>,
+    pub(crate) view: Id<WinitView>,
     gl_or_metal_backed: bool,
 }
 
diff --git a/src/platform_impl/macos/app.rs b/src/platform_impl/macos/app.rs
index 864cabd3..8a56b77b 100644
--- a/src/platform_impl/macos/app.rs
+++ b/src/platform_impl/macos/app.rs
@@ -1,7 +1,7 @@
 #![allow(clippy::unnecessary_cast)]
 
-use objc2::foundation::NSObject;
-use objc2::{declare_class, msg_send, ClassType};
+use icrate::Foundation::NSObject;
+use objc2::{declare_class, msg_send, mutability, ClassType};
 
 use super::appkit::{NSApplication, NSEvent, NSEventModifierFlags, NSEventType, NSResponder};
 use super::{app_state::AppState, event::EventWrapper, DEVICE_ID};
@@ -9,18 +9,20 @@ use crate::event::{DeviceEvent, ElementState, Event};
 
 declare_class!(
     #[derive(Debug, PartialEq, Eq, Hash)]
-    pub(super) struct WinitApplication {}
+    pub(super) struct WinitApplication;
 
     unsafe impl ClassType for WinitApplication {
         #[inherits(NSResponder, NSObject)]
         type Super = NSApplication;
+        type Mutability = mutability::InteriorMutable;
+        const NAME: &'static str = "WinitApplication";
     }
 
     unsafe impl WinitApplication {
         // Normally, holding Cmd + any key never sends us a `keyUp` event for that key.
         // Overriding `sendEvent:` like this fixes that. (https://stackoverflow.com/a/15294196)
         // Fun fact: Firefox still has this bug! (https://bugzilla.mozilla.org/show_bug.cgi?id=1299553)
-        #[sel(sendEvent:)]
+        #[method(sendEvent:)]
         fn send_event(&self, event: &NSEvent) {
             // For posterity, there are some undocumented event types
             // (https://github.com/servo/cocoa-rs/issues/155)
diff --git a/src/platform_impl/macos/app_delegate.rs b/src/platform_impl/macos/app_delegate.rs
index 7a57bf8c..4b3be65f 100644
--- a/src/platform_impl/macos/app_delegate.rs
+++ b/src/platform_impl/macos/app_delegate.rs
@@ -1,9 +1,10 @@
 use std::ptr::NonNull;
 
-use objc2::foundation::NSObject;
-use objc2::rc::{Id, Shared};
+use icrate::Foundation::NSObject;
+use objc2::declare::{IvarBool, IvarEncode};
+use objc2::rc::Id;
 use objc2::runtime::Object;
-use objc2::{declare_class, msg_send, msg_send_id, ClassType};
+use objc2::{declare_class, msg_send, msg_send_id, mutability, ClassType};
 
 use super::app_state::AppState;
 use super::appkit::NSApplicationActivationPolicy;
@@ -11,25 +12,28 @@ use super::appkit::NSApplicationActivationPolicy;
 declare_class!(
     #[derive(Debug)]
     pub(super) struct ApplicationDelegate {
-        activation_policy: NSApplicationActivationPolicy,
-        default_menu: bool,
-        activate_ignoring_other_apps: bool,
+        activation_policy: IvarEncode<NSApplicationActivationPolicy, "_activation_policy">,
+        default_menu: IvarBool<"_default_menu">,
+        activate_ignoring_other_apps: IvarBool<"_activate_ignoring_other_apps">,
     }
 
+    mod ivars;
+
     unsafe impl ClassType for ApplicationDelegate {
         type Super = NSObject;
+        type Mutability = mutability::InteriorMutable;
         const NAME: &'static str = "WinitApplicationDelegate";
     }
 
     unsafe impl ApplicationDelegate {
-        #[sel(initWithActivationPolicy:defaultMenu:activateIgnoringOtherApps:)]
+        #[method(initWithActivationPolicy:defaultMenu:activateIgnoringOtherApps:)]
         unsafe fn init(
-            &mut self,
+            this: *mut Self,
             activation_policy: NSApplicationActivationPolicy,
             default_menu: bool,
             activate_ignoring_other_apps: bool,
         ) -> Option<NonNull<Self>> {
-            let this: Option<&mut Self> = unsafe { msg_send![super(self), init] };
+            let this: Option<&mut Self> = unsafe { msg_send![super(this), init] };
             this.map(|this| {
                 *this.activation_policy = activation_policy;
                 *this.default_menu = default_menu;
@@ -38,8 +42,8 @@ declare_class!(
             })
         }
 
-        #[sel(applicationDidFinishLaunching:)]
-        fn did_finish_launching(&self, _sender: *const Object) {
+        #[method(applicationDidFinishLaunching:)]
+        fn did_finish_launching(&self, _sender: Option<&Object>) {
             trace_scope!("applicationDidFinishLaunching:");
             AppState::launched(
                 *self.activation_policy,
@@ -48,8 +52,8 @@ declare_class!(
             );
         }
 
-        #[sel(applicationWillTerminate:)]
-        fn will_terminate(&self, _sender: *const Object) {
+        #[method(applicationWillTerminate:)]
+        fn will_terminate(&self, _sender: Option<&Object>) {
             trace_scope!("applicationWillTerminate:");
             // TODO: Notify every window that it will be destroyed, like done in iOS?
             AppState::exit();
@@ -62,10 +66,10 @@ impl ApplicationDelegate {
         activation_policy: NSApplicationActivationPolicy,
         default_menu: bool,
         activate_ignoring_other_apps: bool,
-    ) -> Id<Self, Shared> {
+    ) -> Id<Self> {
         unsafe {
             msg_send_id![
-                msg_send_id![Self::class(), alloc],
+                Self::alloc(),
                 initWithActivationPolicy: activation_policy,
                 defaultMenu: default_menu,
                 activateIgnoringOtherApps: activate_ignoring_other_apps,
diff --git a/src/platform_impl/macos/app_state.rs b/src/platform_impl/macos/app_state.rs
index 175324ac..1d49d22f 100644
--- a/src/platform_impl/macos/app_state.rs
+++ b/src/platform_impl/macos/app_state.rs
@@ -12,7 +12,7 @@ use std::{
 };
 
 use core_foundation::runloop::{CFRunLoopGetMain, CFRunLoopWakeUp};
-use objc2::foundation::{is_main_thread, NSSize};
+use icrate::Foundation::{is_main_thread, NSSize};
 use objc2::rc::autoreleasepool;
 use once_cell::sync::Lazy;
 
diff --git a/src/platform_impl/macos/appkit/appearance.rs b/src/platform_impl/macos/appkit/appearance.rs
index c13abbff..6db7c6d0 100644
--- a/src/platform_impl/macos/appkit/appearance.rs
+++ b/src/platform_impl/macos/appkit/appearance.rs
@@ -1,6 +1,6 @@
-use objc2::foundation::{NSArray, NSObject, NSString};
-use objc2::rc::{Id, Shared};
-use objc2::{extern_class, extern_methods, msg_send_id, ClassType};
+use icrate::Foundation::{NSArray, NSObject, NSString};
+use objc2::rc::Id;
+use objc2::{extern_class, extern_methods, mutability, ClassType};
 
 extern_class!(
     #[derive(Debug, PartialEq, Eq, Hash)]
@@ -8,6 +8,7 @@ extern_class!(
 
     unsafe impl ClassType for NSAppearance {
         type Super = NSObject;
+        type Mutability = mutability::InteriorMutable;
     }
 );
 
@@ -15,15 +16,13 @@ type NSAppearanceName = NSString;
 
 extern_methods!(
     unsafe impl NSAppearance {
-        pub fn appearanceNamed(name: &NSAppearanceName) -> Id<Self, Shared> {
-            unsafe { msg_send_id![Self::class(), appearanceNamed: name] }
-        }
+        #[method_id(appearanceNamed:)]
+        pub fn appearanceNamed(name: &NSAppearanceName) -> Id<Self>;
 
+        #[method_id(bestMatchFromAppearancesWithNames:)]
         pub fn bestMatchFromAppearancesWithNames(
             &self,
             appearances: &NSArray<NSAppearanceName>,
-        ) -> Id<NSAppearanceName, Shared> {
-            unsafe { msg_send_id![self, bestMatchFromAppearancesWithNames: appearances,] }
-        }
+        ) -> Id<NSAppearanceName>;
     }
 );
diff --git a/src/platform_impl/macos/appkit/application.rs b/src/platform_impl/macos/appkit/application.rs
index 27183423..952f49d1 100644
--- a/src/platform_impl/macos/appkit/application.rs
+++ b/src/platform_impl/macos/appkit/application.rs
@@ -1,7 +1,7 @@
-use objc2::foundation::{MainThreadMarker, NSArray, NSInteger, NSObject, NSUInteger};
-use objc2::rc::{Id, Shared};
+use icrate::Foundation::{MainThreadMarker, NSArray, NSInteger, NSObject, NSUInteger};
+use objc2::rc::Id;
 use objc2::runtime::Object;
-use objc2::{extern_class, extern_methods, msg_send_id, ClassType};
+use objc2::{extern_class, extern_methods, msg_send_id, mutability, ClassType};
 use objc2::{Encode, Encoding};
 
 use super::{NSAppearance, NSEvent, NSMenu, NSResponder, NSWindow};
@@ -13,10 +13,11 @@ extern_class!(
     unsafe impl ClassType for NSApplication {
         #[inherits(NSObject)]
         type Super = NSResponder;
+        type Mutability = mutability::InteriorMutable;
     }
 );
 
-pub(crate) fn NSApp() -> Id<NSApplication, Shared> {
+pub(crate) fn NSApp() -> Id<NSApplication> {
     // TODO: Only allow access from main thread
     NSApplication::shared(unsafe { MainThreadMarker::new_unchecked() })
 }
@@ -26,70 +27,66 @@ extern_methods!(
         /// This can only be called on the main thread since it may initialize
         /// the application and since it's parameters may be changed by the main
         /// thread at any time (hence it is only safe to access on the main thread).
-        pub fn shared(_mtm: MainThreadMarker) -> Id<Self, Shared> {
+        pub fn shared(_mtm: MainThreadMarker) -> Id<Self> {
             let app: Option<_> = unsafe { msg_send_id![Self::class(), sharedApplication] };
             // SAFETY: `sharedApplication` always initializes the app if it isn't already
             unsafe { app.unwrap_unchecked() }
         }
 
-        pub fn currentEvent(&self) -> Option<Id<NSEvent, Shared>> {
-            unsafe { msg_send_id![self, currentEvent] }
-        }
+        #[method_id(currentEvent)]
+        pub fn currentEvent(&self) -> Option<Id<NSEvent>>;
 
-        #[sel(postEvent:atStart:)]
+        #[method(postEvent:atStart:)]
         pub fn postEvent_atStart(&self, event: &NSEvent, front_of_queue: bool);
 
-        #[sel(presentationOptions)]
+        #[method(presentationOptions)]
         pub fn presentationOptions(&self) -> NSApplicationPresentationOptions;
 
-        pub fn windows(&self) -> Id<NSArray<NSWindow, Shared>, Shared> {
-            unsafe { msg_send_id![self, windows] }
-        }
+        #[method_id(windows)]
+        pub fn windows(&self) -> Id<NSArray<NSWindow>>;
 
-        pub fn keyWindow(&self) -> Option<Id<NSWindow, Shared>> {
-            unsafe { msg_send_id![self, keyWindow] }
-        }
+        #[method_id(keyWindow)]
+        pub fn keyWindow(&self) -> Option<Id<NSWindow>>;
 
         // TODO: NSApplicationDelegate
-        #[sel(setDelegate:)]
+        #[method(setDelegate:)]
         pub fn setDelegate(&self, delegate: &Object);
 
-        #[sel(setPresentationOptions:)]
+        #[method(setPresentationOptions:)]
         pub fn setPresentationOptions(&self, options: NSApplicationPresentationOptions);
 
-        #[sel(hide:)]
+        #[method(hide:)]
         pub fn hide(&self, sender: Option<&Object>);
 
-        #[sel(orderFrontCharacterPalette:)]
+        #[method(orderFrontCharacterPalette:)]
         #[allow(dead_code)]
         pub fn orderFrontCharacterPalette(&self, sender: Option<&Object>);
 
-        #[sel(hideOtherApplications:)]
+        #[method(hideOtherApplications:)]
         pub fn hideOtherApplications(&self, sender: Option<&Object>);
 
-        #[sel(stop:)]
+        #[method(stop:)]
         pub fn stop(&self, sender: Option<&Object>);
 
-        #[sel(activateIgnoringOtherApps:)]
+        #[method(activateIgnoringOtherApps:)]
         pub fn activateIgnoringOtherApps(&self, ignore: bool);
 
-        #[sel(requestUserAttention:)]
+        #[method(requestUserAttention:)]
         pub fn requestUserAttention(&self, type_: NSRequestUserAttentionType) -> NSInteger;
 
-        #[sel(setActivationPolicy:)]
+        #[method(setActivationPolicy:)]
         pub fn setActivationPolicy(&self, policy: NSApplicationActivationPolicy) -> bool;
 
-        #[sel(setMainMenu:)]
+        #[method(setMainMenu:)]
         pub fn setMainMenu(&self, menu: &NSMenu);
 
-        pub fn effectiveAppearance(&self) -> Id<NSAppearance, Shared> {
-            unsafe { msg_send_id![self, effectiveAppearance] }
-        }
+        #[method_id(effectiveAppearance)]
+        pub fn effectiveAppearance(&self) -> Id<NSAppearance>;
 
-        #[sel(setAppearance:)]
+        #[method(setAppearance:)]
         pub fn setAppearance(&self, appearance: Option<&NSAppearance>);
 
-        #[sel(run)]
+        #[method(run)]
         pub unsafe fn run(&self);
     }
 );
diff --git a/src/platform_impl/macos/appkit/button.rs b/src/platform_impl/macos/appkit/button.rs
index c4a61ca1..eb3c57a5 100644
--- a/src/platform_impl/macos/appkit/button.rs
+++ b/src/platform_impl/macos/appkit/button.rs
@@ -1,5 +1,5 @@
-use objc2::foundation::NSObject;
-use objc2::{extern_class, ClassType};
+use icrate::Foundation::NSObject;
+use objc2::{extern_class, mutability, ClassType};
 
 use super::{NSControl, NSResponder, NSView};
 
@@ -10,5 +10,6 @@ extern_class!(
     unsafe impl ClassType for NSButton {
         #[inherits(NSView, NSResponder, NSObject)]
         type Super = NSControl;
+        type Mutability = mutability::InteriorMutable;
     }
 );
diff --git a/src/platform_impl/macos/appkit/color.rs b/src/platform_impl/macos/appkit/color.rs
index 59399731..b5477a1e 100644
--- a/src/platform_impl/macos/appkit/color.rs
+++ b/src/platform_impl/macos/appkit/color.rs
@@ -1,6 +1,6 @@
-use objc2::foundation::NSObject;
-use objc2::rc::{Id, Shared};
-use objc2::{extern_class, extern_methods, msg_send_id, ClassType};
+use icrate::Foundation::NSObject;
+use objc2::rc::Id;
+use objc2::{extern_class, extern_methods, mutability, ClassType};
 
 extern_class!(
     /// An object that stores color data and sometimes opacity (alpha value).
@@ -11,6 +11,7 @@ extern_class!(
 
     unsafe impl ClassType for NSColor {
         type Super = NSObject;
+        type Mutability = mutability::InteriorMutable;
     }
 );
 
@@ -21,8 +22,7 @@ unsafe impl Sync for NSColor {}
 
 extern_methods!(
     unsafe impl NSColor {
-        pub fn clear() -> Id<Self, Shared> {
-            unsafe { msg_send_id![Self::class(), clearColor] }
-        }
+        #[method_id(clearColor)]
+        pub fn clear() -> Id<Self>;
     }
 );
diff --git a/src/platform_impl/macos/appkit/control.rs b/src/platform_impl/macos/appkit/control.rs
index 1ca52195..d38f4b10 100644
--- a/src/platform_impl/macos/appkit/control.rs
+++ b/src/platform_impl/macos/appkit/control.rs
@@ -1,5 +1,5 @@
-use objc2::foundation::NSObject;
-use objc2::{extern_class, extern_methods, ClassType};
+use icrate::Foundation::NSObject;
+use objc2::{extern_class, extern_methods, mutability, ClassType};
 
 use super::{NSResponder, NSView};
 
@@ -10,15 +10,16 @@ extern_class!(
     unsafe impl ClassType for NSControl {
         #[inherits(NSResponder, NSObject)]
         type Super = NSView;
+        type Mutability = mutability::InteriorMutable;
     }
 );
 
 extern_methods!(
     unsafe impl NSControl {
-        #[sel(setEnabled:)]
+        #[method(setEnabled:)]
         pub fn setEnabled(&self, enabled: bool);
 
-        #[sel(isEnabled)]
+        #[method(isEnabled)]
         pub fn isEnabled(&self) -> bool;
     }
 );
diff --git a/src/platform_impl/macos/appkit/cursor.rs b/src/platform_impl/macos/appkit/cursor.rs
index dd86026c..6377ad42 100644
--- a/src/platform_impl/macos/appkit/cursor.rs
+++ b/src/platform_impl/macos/appkit/cursor.rs
@@ -1,9 +1,12 @@
 use once_cell::sync::Lazy;
 
-use objc2::foundation::{NSData, NSDictionary, NSNumber, NSObject, NSPoint, NSString};
-use objc2::rc::{DefaultId, Id, Shared};
+use icrate::ns_string;
+use icrate::Foundation::{
+    NSData, NSDictionary, NSNumber, NSObject, NSObjectProtocol, NSPoint, NSString,
+};
+use objc2::rc::{DefaultId, Id};
 use objc2::runtime::Sel;
-use objc2::{extern_class, extern_methods, msg_send_id, ns_string, sel, ClassType};
+use objc2::{extern_class, extern_methods, msg_send_id, mutability, sel, ClassType};
 
 use super::NSImage;
 use crate::window::CursorIcon;
@@ -15,6 +18,7 @@ extern_class!(
 
     unsafe impl ClassType for NSCursor {
         type Super = NSObject;
+        type Mutability = mutability::InteriorMutable;
     }
 );
 
@@ -29,7 +33,7 @@ macro_rules! def_cursor {
         pub fn $name:ident();
     )*} => {$(
         $(#[$($m)*])*
-        pub fn $name() -> Id<Self, Shared> {
+        pub fn $name() -> Id<Self> {
             unsafe { msg_send_id![Self::class(), $name] }
         }
     )*};
@@ -41,7 +45,7 @@ macro_rules! def_undocumented_cursor {
         pub fn $name:ident();
     )*} => {$(
         $(#[$($m)*])*
-        pub fn $name() -> Id<Self, Shared> {
+        pub fn $name() -> Id<Self> {
             unsafe { Self::from_selector(sel!($name)).unwrap_or_else(|| Default::default()) }
         }
     )*};
@@ -71,12 +75,11 @@ extern_methods!(
         );
 
         // Creating cursors should be thread-safe, though using them for anything probably isn't.
-        pub fn new(image: &NSImage, hotSpot: NSPoint) -> Id<Self, Shared> {
-            let this = unsafe { msg_send_id![Self::class(), alloc] };
-            unsafe { msg_send_id![this, initWithImage: image, hotSpot: hotSpot] }
+        pub fn new(image: &NSImage, hotSpot: NSPoint) -> Id<Self> {
+            unsafe { msg_send_id![Self::alloc(), initWithImage: image, hotSpot: hotSpot] }
         }
 
-        pub fn invisible() -> Id<Self, Shared> {
+        pub fn invisible() -> Id<Self> {
             // 16x16 GIF data for invisible cursor
             // You can reproduce this via ImageMagick.
             // $ convert -size 16x16 xc:none cursor.gif
@@ -87,7 +90,7 @@ extern_methods!(
                 0xCB, 0xED, 0x0F, 0xA3, 0x9C, 0xB4, 0xDA, 0x8B, 0xB3, 0x3E, 0x05, 0x00, 0x3B,
             ];
 
-            static CURSOR: Lazy<Id<NSCursor, Shared>> = Lazy::new(|| {
+            static CURSOR: Lazy<Id<NSCursor>> = Lazy::new(|| {
                 // TODO: Consider using `dataWithBytesNoCopy:`
                 let data = NSData::with_bytes(CURSOR_BYTES);
                 let image = NSImage::new_with_data(&data);
@@ -100,14 +103,13 @@ extern_methods!(
 
     /// Undocumented cursors
     unsafe impl NSCursor {
-        #[sel(respondsToSelector:)]
+        #[method(respondsToSelector:)]
         fn class_responds_to(sel: Sel) -> bool;
 
-        unsafe fn from_selector_unchecked(sel: Sel) -> Id<Self, Shared> {
-            unsafe { msg_send_id![Self::class(), performSelector: sel] }
-        }
+        #[method_id(performSelector:)]
+        unsafe fn from_selector_unchecked(sel: Sel) -> Id<Self>;
 
-        unsafe fn from_selector(sel: Sel) -> Option<Id<Self, Shared>> {
+        unsafe fn from_selector(sel: Sel) -> Option<Id<Self>> {
             if Self::class_responds_to(sel) {
                 Some(unsafe { Self::from_selector_unchecked(sel) })
             } else {
@@ -143,20 +145,20 @@ extern_methods!(
     unsafe impl NSCursor {
         // Note that loading `busybutclickable` with this code won't animate
         // the frames; instead you'll just get them all in a column.
-        unsafe fn load_webkit_cursor(name: &NSString) -> Id<Self, Shared> {
+        unsafe fn load_webkit_cursor(name: &NSString) -> Id<Self> {
             // Snatch a cursor from WebKit; They fit the style of the native
             // cursors, and will seem completely standard to macOS users.
             //
             // https://stackoverflow.com/a/21786835/5435443
             let root = ns_string!("/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/HIServices.framework/Versions/A/Resources/cursors");
-            let cursor_path = root.join_path(name);
+            let cursor_path = root.stringByAppendingPathComponent(name);
 
-            let pdf_path = cursor_path.join_path(ns_string!("cursor.pdf"));
+            let pdf_path = cursor_path.stringByAppendingPathComponent(ns_string!("cursor.pdf"));
             let image = NSImage::new_by_referencing_file(&pdf_path);
 
             // TODO: Handle PLists better
-            let info_path = cursor_path.join_path(ns_string!("info.plist"));
-            let info: Id<NSDictionary<NSObject, NSObject>, Shared> = unsafe {
+            let info_path = cursor_path.stringByAppendingPathComponent(ns_string!("info.plist"));
+            let info: Id<NSDictionary<NSObject, NSObject>> = unsafe {
                 msg_send_id![
                     <NSDictionary<NSObject, NSObject>>::class(),
                     dictionaryWithContentsOfFile: &*info_path,
@@ -183,18 +185,18 @@ extern_methods!(
             Self::new(&image, hotspot)
         }
 
-        pub fn moveCursor() -> Id<Self, Shared> {
+        pub fn moveCursor() -> Id<Self> {
             unsafe { Self::load_webkit_cursor(ns_string!("move")) }
         }
 
-        pub fn cellCursor() -> Id<Self, Shared> {
+        pub fn cellCursor() -> Id<Self> {
             unsafe { Self::load_webkit_cursor(ns_string!("cell")) }
         }
     }
 );
 
 impl NSCursor {
-    pub fn from_icon(icon: CursorIcon) -> Id<Self, Shared> {
+    pub fn from_icon(icon: CursorIcon) -> Id<Self> {
         match icon {
             CursorIcon::Default => Default::default(),
             CursorIcon::Pointer => Self::pointingHandCursor(),
@@ -233,9 +235,7 @@ impl NSCursor {
 }
 
 impl DefaultId for NSCursor {
-    type Ownership = Shared;
-
-    fn default_id() -> Id<Self, Shared> {
+    fn default_id() -> Id<Self> {
         Self::arrowCursor()
     }
 }
diff --git a/src/platform_impl/macos/appkit/event.rs b/src/platform_impl/macos/appkit/event.rs
index 5952c43c..f7496399 100644
--- a/src/platform_impl/macos/appkit/event.rs
+++ b/src/platform_impl/macos/appkit/event.rs
@@ -1,11 +1,11 @@
 use std::os::raw::c_ushort;
 
-use objc2::encode::{Encode, Encoding};
-use objc2::foundation::{
+use icrate::Foundation::{
     CGFloat, NSCopying, NSInteger, NSObject, NSPoint, NSString, NSTimeInterval, NSUInteger,
 };
-use objc2::rc::{Id, Shared};
-use objc2::{extern_class, extern_methods, msg_send_id, ClassType};
+use objc2::encode::{Encode, Encoding};
+use objc2::rc::Id;
+use objc2::{extern_class, extern_methods, mutability, ClassType};
 
 extern_class!(
     #[derive(Debug, PartialEq, Eq, Hash)]
@@ -13,6 +13,7 @@ extern_class!(
 
     unsafe impl ClassType for NSEvent {
         type Super = NSObject;
+        type Mutability = mutability::InteriorMutable;
     }
 );
 
@@ -24,6 +25,17 @@ extern_class!(
 
 extern_methods!(
     unsafe impl NSEvent {
+        #[method_id(
+            otherEventWithType:
+            location:
+            modifierFlags:
+            timestamp:
+            windowNumber:
+            context:
+            subtype:
+            data1:
+            data2:
+        )]
         unsafe fn otherEventWithType(
             type_: NSEventType,
             location: NSPoint,
@@ -34,24 +46,9 @@ extern_methods!(
             subtype: NSEventSubtype,
             data1: NSInteger,
             data2: NSInteger,
-        ) -> Id<Self, Shared> {
-            unsafe {
-                msg_send_id![
-                    Self::class(),
-                    otherEventWithType: type_,
-                    location: location,
-                    modifierFlags: flags,
-                    timestamp: time,
-                    windowNumber: window_num,
-                    context: context,
-                    subtype: subtype,
-                    data1: data1,
-                    data2: data2,
-                ]
-            }
-        }
+        ) -> Id<Self>;
 
-        pub fn dummy() -> Id<Self, Shared> {
+        pub fn dummy() -> Id<Self> {
             unsafe {
                 Self::otherEventWithType(
                     NSEventType::NSApplicationDefined,
@@ -67,6 +64,18 @@ extern_methods!(
             }
         }
 
+        #[method_id(
+            keyEventWithType:
+            location:
+            modifierFlags:
+            timestamp:
+            windowNumber:
+            context:
+            characters:
+            charactersIgnoringModifiers:
+            isARepeat:
+            keyCode:
+        )]
         pub fn keyEventWithType(
             type_: NSEventType,
             location: NSPoint,
@@ -78,92 +87,74 @@ extern_methods!(
             characters_ignoring_modifiers: &NSString,
             is_a_repeat: bool,
             scancode: c_ushort,
-        ) -> Id<Self, Shared> {
-            unsafe {
-                msg_send_id![
-                    Self::class(),
-                    keyEventWithType: type_,
-                    location: location,
-                    modifierFlags: modifier_flags,
-                    timestamp: timestamp,
-                    windowNumber: window_num,
-                    context: context,
-                    characters: characters,
-                    charactersIgnoringModifiers: characters_ignoring_modifiers,
-                    isARepeat: is_a_repeat,
-                    keyCode: scancode,
-                ]
-            }
-        }
+        ) -> Id<Self>;
 
-        #[sel(locationInWindow)]
+        #[method(locationInWindow)]
         pub fn locationInWindow(&self) -> NSPoint;
 
         // TODO: MainThreadMarker
-        #[sel(pressedMouseButtons)]
+        #[method(pressedMouseButtons)]
         pub fn pressedMouseButtons() -> NSUInteger;
 
-        #[sel(modifierFlags)]
+        #[method(modifierFlags)]
         pub fn modifierFlags(&self) -> NSEventModifierFlags;
 
-        #[sel(type)]
+        #[method(type)]
         pub fn type_(&self) -> NSEventType;
 
-        #[sel(keyCode)]
+        #[method(keyCode)]
         pub fn key_code(&self) -> c_ushort;
 
-        #[sel(magnification)]
+        #[method(magnification)]
         pub fn magnification(&self) -> CGFloat;
 
-        #[sel(phase)]
+        #[method(phase)]
         pub fn phase(&self) -> NSEventPhase;
 
-        #[sel(momentumPhase)]
+        #[method(momentumPhase)]
         pub fn momentumPhase(&self) -> NSEventPhase;
 
-        #[sel(deltaX)]
+        #[method(deltaX)]
         pub fn deltaX(&self) -> CGFloat;
 
-        #[sel(deltaY)]
+        #[method(deltaY)]
         pub fn deltaY(&self) -> CGFloat;
 
-        #[sel(buttonNumber)]
+        #[method(buttonNumber)]
         pub fn buttonNumber(&self) -> NSInteger;
 
-        #[sel(scrollingDeltaX)]
+        #[method(scrollingDeltaX)]
         pub fn scrollingDeltaX(&self) -> CGFloat;
 
-        #[sel(scrollingDeltaY)]
+        #[method(scrollingDeltaY)]
         pub fn scrollingDeltaY(&self) -> CGFloat;
 
-        #[sel(hasPreciseScrollingDeltas)]
+        #[method(hasPreciseScrollingDeltas)]
         pub fn hasPreciseScrollingDeltas(&self) -> bool;
 
-        #[sel(rotation)]
+        #[method(rotation)]
         pub fn rotation(&self) -> f32;
 
-        #[sel(pressure)]
+        #[method(pressure)]
         pub fn pressure(&self) -> f32;
 
-        #[sel(stage)]
+        #[method(stage)]
         pub fn stage(&self) -> NSInteger;
 
-        #[sel(isARepeat)]
+        #[method(isARepeat)]
         pub fn is_a_repeat(&self) -> bool;
 
-        #[sel(windowNumber)]
+        #[method(windowNumber)]
         pub fn window_number(&self) -> NSInteger;
 
-        #[sel(timestamp)]
+        #[method(timestamp)]
         pub fn timestamp(&self) -> NSTimeInterval;
 
-        pub fn characters(&self) -> Option<Id<NSString, Shared>> {
-            unsafe { msg_send_id![self, characters] }
-        }
+        #[method_id(characters)]
+        pub fn characters(&self) -> Option<Id<NSString>>;
 
-        pub fn charactersIgnoringModifiers(&self) -> Option<Id<NSString, Shared>> {
-            unsafe { msg_send_id![self, charactersIgnoringModifiers] }
-        }
+        #[method_id(charactersIgnoringModifiers)]
+        pub fn charactersIgnoringModifiers(&self) -> Option<Id<NSString>>;
 
         pub fn lshift_pressed(&self) -> bool {
             let raw_modifiers = self.modifierFlags().bits() as u32;
@@ -207,10 +198,7 @@ extern_methods!(
     }
 );
 
-unsafe impl NSCopying for NSEvent {
-    type Ownership = Shared;
-    type Output = NSEvent;
-}
+unsafe impl NSCopying for NSEvent {}
 
 // The values are from the https://github.com/apple-oss-distributions/IOHIDFamily/blob/19666c840a6d896468416ff0007040a10b7b46b8/IOHIDSystem/IOKit/hidsystem/IOLLEvent.h#L258-L259
 const NX_DEVICELCTLKEYMASK: u32 = 0x00000001;
diff --git a/src/platform_impl/macos/appkit/image.rs b/src/platform_impl/macos/appkit/image.rs
index af5674d3..0b5944c3 100644
--- a/src/platform_impl/macos/appkit/image.rs
+++ b/src/platform_impl/macos/appkit/image.rs
@@ -1,6 +1,6 @@
-use objc2::foundation::{NSData, NSObject, NSString};
-use objc2::rc::{Id, Shared};
-use objc2::{extern_class, extern_methods, msg_send_id, ClassType};
+use icrate::Foundation::{NSData, NSObject, NSString};
+use objc2::rc::Id;
+use objc2::{extern_class, extern_methods, msg_send_id, mutability, ClassType};
 
 extern_class!(
     // TODO: Can this be mutable?
@@ -9,6 +9,7 @@ extern_class!(
 
     unsafe impl ClassType for NSImage {
         type Super = NSObject;
+        type Mutability = mutability::InteriorMutable;
     }
 );
 
@@ -24,14 +25,12 @@ unsafe impl Sync for NSImage {}
 
 extern_methods!(
     unsafe impl NSImage {
-        pub fn new_by_referencing_file(path: &NSString) -> Id<Self, Shared> {
-            let this = unsafe { msg_send_id![Self::class(), alloc] };
-            unsafe { msg_send_id![this, initByReferencingFile: path] }
+        pub fn new_by_referencing_file(path: &NSString) -> Id<Self> {
+            unsafe { msg_send_id![Self::alloc(), initByReferencingFile: path] }
         }
 
-        pub fn new_with_data(data: &NSData) -> Id<Self, Shared> {
-            let this = unsafe { msg_send_id![Self::class(), alloc] };
-            unsafe { msg_send_id![this, initWithData: data] }
+        pub fn new_with_data(data: &NSData) -> Id<Self> {
+            unsafe { msg_send_id![Self::alloc(), initWithData: data] }
         }
     }
 );
diff --git a/src/platform_impl/macos/appkit/menu.rs b/src/platform_impl/macos/appkit/menu.rs
index cb8b47fa..e03ec959 100644
--- a/src/platform_impl/macos/appkit/menu.rs
+++ b/src/platform_impl/macos/appkit/menu.rs
@@ -1,6 +1,6 @@
-use objc2::foundation::NSObject;
-use objc2::rc::{Id, Shared};
-use objc2::{extern_class, extern_methods, msg_send_id, ClassType};
+use icrate::Foundation::NSObject;
+use objc2::rc::Id;
+use objc2::{extern_class, extern_methods, mutability, ClassType};
 
 use super::NSMenuItem;
 
@@ -10,16 +10,16 @@ extern_class!(
 
     unsafe impl ClassType for NSMenu {
         type Super = NSObject;
+        type Mutability = mutability::InteriorMutable;
     }
 );
 
 extern_methods!(
     unsafe impl NSMenu {
-        pub fn new() -> Id<Self, Shared> {
-            unsafe { msg_send_id![Self::class(), new] }
-        }
+        #[method_id(new)]
+        pub fn new() -> Id<Self>;
 
-        #[sel(addItem:)]
+        #[method(addItem:)]
         pub fn addItem(&self, item: &NSMenuItem);
     }
 );
diff --git a/src/platform_impl/macos/appkit/menu_item.rs b/src/platform_impl/macos/appkit/menu_item.rs
index 6daed88e..63c9a501 100644
--- a/src/platform_impl/macos/appkit/menu_item.rs
+++ b/src/platform_impl/macos/appkit/menu_item.rs
@@ -1,7 +1,7 @@
-use objc2::foundation::{NSObject, NSString};
-use objc2::rc::{Id, Shared};
+use icrate::Foundation::{NSObject, NSString};
+use objc2::rc::Id;
 use objc2::runtime::Sel;
-use objc2::{extern_class, extern_methods, msg_send_id, ClassType};
+use objc2::{extern_class, extern_methods, msg_send_id, mutability, ClassType};
 
 use super::{NSEventModifierFlags, NSMenu};
 
@@ -11,23 +11,19 @@ extern_class!(
 
     unsafe impl ClassType for NSMenuItem {
         type Super = NSObject;
+        type Mutability = mutability::InteriorMutable;
     }
 );
 
 extern_methods!(
     unsafe impl NSMenuItem {
-        pub fn new() -> Id<Self, Shared> {
-            unsafe { msg_send_id![Self::class(), new] }
-        }
+        #[method_id(new)]
+        pub fn new() -> Id<Self>;
 
-        pub fn newWithTitle(
-            title: &NSString,
-            action: Sel,
-            key_equivalent: &NSString,
-        ) -> Id<Self, Shared> {
+        pub fn newWithTitle(title: &NSString, action: Sel, key_equivalent: &NSString) -> Id<Self> {
             unsafe {
                 msg_send_id![
-                    msg_send_id![Self::class(), alloc],
+                    Self::alloc(),
                     initWithTitle: title,
                     action: action,
                     keyEquivalent: key_equivalent,
@@ -35,14 +31,13 @@ extern_methods!(
             }
         }
 
-        pub fn separatorItem() -> Id<Self, Shared> {
-            unsafe { msg_send_id![Self::class(), separatorItem] }
-        }
+        #[method_id(separatorItem)]
+        pub fn separatorItem() -> Id<Self>;
 
-        #[sel(setKeyEquivalentModifierMask:)]
+        #[method(setKeyEquivalentModifierMask:)]
         pub fn setKeyEquivalentModifierMask(&self, mask: NSEventModifierFlags);
 
-        #[sel(setSubmenu:)]
+        #[method(setSubmenu:)]
         pub fn setSubmenu(&self, submenu: &NSMenu);
     }
 );
diff --git a/src/platform_impl/macos/appkit/mod.rs b/src/platform_impl/macos/appkit/mod.rs
index faebaa30..832fc149 100644
--- a/src/platform_impl/macos/appkit/mod.rs
+++ b/src/platform_impl/macos/appkit/mod.rs
@@ -25,6 +25,7 @@ mod pasteboard;
 mod responder;
 mod screen;
 mod tab_group;
+mod text_input_client;
 mod text_input_context;
 mod version;
 mod view;
@@ -51,6 +52,7 @@ pub(crate) use self::responder::NSResponder;
 #[allow(unused_imports)]
 pub(crate) use self::screen::{NSDeviceDescriptionKey, NSScreen};
 pub(crate) use self::tab_group::NSWindowTabGroup;
+pub(crate) use self::text_input_client::NSTextInputClient;
 pub(crate) use self::text_input_context::NSTextInputContext;
 pub(crate) use self::version::NSAppKitVersion;
 pub(crate) use self::view::{NSTrackingRectTag, NSView};
diff --git a/src/platform_impl/macos/appkit/pasteboard.rs b/src/platform_impl/macos/appkit/pasteboard.rs
index 6564540d..01a94089 100644
--- a/src/platform_impl/macos/appkit/pasteboard.rs
+++ b/src/platform_impl/macos/appkit/pasteboard.rs
@@ -1,6 +1,6 @@
-use objc2::foundation::{NSObject, NSString};
-use objc2::rc::{Id, Shared};
-use objc2::{extern_class, extern_methods, msg_send_id, ClassType};
+use icrate::Foundation::{NSObject, NSString};
+use objc2::rc::Id;
+use objc2::{extern_class, extern_methods, mutability, ClassType};
 
 extern_class!(
     #[derive(Debug, PartialEq, Eq, Hash)]
@@ -8,14 +8,14 @@ extern_class!(
 
     unsafe impl ClassType for NSPasteboard {
         type Super = NSObject;
+        type Mutability = mutability::InteriorMutable;
     }
 );
 
 extern_methods!(
     unsafe impl NSPasteboard {
-        pub fn propertyListForType(&self, type_: &NSPasteboardType) -> Id<NSObject, Shared> {
-            unsafe { msg_send_id![self, propertyListForType: type_] }
-        }
+        #[method_id(propertyListForType:)]
+        pub fn propertyListForType(&self, type_: &NSPasteboardType) -> Id<NSObject>;
     }
 );
 
diff --git a/src/platform_impl/macos/appkit/responder.rs b/src/platform_impl/macos/appkit/responder.rs
index 8aa49a3d..11f3bddf 100644
--- a/src/platform_impl/macos/appkit/responder.rs
+++ b/src/platform_impl/macos/appkit/responder.rs
@@ -1,15 +1,15 @@
-use objc2::foundation::{NSArray, NSObject};
-use objc2::rc::Shared;
-use objc2::{extern_class, extern_methods, ClassType};
+use icrate::Foundation::{NSArray, NSObject};
+use objc2::{extern_class, extern_methods, mutability, ClassType};
 
 use super::NSEvent;
 
 extern_class!(
     #[derive(Debug, PartialEq, Eq, Hash)]
-    pub(crate) struct NSResponder;
+    pub struct NSResponder;
 
     unsafe impl ClassType for NSResponder {
         type Super = NSObject;
+        type Mutability = mutability::InteriorMutable;
     }
 );
 
@@ -17,7 +17,7 @@ extern_class!(
 
 extern_methods!(
     unsafe impl NSResponder {
-        #[sel(interpretKeyEvents:)]
-        pub unsafe fn interpretKeyEvents(&self, events: &NSArray<NSEvent, Shared>);
+        #[method(interpretKeyEvents:)]
+        pub(crate) unsafe fn interpretKeyEvents(&self, events: &NSArray<NSEvent>);
     }
 );
diff --git a/src/platform_impl/macos/appkit/screen.rs b/src/platform_impl/macos/appkit/screen.rs
index 7eb8b2a7..8dfe570d 100644
--- a/src/platform_impl/macos/appkit/screen.rs
+++ b/src/platform_impl/macos/appkit/screen.rs
@@ -1,7 +1,8 @@
-use objc2::foundation::{CGFloat, NSArray, NSDictionary, NSNumber, NSObject, NSRect, NSString};
-use objc2::rc::{Id, Shared};
+use icrate::ns_string;
+use icrate::Foundation::{CGFloat, NSArray, NSDictionary, NSNumber, NSObject, NSRect, NSString};
+use objc2::rc::Id;
 use objc2::runtime::Object;
-use objc2::{extern_class, extern_methods, msg_send_id, ns_string, ClassType};
+use objc2::{extern_class, extern_methods, mutability, ClassType};
 
 extern_class!(
     #[derive(Debug, PartialEq, Eq, Hash)]
@@ -9,6 +10,7 @@ extern_class!(
 
     unsafe impl ClassType for NSScreen {
         type Super = NSObject;
+        type Mutability = mutability::InteriorMutable;
     }
 );
 
@@ -17,26 +19,21 @@ extern_class!(
 extern_methods!(
     unsafe impl NSScreen {
         /// The application object must have been created.
-        pub fn main() -> Option<Id<Self, Shared>> {
-            unsafe { msg_send_id![Self::class(), mainScreen] }
-        }
+        #[method_id(mainScreen)]
+        pub fn main() -> Option<Id<Self>>;
 
         /// The application object must have been created.
-        pub fn screens() -> Id<NSArray<Self, Shared>, Shared> {
-            unsafe { msg_send_id![Self::class(), screens] }
-        }
+        #[method_id(screens)]
+        pub fn screens() -> Id<NSArray<Self>>;
 
-        #[sel(frame)]
+        #[method(frame)]
         pub fn frame(&self) -> NSRect;
 
-        #[sel(visibleFrame)]
+        #[method(visibleFrame)]
         pub fn visibleFrame(&self) -> NSRect;
 
-        pub fn deviceDescription(
-            &self,
-        ) -> Id<NSDictionary<NSDeviceDescriptionKey, Object>, Shared> {
-            unsafe { msg_send_id![self, deviceDescription] }
-        }
+        #[method_id(deviceDescription)]
+        pub fn deviceDescription(&self) -> Id<NSDictionary<NSDeviceDescriptionKey, Object>>;
 
         pub fn display_id(&self) -> u32 {
             let key = ns_string!("NSScreenNumber");
@@ -60,7 +57,7 @@ extern_methods!(
             })
         }
 
-        #[sel(backingScaleFactor)]
+        #[method(backingScaleFactor)]
         pub fn backingScaleFactor(&self) -> CGFloat;
     }
 );
diff --git a/src/platform_impl/macos/appkit/tab_group.rs b/src/platform_impl/macos/appkit/tab_group.rs
index d45d2dec..8a86e3c0 100644
--- a/src/platform_impl/macos/appkit/tab_group.rs
+++ b/src/platform_impl/macos/appkit/tab_group.rs
@@ -1,6 +1,6 @@
-use objc2::foundation::{NSArray, NSObject};
-use objc2::rc::{Id, Shared};
-use objc2::{extern_class, extern_methods, msg_send_id, ClassType};
+use icrate::Foundation::{NSArray, NSObject};
+use objc2::rc::Id;
+use objc2::{extern_class, extern_methods, mutability, ClassType};
 
 use super::NSWindow;
 
@@ -10,19 +10,22 @@ extern_class!(
 
     unsafe impl ClassType for NSWindowTabGroup {
         type Super = NSObject;
+        type Mutability = mutability::InteriorMutable;
     }
 );
 
 extern_methods!(
     unsafe impl NSWindowTabGroup {
-        #[sel(selectNextTab)]
+        #[method(selectNextTab)]
         pub fn selectNextTab(&self);
-        #[sel(selectPreviousTab)]
+
+        #[method(selectPreviousTab)]
         pub fn selectPreviousTab(&self);
-        pub fn tabbedWindows(&self) -> Id<NSArray<NSWindow, Shared>, Shared> {
-            unsafe { msg_send_id![self, windows] }
-        }
-        #[sel(setSelectedWindow:)]
+
+        #[method_id(windows)]
+        pub fn tabbedWindows(&self) -> Id<NSArray<NSWindow>>;
+
+        #[method(setSelectedWindow:)]
         pub fn setSelectedWindow(&self, window: &NSWindow);
     }
 );
diff --git a/src/platform_impl/macos/appkit/text_input_client.rs b/src/platform_impl/macos/appkit/text_input_client.rs
new file mode 100644
index 00000000..12d03fcb
--- /dev/null
+++ b/src/platform_impl/macos/appkit/text_input_client.rs
@@ -0,0 +1,9 @@
+use objc2::{extern_protocol, ProtocolType};
+
+extern_protocol!(
+    pub(crate) unsafe trait NSTextInputClient {
+        // TODO: Methods
+    }
+
+    unsafe impl ProtocolType for dyn NSTextInputClient {}
+);
diff --git a/src/platform_impl/macos/appkit/text_input_context.rs b/src/platform_impl/macos/appkit/text_input_context.rs
index 79a9611b..ee720798 100644
--- a/src/platform_impl/macos/appkit/text_input_context.rs
+++ b/src/platform_impl/macos/appkit/text_input_context.rs
@@ -1,6 +1,6 @@
-use objc2::foundation::{NSObject, NSString};
-use objc2::rc::{Id, Shared};
-use objc2::{extern_class, extern_methods, msg_send_id, ClassType};
+use icrate::Foundation::{NSObject, NSString};
+use objc2::rc::Id;
+use objc2::{extern_class, extern_methods, mutability, ClassType};
 
 type NSTextInputSourceIdentifier = NSString;
 
@@ -11,21 +11,19 @@ extern_class!(
 
     unsafe impl ClassType for NSTextInputContext {
         type Super = NSObject;
+        type Mutability = mutability::InteriorMutable;
     }
 );
 
 extern_methods!(
     unsafe impl NSTextInputContext {
-        #[sel(invalidateCharacterCoordinates)]
+        #[method(invalidateCharacterCoordinates)]
         pub fn invalidateCharacterCoordinates(&self);
 
-        #[sel(discardMarkedText)]
+        #[method(discardMarkedText)]
         pub fn discardMarkedText(&self);
 
-        pub fn selectedKeyboardInputSource(
-            &self,
-        ) -> Option<Id<NSTextInputSourceIdentifier, Shared>> {
-            unsafe { msg_send_id![self, selectedKeyboardInputSource] }
-        }
+        #[method_id(selectedKeyboardInputSource)]
+        pub fn selectedKeyboardInputSource(&self) -> Option<Id<NSTextInputSourceIdentifier>>;
     }
 );
diff --git a/src/platform_impl/macos/appkit/view.rs b/src/platform_impl/macos/appkit/view.rs
index f883c3e4..049bf61f 100644
--- a/src/platform_impl/macos/appkit/view.rs
+++ b/src/platform_impl/macos/appkit/view.rs
@@ -2,10 +2,10 @@ use std::ffi::c_void;
 use std::num::NonZeroIsize;
 use std::ptr;
 
-use objc2::foundation::{NSObject, NSPoint, NSRect};
-use objc2::rc::{Id, Shared};
+use icrate::Foundation::{NSObject, NSPoint, NSRect};
+use objc2::rc::Id;
 use objc2::runtime::Object;
-use objc2::{extern_class, extern_methods, msg_send_id, ClassType};
+use objc2::{extern_class, extern_methods, mutability, ClassType};
 
 use super::{NSCursor, NSResponder, NSTextInputContext, NSWindow};
 
@@ -16,6 +16,7 @@ extern_class!(
     unsafe impl ClassType for NSView {
         #[inherits(NSObject)]
         type Super = NSResponder;
+        type Mutability = mutability::InteriorMutable;
     }
 );
 
@@ -31,47 +32,45 @@ extern_class!(
 extern_methods!(
     /// Getter methods
     unsafe impl NSView {
-        #[sel(frame)]
+        #[method(frame)]
         pub fn frame(&self) -> NSRect;
 
-        #[sel(bounds)]
+        #[method(bounds)]
         pub fn bounds(&self) -> NSRect;
 
+        #[method_id(inputContext)]
         pub fn inputContext(
             &self,
             // _mtm: MainThreadMarker,
-        ) -> Option<Id<NSTextInputContext, Shared>> {
-            unsafe { msg_send_id![self, inputContext] }
-        }
+        ) -> Option<Id<NSTextInputContext>>;
 
-        #[sel(visibleRect)]
+        #[method(visibleRect)]
         pub fn visibleRect(&self) -> NSRect;
 
-        #[sel(hasMarkedText)]
+        #[method(hasMarkedText)]
         pub fn hasMarkedText(&self) -> bool;
 
-        #[sel(convertPoint:fromView:)]
+        #[method(convertPoint:fromView:)]
         pub fn convertPoint_fromView(&self, point: NSPoint, view: Option<&NSView>) -> NSPoint;
 
-        pub fn window(&self) -> Option<Id<NSWindow, Shared>> {
-            unsafe { msg_send_id![self, window] }
-        }
+        #[method_id(window)]
+        pub fn window(&self) -> Option<Id<NSWindow>>;
     }
 
     unsafe impl NSView {
-        #[sel(setWantsBestResolutionOpenGLSurface:)]
+        #[method(setWantsBestResolutionOpenGLSurface:)]
         pub fn setWantsBestResolutionOpenGLSurface(&self, value: bool);
 
-        #[sel(setWantsLayer:)]
+        #[method(setWantsLayer:)]
         pub fn setWantsLayer(&self, wants_layer: bool);
 
-        #[sel(setPostsFrameChangedNotifications:)]
+        #[method(setPostsFrameChangedNotifications:)]
         pub fn setPostsFrameChangedNotifications(&self, value: bool);
 
-        #[sel(removeTrackingRect:)]
+        #[method(removeTrackingRect:)]
         pub fn removeTrackingRect(&self, tag: NSTrackingRectTag);
 
-        #[sel(addTrackingRect:owner:userData:assumeInside:)]
+        #[method(addTrackingRect:owner:userData:assumeInside:)]
         unsafe fn inner_addTrackingRect(
             &self,
             rect: NSRect,
@@ -86,11 +85,11 @@ extern_methods!(
                 .expect("failed creating tracking rect")
         }
 
-        #[sel(addCursorRect:cursor:)]
+        #[method(addCursorRect:cursor:)]
         // NSCursor safe to take by shared reference since it is already immutable
         pub fn addCursorRect(&self, rect: NSRect, cursor: &NSCursor);
 
-        #[sel(setHidden:)]
+        #[method(setHidden:)]
         pub fn setHidden(&self, hidden: bool);
     }
 );
diff --git a/src/platform_impl/macos/appkit/window.rs b/src/platform_impl/macos/appkit/window.rs
index 139197a5..33ad316b 100644
--- a/src/platform_impl/macos/appkit/window.rs
+++ b/src/platform_impl/macos/appkit/window.rs
@@ -1,10 +1,10 @@
-use objc2::encode::{Encode, Encoding};
-use objc2::foundation::{
+use icrate::Foundation::{
     CGFloat, NSArray, NSInteger, NSObject, NSPoint, NSRect, NSSize, NSString, NSUInteger,
 };
-use objc2::rc::{Id, Shared};
+use objc2::encode::{Encode, Encoding};
+use objc2::rc::Id;
 use objc2::runtime::Object;
-use objc2::{extern_class, extern_methods, msg_send_id, ClassType};
+use objc2::{extern_class, extern_methods, mutability, ClassType};
 
 use super::{
     NSButton, NSColor, NSEvent, NSPasteboardType, NSResponder, NSScreen, NSView, NSWindowTabGroup,
@@ -13,11 +13,12 @@ use super::{
 extern_class!(
     /// Main-Thread-Only!
     #[derive(Debug, PartialEq, Eq, Hash)]
-    pub(crate) struct NSWindow;
+    pub struct NSWindow;
 
     unsafe impl ClassType for NSWindow {
         #[inherits(NSObject)]
         type Super = NSResponder;
+        type Mutability = mutability::InteriorMutable;
     }
 );
 
@@ -32,221 +33,214 @@ extern_class!(
 
 extern_methods!(
     unsafe impl NSWindow {
-        #[sel(frame)]
-        pub fn frame(&self) -> NSRect;
+        #[method(frame)]
+        pub(crate) fn frame(&self) -> NSRect;
 
-        #[sel(backingScaleFactor)]
-        pub fn backingScaleFactor(&self) -> CGFloat;
+        #[method(backingScaleFactor)]
+        pub(crate) fn backingScaleFactor(&self) -> CGFloat;
 
-        pub fn contentView(&self) -> Id<NSView, Shared> {
-            unsafe { msg_send_id![self, contentView] }
-        }
+        #[method_id(contentView)]
+        pub(crate) fn contentView(&self) -> Id<NSView>;
 
-        #[sel(setContentView:)]
-        pub fn setContentView(&self, view: &NSView);
+        #[method(setContentView:)]
+        pub(crate) fn setContentView(&self, view: &NSView);
 
-        #[sel(setInitialFirstResponder:)]
-        pub fn setInitialFirstResponder(&self, view: &NSView);
+        #[method(setInitialFirstResponder:)]
+        pub(crate) fn setInitialFirstResponder(&self, view: &NSView);
 
-        #[sel(makeFirstResponder:)]
+        #[method(makeFirstResponder:)]
         #[must_use]
-        pub fn makeFirstResponder(&self, responder: Option<&NSResponder>) -> bool;
+        pub(crate) fn makeFirstResponder(&self, responder: Option<&NSResponder>) -> bool;
 
-        #[sel(contentRectForFrameRect:)]
-        pub fn contentRectForFrameRect(&self, windowFrame: NSRect) -> NSRect;
+        #[method(contentRectForFrameRect:)]
+        pub(crate) fn contentRectForFrameRect(&self, windowFrame: NSRect) -> NSRect;
 
-        pub fn screen(&self) -> Option<Id<NSScreen, Shared>> {
-            unsafe { msg_send_id![self, screen] }
-        }
+        #[method_id(screen)]
+        pub(crate) fn screen(&self) -> Option<Id<NSScreen>>;
 
-        #[sel(setContentSize:)]
-        pub fn setContentSize(&self, contentSize: NSSize);
+        #[method(setContentSize:)]
+        pub(crate) fn setContentSize(&self, contentSize: NSSize);
 
-        #[sel(setFrameTopLeftPoint:)]
-        pub fn setFrameTopLeftPoint(&self, point: NSPoint);
+        #[method(setFrameTopLeftPoint:)]
+        pub(crate) fn setFrameTopLeftPoint(&self, point: NSPoint);
 
-        #[sel(setMinSize:)]
-        pub fn setMinSize(&self, minSize: NSSize);
+        #[method(setMinSize:)]
+        pub(crate) fn setMinSize(&self, minSize: NSSize);
 
-        #[sel(setMaxSize:)]
-        pub fn setMaxSize(&self, maxSize: NSSize);
+        #[method(setMaxSize:)]
+        pub(crate) fn setMaxSize(&self, maxSize: NSSize);
 
-        #[sel(setResizeIncrements:)]
-        pub fn setResizeIncrements(&self, increments: NSSize);
+        #[method(setResizeIncrements:)]
+        pub(crate) fn setResizeIncrements(&self, increments: NSSize);
 
-        #[sel(contentResizeIncrements)]
-        pub fn contentResizeIncrements(&self) -> NSSize;
+        #[method(contentResizeIncrements)]
+        pub(crate) fn contentResizeIncrements(&self) -> NSSize;
 
-        #[sel(setContentResizeIncrements:)]
-        pub fn setContentResizeIncrements(&self, increments: NSSize);
+        #[method(setContentResizeIncrements:)]
+        pub(crate) fn setContentResizeIncrements(&self, increments: NSSize);
 
-        #[sel(setFrame:display:)]
-        pub fn setFrame_display(&self, frameRect: NSRect, flag: bool);
+        #[method(setFrame:display:)]
+        pub(crate) fn setFrame_display(&self, frameRect: NSRect, flag: bool);
 
-        #[sel(setMovable:)]
-        pub fn setMovable(&self, movable: bool);
+        #[method(setMovable:)]
+        pub(crate) fn setMovable(&self, movable: bool);
 
-        #[sel(setSharingType:)]
-        pub fn setSharingType(&self, sharingType: NSWindowSharingType);
+        #[method(setSharingType:)]
+        pub(crate) fn setSharingType(&self, sharingType: NSWindowSharingType);
 
-        #[sel(setTabbingMode:)]
-        pub fn setTabbingMode(&self, tabbingMode: NSWindowTabbingMode);
+        #[method(setTabbingMode:)]
+        pub(crate) fn setTabbingMode(&self, tabbingMode: NSWindowTabbingMode);
 
-        #[sel(setOpaque:)]
-        pub fn setOpaque(&self, opaque: bool);
+        #[method(setOpaque:)]
+        pub(crate) fn setOpaque(&self, opaque: bool);
 
-        #[sel(hasShadow)]
-        pub fn hasShadow(&self) -> bool;
+        #[method(hasShadow)]
+        pub(crate) fn hasShadow(&self) -> bool;
 
-        #[sel(setHasShadow:)]
-        pub fn setHasShadow(&self, has_shadow: bool);
+        #[method(setHasShadow:)]
+        pub(crate) fn setHasShadow(&self, has_shadow: bool);
 
-        #[sel(setIgnoresMouseEvents:)]
-        pub fn setIgnoresMouseEvents(&self, ignores: bool);
+        #[method(setIgnoresMouseEvents:)]
+        pub(crate) fn setIgnoresMouseEvents(&self, ignores: bool);
 
-        #[sel(setBackgroundColor:)]
-        pub fn setBackgroundColor(&self, color: &NSColor);
+        #[method(setBackgroundColor:)]
+        pub(crate) fn setBackgroundColor(&self, color: &NSColor);
 
-        #[sel(styleMask)]
-        pub fn styleMask(&self) -> NSWindowStyleMask;
+        #[method(styleMask)]
+        pub(crate) fn styleMask(&self) -> NSWindowStyleMask;
 
-        #[sel(setStyleMask:)]
-        pub fn setStyleMask(&self, mask: NSWindowStyleMask);
+        #[method(setStyleMask:)]
+        pub(crate) fn setStyleMask(&self, mask: NSWindowStyleMask);
 
-        #[sel(registerForDraggedTypes:)]
-        pub fn registerForDraggedTypes(&self, types: &NSArray<NSPasteboardType>);
+        #[method(registerForDraggedTypes:)]
+        pub(crate) fn registerForDraggedTypes(&self, types: &NSArray<NSPasteboardType>);
 
-        #[sel(makeKeyAndOrderFront:)]
-        pub fn makeKeyAndOrderFront(&self, sender: Option<&Object>);
+        #[method(makeKeyAndOrderFront:)]
+        pub(crate) fn makeKeyAndOrderFront(&self, sender: Option<&Object>);
 
-        #[sel(orderFront:)]
-        pub fn orderFront(&self, sender: Option<&Object>);
+        #[method(orderFront:)]
+        pub(crate) fn orderFront(&self, sender: Option<&Object>);
 
-        #[sel(miniaturize:)]
-        pub fn miniaturize(&self, sender: Option<&Object>);
+        #[method(miniaturize:)]
+        pub(crate) fn miniaturize(&self, sender: Option<&Object>);
 
-        #[sel(sender:)]
-        pub fn deminiaturize(&self, sender: Option<&Object>);
+        #[method(sender:)]
+        pub(crate) fn deminiaturize(&self, sender: Option<&Object>);
 
-        #[sel(toggleFullScreen:)]
-        pub fn toggleFullScreen(&self, sender: Option<&Object>);
+        #[method(toggleFullScreen:)]
+        pub(crate) fn toggleFullScreen(&self, sender: Option<&Object>);
 
-        #[sel(orderOut:)]
-        pub fn orderOut(&self, sender: Option<&Object>);
+        #[method(orderOut:)]
+        pub(crate) fn orderOut(&self, sender: Option<&Object>);
 
-        #[sel(zoom:)]
-        pub fn zoom(&self, sender: Option<&Object>);
+        #[method(zoom:)]
+        pub(crate) fn zoom(&self, sender: Option<&Object>);
 
-        #[sel(selectNextKeyView:)]
-        pub fn selectNextKeyView(&self, sender: Option<&Object>);
+        #[method(selectNextKeyView:)]
+        pub(crate) fn selectNextKeyView(&self, sender: Option<&Object>);
 
-        #[sel(selectPreviousKeyView:)]
-        pub fn selectPreviousKeyView(&self, sender: Option<&Object>);
+        #[method(selectPreviousKeyView:)]
+        pub(crate) fn selectPreviousKeyView(&self, sender: Option<&Object>);
 
-        pub fn firstResponder(&self) -> Option<Id<NSResponder, Shared>> {
-            unsafe { msg_send_id![self, firstResponder] }
-        }
+        #[method_id(firstResponder)]
+        pub(crate) fn firstResponder(&self) -> Option<Id<NSResponder>>;
 
-        pub fn standardWindowButton(&self, kind: NSWindowButton) -> Option<Id<NSButton, Shared>> {
-            unsafe { msg_send_id![self, standardWindowButton: kind] }
-        }
+        #[method_id(standardWindowButton:)]
+        pub(crate) fn standardWindowButton(&self, kind: NSWindowButton) -> Option<Id<NSButton>>;
 
-        #[sel(setTitle:)]
-        pub fn setTitle(&self, title: &NSString);
+        #[method(setTitle:)]
+        pub(crate) fn setTitle(&self, title: &NSString);
 
-        pub fn title_(&self) -> Id<NSString, Shared> {
-            unsafe { msg_send_id![self, title] }
-        }
+        #[method_id(title)]
+        pub(crate) fn title_(&self) -> Id<NSString>;
 
-        #[sel(setReleasedWhenClosed:)]
-        pub fn setReleasedWhenClosed(&self, val: bool);
+        #[method(setReleasedWhenClosed:)]
+        pub(crate) fn setReleasedWhenClosed(&self, val: bool);
 
-        #[sel(setAcceptsMouseMovedEvents:)]
-        pub fn setAcceptsMouseMovedEvents(&self, val: bool);
+        #[method(setAcceptsMouseMovedEvents:)]
+        pub(crate) fn setAcceptsMouseMovedEvents(&self, val: bool);
 
-        #[sel(setTitlebarAppearsTransparent:)]
-        pub fn setTitlebarAppearsTransparent(&self, val: bool);
+        #[method(setTitlebarAppearsTransparent:)]
+        pub(crate) fn setTitlebarAppearsTransparent(&self, val: bool);
 
-        #[sel(setTitleVisibility:)]
-        pub fn setTitleVisibility(&self, visibility: NSWindowTitleVisibility);
+        #[method(setTitleVisibility:)]
+        pub(crate) fn setTitleVisibility(&self, visibility: NSWindowTitleVisibility);
 
-        #[sel(setMovableByWindowBackground:)]
-        pub fn setMovableByWindowBackground(&self, val: bool);
+        #[method(setMovableByWindowBackground:)]
+        pub(crate) fn setMovableByWindowBackground(&self, val: bool);
 
-        #[sel(setLevel:)]
-        pub fn setLevel(&self, level: NSWindowLevel);
+        #[method(setLevel:)]
+        pub(crate) fn setLevel(&self, level: NSWindowLevel);
 
-        #[sel(setAllowsAutomaticWindowTabbing:)]
-        pub fn setAllowsAutomaticWindowTabbing(val: bool);
+        #[method(setAllowsAutomaticWindowTabbing:)]
+        pub(crate) fn setAllowsAutomaticWindowTabbing(val: bool);
 
-        #[sel(setTabbingIdentifier:)]
-        pub fn setTabbingIdentifier(&self, identifier: &NSString);
+        #[method(setTabbingIdentifier:)]
+        pub(crate) fn setTabbingIdentifier(&self, identifier: &NSString);
 
-        #[sel(setDocumentEdited:)]
-        pub fn setDocumentEdited(&self, val: bool);
+        #[method(setDocumentEdited:)]
+        pub(crate) fn setDocumentEdited(&self, val: bool);
 
-        #[sel(occlusionState)]
-        pub fn occlusionState(&self) -> NSWindowOcclusionState;
+        #[method(occlusionState)]
+        pub(crate) fn occlusionState(&self) -> NSWindowOcclusionState;
 
-        #[sel(center)]
-        pub fn center(&self);
+        #[method(center)]
+        pub(crate) fn center(&self);
 
-        #[sel(isResizable)]
-        pub fn isResizable(&self) -> bool;
+        #[method(isResizable)]
+        pub(crate) fn isResizable(&self) -> bool;
 
-        #[sel(isMiniaturizable)]
-        pub fn isMiniaturizable(&self) -> bool;
+        #[method(isMiniaturizable)]
+        pub(crate) fn isMiniaturizable(&self) -> bool;
 
-        #[sel(hasCloseBox)]
-        pub fn hasCloseBox(&self) -> bool;
+        #[method(hasCloseBox)]
+        pub(crate) fn hasCloseBox(&self) -> bool;
 
-        #[sel(isMiniaturized)]
-        pub fn isMiniaturized(&self) -> bool;
+        #[method(isMiniaturized)]
+        pub(crate) fn isMiniaturized(&self) -> bool;
 
-        #[sel(isVisible)]
-        pub fn isVisible(&self) -> bool;
+        #[method(isVisible)]
+        pub(crate) fn isVisible(&self) -> bool;
 
-        #[sel(isKeyWindow)]
-        pub fn isKeyWindow(&self) -> bool;
+        #[method(isKeyWindow)]
+        pub(crate) fn isKeyWindow(&self) -> bool;
 
-        #[sel(isZoomed)]
-        pub fn isZoomed(&self) -> bool;
+        #[method(isZoomed)]
+        pub(crate) fn isZoomed(&self) -> bool;
 
-        #[sel(allowsAutomaticWindowTabbing)]
-        pub fn allowsAutomaticWindowTabbing() -> bool;
+        #[method(allowsAutomaticWindowTabbing)]
+        pub(crate) fn allowsAutomaticWindowTabbing() -> bool;
 
-        #[sel(selectNextTab)]
-        pub fn selectNextTab(&self);
+        #[method(selectNextTab)]
+        pub(crate) fn selectNextTab(&self);
 
-        pub fn tabbingIdentifier(&self) -> Id<NSString, Shared> {
-            unsafe { msg_send_id![self, tabbingIdentifier] }
-        }
+        #[method_id(tabbingIdentifier)]
+        pub(crate) fn tabbingIdentifier(&self) -> Id<NSString>;
 
-        pub fn tabGroup(&self) -> Id<NSWindowTabGroup, Shared> {
-            unsafe { msg_send_id![self, tabGroup] }
-        }
+        #[method_id(tabGroup)]
+        pub(crate) fn tabGroup(&self) -> Id<NSWindowTabGroup>;
 
-        #[sel(isDocumentEdited)]
-        pub fn isDocumentEdited(&self) -> bool;
+        #[method(isDocumentEdited)]
+        pub(crate) fn isDocumentEdited(&self) -> bool;
 
-        #[sel(close)]
-        pub fn close(&self);
+        #[method(close)]
+        pub(crate) fn close(&self);
 
-        #[sel(performWindowDragWithEvent:)]
+        #[method(performWindowDragWithEvent:)]
         // TODO: Can this actually accept NULL?
-        pub fn performWindowDragWithEvent(&self, event: Option<&NSEvent>);
+        pub(crate) fn performWindowDragWithEvent(&self, event: Option<&NSEvent>);
 
-        #[sel(invalidateCursorRectsForView:)]
-        pub fn invalidateCursorRectsForView(&self, view: &NSView);
+        #[method(invalidateCursorRectsForView:)]
+        pub(crate) fn invalidateCursorRectsForView(&self, view: &NSView);
 
-        #[sel(setDelegate:)]
-        pub fn setDelegate(&self, delegate: Option<&NSObject>);
+        #[method(setDelegate:)]
+        pub(crate) fn setDelegate(&self, delegate: Option<&NSObject>);
 
-        #[sel(sendEvent:)]
-        pub unsafe fn sendEvent(&self, event: &NSEvent);
+        #[method(sendEvent:)]
+        pub(crate) unsafe fn sendEvent(&self, event: &NSEvent);
 
-        #[sel(addChildWindow:ordered:)]
-        pub unsafe fn addChildWindow(&self, child: &NSWindow, ordered: NSWindowOrderingMode);
+        #[method(addChildWindow:ordered:)]
+        pub(crate) unsafe fn addChildWindow(&self, child: &NSWindow, ordered: NSWindowOrderingMode);
     }
 );
 
diff --git a/src/platform_impl/macos/event.rs b/src/platform_impl/macos/event.rs
index 785647e3..867b9482 100644
--- a/src/platform_impl/macos/event.rs
+++ b/src/platform_impl/macos/event.rs
@@ -4,7 +4,7 @@ use core_foundation::{
     base::CFRelease,
     data::{CFDataGetBytePtr, CFDataRef},
 };
-use objc2::rc::{Id, Shared};
+use objc2::rc::Id;
 use smol_str::SmolStr;
 
 use super::appkit::{NSEvent, NSEventModifierFlags};
@@ -31,7 +31,7 @@ pub(crate) enum EventWrapper {
 #[derive(Debug)]
 pub(crate) enum EventProxy {
     DpiChangedProxy {
-        window: Id<WinitWindow, Shared>,
+        window: Id<WinitWindow>,
         suggested_size: LogicalSize<f64>,
         scale_factor: f64,
     },
diff --git a/src/platform_impl/macos/event_loop.rs b/src/platform_impl/macos/event_loop.rs
index 176c90e7..8726cf76 100644
--- a/src/platform_impl/macos/event_loop.rs
+++ b/src/platform_impl/macos/event_loop.rs
@@ -17,8 +17,8 @@ use core_foundation::runloop::{
     kCFRunLoopCommonModes, CFRunLoopAddSource, CFRunLoopGetMain, CFRunLoopSourceContext,
     CFRunLoopSourceCreate, CFRunLoopSourceRef, CFRunLoopSourceSignal, CFRunLoopWakeUp,
 };
-use objc2::foundation::is_main_thread;
-use objc2::rc::{autoreleasepool, Id, Shared};
+use icrate::Foundation::is_main_thread;
+use objc2::rc::{autoreleasepool, Id};
 use objc2::{msg_send_id, ClassType};
 use raw_window_handle::{AppKitDisplayHandle, RawDisplayHandle};
 
@@ -116,7 +116,7 @@ impl<T> EventLoopWindowTarget<T> {
 pub struct EventLoop<T: 'static> {
     /// The delegate is only weakly referenced by NSApplication, so we keep
     /// it around here as well.
-    _delegate: Id<ApplicationDelegate, Shared>,
+    _delegate: Id<ApplicationDelegate>,
 
     window_target: Rc<RootWindowTarget<T>>,
     panic_info: Rc<PanicInfo>,
@@ -157,7 +157,7 @@ impl<T> EventLoop<T> {
         // `sharedApplication`) is called anywhere else, or we'll end up
         // with the wrong `NSApplication` class and the wrong thread could
         // be marked as main.
-        let app: Id<WinitApplication, Shared> =
+        let app: Id<WinitApplication> =
             unsafe { msg_send_id![WinitApplication::class(), sharedApplication] };
 
         use NSApplicationActivationPolicy::*;
diff --git a/src/platform_impl/macos/menu.rs b/src/platform_impl/macos/menu.rs
index f7ad2df0..8e69cbbb 100644
--- a/src/platform_impl/macos/menu.rs
+++ b/src/platform_impl/macos/menu.rs
@@ -1,7 +1,8 @@
-use objc2::foundation::{NSProcessInfo, NSString};
-use objc2::rc::{Id, Shared};
+use icrate::ns_string;
+use icrate::Foundation::{NSProcessInfo, NSString};
+use objc2::rc::Id;
 use objc2::runtime::Sel;
-use objc2::{ns_string, sel};
+use objc2::sel;
 
 use super::appkit::{NSApp, NSEventModifierFlags, NSMenu, NSMenuItem};
 
@@ -16,17 +17,17 @@ pub fn initialize() {
     menubar.addItem(&app_menu_item);
 
     let app_menu = NSMenu::new();
-    let process_name = NSProcessInfo::process_info().process_name();
+    let process_name = NSProcessInfo::processInfo().processName();
 
     // About menu item
-    let about_item_title = ns_string!("About ").concat(&process_name);
+    let about_item_title = ns_string!("About ").stringByAppendingString(&process_name);
     let about_item = menu_item(&about_item_title, sel!(orderFrontStandardAboutPanel:), None);
 
     // Seperator menu item
     let sep_first = NSMenuItem::separatorItem();
 
     // Hide application menu item
-    let hide_item_title = ns_string!("Hide ").concat(&process_name);
+    let hide_item_title = ns_string!("Hide ").stringByAppendingString(&process_name);
     let hide_item = menu_item(
         &hide_item_title,
         sel!(hide:),
@@ -57,7 +58,7 @@ pub fn initialize() {
     let sep = NSMenuItem::separatorItem();
 
     // Quit application menu item
-    let quit_item_title = ns_string!("Quit ").concat(&process_name);
+    let quit_item_title = ns_string!("Quit ").stringByAppendingString(&process_name);
     let quit_item = menu_item(
         &quit_item_title,
         sel!(terminate:),
@@ -84,7 +85,7 @@ fn menu_item(
     title: &NSString,
     selector: Sel,
     key_equivalent: Option<KeyEquivalent<'_>>,
-) -> Id<NSMenuItem, Shared> {
+) -> Id<NSMenuItem> {
     let (key, masks) = match key_equivalent {
         Some(ke) => (ke.key, ke.masks),
         None => (ns_string!(""), None),
diff --git a/src/platform_impl/macos/mod.rs b/src/platform_impl/macos/mod.rs
index 141f03e6..c12f7281 100644
--- a/src/platform_impl/macos/mod.rs
+++ b/src/platform_impl/macos/mod.rs
@@ -32,7 +32,7 @@ pub(crate) use self::{
 use crate::{
     error::OsError as RootOsError, event::DeviceId as RootDeviceId, window::WindowAttributes,
 };
-use objc2::rc::{autoreleasepool, Id, Shared};
+use objc2::rc::{autoreleasepool, Id};
 
 pub(crate) use crate::icon::NoIcon as PlatformIcon;
 pub(crate) use crate::platform_impl::Fullscreen;
@@ -50,9 +50,9 @@ impl DeviceId {
 pub(crate) const DEVICE_ID: RootDeviceId = RootDeviceId(DeviceId);
 
 pub(crate) struct Window {
-    pub(crate) window: Id<WinitWindow, Shared>,
+    pub(crate) window: Id<WinitWindow>,
     // We keep this around so that it doesn't get dropped until the window does.
-    _delegate: Id<WinitWindowDelegate, Shared>,
+    _delegate: Id<WinitWindowDelegate>,
 }
 
 impl Drop for Window {
diff --git a/src/platform_impl/macos/monitor.rs b/src/platform_impl/macos/monitor.rs
index 54a99040..bc9992d4 100644
--- a/src/platform_impl/macos/monitor.rs
+++ b/src/platform_impl/macos/monitor.rs
@@ -8,7 +8,7 @@ use core_foundation::{
     string::CFString,
 };
 use core_graphics::display::{CGDirectDisplayID, CGDisplay, CGDisplayBounds};
-use objc2::rc::{Id, Shared};
+use objc2::rc::Id;
 
 use super::appkit::NSScreen;
 use super::ffi;
@@ -295,19 +295,14 @@ impl MonitorHandle {
         }
     }
 
-    pub(crate) fn ns_screen(&self) -> Option<Id<NSScreen, Shared>> {
+    pub(crate) fn ns_screen(&self) -> Option<Id<NSScreen>> {
         let uuid = unsafe { ffi::CGDisplayCreateUUIDFromDisplayID(self.0) };
-        NSScreen::screens()
-            .into_iter()
-            .find(|screen| {
-                let other_native_id = screen.display_id();
-                let other_uuid = unsafe {
-                    ffi::CGDisplayCreateUUIDFromDisplayID(other_native_id as CGDirectDisplayID)
-                };
-                uuid == other_uuid
-            })
-            .map(|screen| unsafe {
-                Id::retain(screen as *const NSScreen as *mut NSScreen).unwrap()
-            })
+        NSScreen::screens().into_iter().find(|screen| {
+            let other_native_id = screen.display_id();
+            let other_uuid = unsafe {
+                ffi::CGDisplayCreateUUIDFromDisplayID(other_native_id as CGDirectDisplayID)
+            };
+            uuid == other_uuid
+        })
     }
 }
diff --git a/src/platform_impl/macos/util/async.rs b/src/platform_impl/macos/util/async.rs
index 494e2b6c..6f430361 100644
--- a/src/platform_impl/macos/util/async.rs
+++ b/src/platform_impl/macos/util/async.rs
@@ -1,7 +1,7 @@
 use std::ops::Deref;
 
 use dispatch::Queue;
-use objc2::foundation::{is_main_thread, CGFloat, NSPoint, NSSize, NSString};
+use icrate::Foundation::{is_main_thread, CGFloat, NSPoint, NSSize, NSString};
 use objc2::rc::autoreleasepool;
 
 use crate::{
diff --git a/src/platform_impl/macos/util/mod.rs b/src/platform_impl/macos/util/mod.rs
index 2cfdc47e..bca2643e 100644
--- a/src/platform_impl/macos/util/mod.rs
+++ b/src/platform_impl/macos/util/mod.rs
@@ -5,7 +5,7 @@ mod r#async;
 pub(crate) use self::r#async::*;
 
 use core_graphics::display::CGDisplay;
-use objc2::foundation::{CGFloat, NSNotFound, NSPoint, NSRange, NSRect, NSUInteger};
+use icrate::Foundation::{CGFloat, NSNotFound, NSPoint, NSRange, NSRect, NSUInteger};
 
 use crate::dpi::LogicalPosition;
 
diff --git a/src/platform_impl/macos/view.rs b/src/platform_impl/macos/view.rs
index d1fd18ce..391089ea 100644
--- a/src/platform_impl/macos/view.rs
+++ b/src/platform_impl/macos/view.rs
@@ -1,23 +1,23 @@
 #![allow(clippy::unnecessary_cast)]
-
 use std::boxed::Box;
 use std::cell::{Cell, RefCell};
 use std::collections::{HashMap, VecDeque};
-use std::os::raw::*;
-use std::ptr::{self, NonNull};
-use std::str;
+use std::ptr::NonNull;
 
-use objc2::declare::{Ivar, IvarDrop};
-use objc2::foundation::{
+use icrate::Foundation::{
     NSArray, NSAttributedString, NSAttributedStringKey, NSCopying, NSMutableAttributedString,
-    NSObject, NSPoint, NSRange, NSRect, NSSize, NSString, NSUInteger,
+    NSObject, NSObjectProtocol, NSPoint, NSRange, NSRect, NSSize, NSString, NSUInteger,
 };
-use objc2::rc::{Id, Owned, Shared, WeakId};
+use objc2::declare::{Ivar, IvarDrop};
+use objc2::rc::{Id, WeakId};
 use objc2::runtime::{Object, Sel};
-use objc2::{class, declare_class, msg_send, msg_send_id, sel, ClassType};
+use objc2::{class, declare_class, msg_send, msg_send_id, mutability, sel, ClassType};
 
 use super::{
-    appkit::{NSApp, NSCursor, NSEvent, NSEventPhase, NSResponder, NSTrackingRectTag, NSView},
+    appkit::{
+        NSApp, NSCursor, NSEvent, NSEventPhase, NSResponder, NSTextInputClient, NSTrackingRectTag,
+        NSView,
+    },
     event::{code_to_key, code_to_location},
 };
 use crate::{
@@ -42,7 +42,7 @@ use crate::{
 #[derive(Debug)]
 struct CursorState {
     visible: bool,
-    cursor: Id<NSCursor, Shared>,
+    cursor: Id<NSCursor>,
 }
 
 impl Default for CursorState {
@@ -119,7 +119,7 @@ fn get_left_modifier_code(key: &Key) -> KeyCode {
 }
 
 #[derive(Debug, Default)]
-struct ViewState {
+pub struct ViewState {
     cursor_state: RefCell<CursorState>,
     ime_position: Cell<LogicalPosition<f64>>,
     ime_size: Cell<LogicalSize<f64>>,
@@ -138,7 +138,7 @@ struct ViewState {
     /// to the application, even during IME
     forward_key_to_app: Cell<bool>,
 
-    marked_text: RefCell<Id<NSMutableAttributedString, Owned>>,
+    marked_text: RefCell<Id<NSMutableAttributedString>>,
     accepts_first_mouse: bool,
 }
 
@@ -147,23 +147,27 @@ declare_class!(
     #[allow(non_snake_case)]
     pub(super) struct WinitView {
         // Weak reference because the window keeps a strong reference to the view
-        _ns_window: IvarDrop<Box<WeakId<WinitWindow>>>,
-        state: IvarDrop<Box<ViewState>>,
+        _ns_window: IvarDrop<Box<WeakId<WinitWindow>>, "__ns_window">,
+        state: IvarDrop<Box<ViewState>, "_state">,
     }
 
+    mod ivars;
+
     unsafe impl ClassType for WinitView {
         #[inherits(NSResponder, NSObject)]
         type Super = NSView;
+        type Mutability = mutability::InteriorMutable;
+        const NAME: &'static str = "WinitView";
     }
 
     unsafe impl WinitView {
-        #[sel(initWithId:acceptsFirstMouse:)]
+        #[method(initWithId:acceptsFirstMouse:)]
         unsafe fn init_with_id(
-            &mut self,
+            this: *mut Self,
             window: &WinitWindow,
             accepts_first_mouse: bool,
         ) -> Option<NonNull<Self>> {
-            let this: Option<&mut Self> = unsafe { msg_send![super(self), init] };
+            let this: Option<&mut Self> = unsafe { msg_send![super(this), init] };
             this.map(|this| {
                 let state = ViewState {
                     accepts_first_mouse,
@@ -201,7 +205,7 @@ declare_class!(
     }
 
     unsafe impl WinitView {
-        #[sel(viewDidMoveToWindow)]
+        #[method(viewDidMoveToWindow)]
         fn view_did_move_to_window(&self) {
             trace_scope!("viewDidMoveToWindow");
             if let Some(tracking_rect) = self.state.tracking_rect.take() {
@@ -213,7 +217,7 @@ declare_class!(
             self.state.tracking_rect.set(Some(tracking_rect));
         }
 
-        #[sel(frameDidChange:)]
+        #[method(frameDidChange:)]
         fn frame_did_change(&self, _event: &NSEvent) {
             trace_scope!("frameDidChange:");
             if let Some(tracking_rect) = self.state.tracking_rect.take() {
@@ -232,7 +236,7 @@ declare_class!(
             self.queue_event(WindowEvent::Resized(size));
         }
 
-        #[sel(drawRect:)]
+        #[method(drawRect:)]
         fn draw_rect(&self, rect: NSRect) {
             trace_scope!("drawRect:");
 
@@ -247,7 +251,7 @@ declare_class!(
             }
         }
 
-        #[sel(acceptsFirstResponder)]
+        #[method(acceptsFirstResponder)]
         fn accepts_first_responder(&self) -> bool {
             trace_scope!("acceptsFirstResponder");
             true
@@ -256,13 +260,13 @@ declare_class!(
         // This is necessary to prevent a beefy terminal error on MacBook Pros:
         // IMKInputSession [0x7fc573576ff0 presentFunctionRowItemTextInputViewWithEndpoint:completionHandler:] : [self textInputContext]=0x7fc573558e10 *NO* NSRemoteViewController to client, NSError=Error Domain=NSCocoaErrorDomain Code=4099 "The connection from pid 0 was invalidated from this process." UserInfo={NSDebugDescription=The connection from pid 0 was invalidated from this process.}, com.apple.inputmethod.EmojiFunctionRowItem
         // TODO: Add an API extension for using `NSTouchBar`
-        #[sel(touchBar)]
-        fn touch_bar(&self) -> bool {
+        #[method_id(touchBar)]
+        fn touch_bar(&self) -> Option<Id<NSObject>> {
             trace_scope!("touchBar");
-            false
+            None
         }
 
-        #[sel(resetCursorRects)]
+        #[method(resetCursorRects)]
         fn reset_cursor_rects(&self) {
             trace_scope!("resetCursorRects");
             let bounds = self.bounds();
@@ -276,17 +280,17 @@ declare_class!(
         }
     }
 
-    unsafe impl Protocol<NSTextInputClient> for WinitView {
-        #[sel(hasMarkedText)]
+    unsafe impl NSTextInputClient for WinitView {
+        #[method(hasMarkedText)]
         fn has_marked_text(&self) -> bool {
             trace_scope!("hasMarkedText");
-            self.state.marked_text.borrow().len_utf16() > 0
+            self.state.marked_text.borrow().length() > 0
         }
 
-        #[sel(markedRange)]
+        #[method(markedRange)]
         fn marked_range(&self) -> NSRange {
             trace_scope!("markedRange");
-            let length = self.state.marked_text.borrow().len_utf16();
+            let length = self.state.marked_text.borrow().length();
             if length > 0 {
                 NSRange::new(0, length)
             } else {
@@ -294,13 +298,13 @@ declare_class!(
             }
         }
 
-        #[sel(selectedRange)]
+        #[method(selectedRange)]
         fn selected_range(&self) -> NSRange {
             trace_scope!("selectedRange");
             util::EMPTY_RANGE
         }
 
-        #[sel(setMarkedText:selectedRange:replacementRange:)]
+        #[method(setMarkedText:selectedRange:replacementRange:)]
         fn set_marked_text(
             &self,
             string: &NSObject,
@@ -356,7 +360,7 @@ declare_class!(
             self.queue_event(WindowEvent::Ime(Ime::Preedit(preedit_string, cursor_range)));
         }
 
-        #[sel(unmarkText)]
+        #[method(unmarkText)]
         fn unmark_text(&self) {
             trace_scope!("unmarkText");
             *self.state.marked_text.borrow_mut() = NSMutableAttributedString::new();
@@ -373,33 +377,33 @@ declare_class!(
             }
         }
 
-        #[sel(validAttributesForMarkedText)]
-        fn valid_attributes_for_marked_text(&self) -> *const NSArray<NSAttributedStringKey> {
+        #[method_id(validAttributesForMarkedText)]
+        fn valid_attributes_for_marked_text(&self) -> Id<NSArray<NSAttributedStringKey>> {
             trace_scope!("validAttributesForMarkedText");
-            Id::autorelease_return(NSArray::new())
+            NSArray::new()
         }
 
-        #[sel(attributedSubstringForProposedRange:actualRange:)]
+        #[method_id(attributedSubstringForProposedRange:actualRange:)]
         fn attributed_substring_for_proposed_range(
             &self,
             _range: NSRange,
-            _actual_range: *mut c_void, // *mut NSRange
-        ) -> *const NSAttributedString {
+            _actual_range: *mut NSRange,
+        ) -> Option<Id<NSAttributedString>> {
             trace_scope!("attributedSubstringForProposedRange:actualRange:");
-            ptr::null()
+            None
         }
 
-        #[sel(characterIndexForPoint:)]
+        #[method(characterIndexForPoint:)]
         fn character_index_for_point(&self, _point: NSPoint) -> NSUInteger {
             trace_scope!("characterIndexForPoint:");
             0
         }
 
-        #[sel(firstRectForCharacterRange:actualRange:)]
+        #[method(firstRectForCharacterRange:actualRange:)]
         fn first_rect_for_character_range(
             &self,
             _range: NSRange,
-            _actual_range: *mut c_void, // *mut NSRange
+            _actual_range: *mut NSRange,
         ) -> NSRect {
             trace_scope!("firstRectForCharacterRange:actualRange:");
             let window = self.window();
@@ -412,7 +416,7 @@ declare_class!(
             NSRect::new(NSPoint::new(x as _, y as _), NSSize::new(width, height))
         }
 
-        #[sel(insertText:replacementRange:)]
+        #[method(insertText:replacementRange:)]
         fn insert_text(&self, string: &NSObject, _replacement_range: NSRange) {
             trace_scope!("insertText:replacementRange:");
 
@@ -439,7 +443,7 @@ declare_class!(
 
         // Basically, we're sent this message whenever a keyboard event that doesn't generate a "human
         // readable" character happens, i.e. newlines, tabs, and Ctrl+C.
-        #[sel(doCommandBySelector:)]
+        #[method(doCommandBySelector:)]
         fn do_command_by_selector(&self, _command: Sel) {
             trace_scope!("doCommandBySelector:");
             // We shouldn't forward any character from just commited text, since we'll end up sending
@@ -459,7 +463,7 @@ declare_class!(
     }
 
     unsafe impl WinitView {
-        #[sel(keyDown:)]
+        #[method(keyDown:)]
         fn key_down(&self, event: &NSEvent) {
             trace_scope!("keyDown:");
             {
@@ -485,7 +489,7 @@ declare_class!(
             // `doCommandBySelector`. (doCommandBySelector means that the keyboard input
             // is not handled by IME and should be handled by the application)
             if self.state.ime_allowed.get() {
-                let events_for_nsview = NSArray::from_slice(&[event.copy()]);
+                let events_for_nsview = NSArray::from_slice(&[&*event]);
                 unsafe { self.interpretKeyEvents(&events_for_nsview) };
 
                 // If the text was commited we must treat the next keyboard event as IME related.
@@ -518,7 +522,7 @@ declare_class!(
             }
         }
 
-        #[sel(keyUp:)]
+        #[method(keyUp:)]
         fn key_up(&self, event: &NSEvent) {
             trace_scope!("keyUp:");
 
@@ -538,15 +542,15 @@ declare_class!(
             }
         }
 
-        #[sel(flagsChanged:)]
-        fn flags_changed(&self, ns_event: &NSEvent) {
+        #[method(flagsChanged:)]
+        fn flags_changed(&self, event: &NSEvent) {
             trace_scope!("flagsChanged:");
 
-            self.update_modifiers(ns_event, true);
+            self.update_modifiers(event, true);
         }
 
-        #[sel(insertTab:)]
-        fn insert_tab(&self, _sender: *const Object) {
+        #[method(insertTab:)]
+        fn insert_tab(&self, _sender: Option<&Object>) {
             trace_scope!("insertTab:");
             let window = self.window();
             if let Some(first_responder) = window.firstResponder() {
@@ -556,8 +560,8 @@ declare_class!(
             }
         }
 
-        #[sel(insertBackTab:)]
-        fn insert_back_tab(&self, _sender: *const Object) {
+        #[method(insertBackTab:)]
+        fn insert_back_tab(&self, _sender: Option<&Object>) {
             trace_scope!("insertBackTab:");
             let window = self.window();
             if let Some(first_responder) = window.firstResponder() {
@@ -569,8 +573,8 @@ declare_class!(
 
         // Allows us to receive Cmd-. (the shortcut for closing a dialog)
         // https://bugs.eclipse.org/bugs/show_bug.cgi?id=300620#c6
-        #[sel(cancelOperation:)]
-        fn cancel_operation(&self, _sender: *const Object) {
+        #[method(cancelOperation:)]
+        fn cancel_operation(&self, _sender: Option<&Object>) {
             trace_scope!("cancelOperation:");
 
             let event = NSApp()
@@ -587,42 +591,42 @@ declare_class!(
             });
         }
 
-        #[sel(mouseDown:)]
+        #[method(mouseDown:)]
         fn mouse_down(&self, event: &NSEvent) {
             trace_scope!("mouseDown:");
             self.mouse_motion(event);
             self.mouse_click(event, ElementState::Pressed);
         }
 
-        #[sel(mouseUp:)]
+        #[method(mouseUp:)]
         fn mouse_up(&self, event: &NSEvent) {
             trace_scope!("mouseUp:");
             self.mouse_motion(event);
             self.mouse_click(event, ElementState::Released);
         }
 
-        #[sel(rightMouseDown:)]
+        #[method(rightMouseDown:)]
         fn right_mouse_down(&self, event: &NSEvent) {
             trace_scope!("rightMouseDown:");
             self.mouse_motion(event);
             self.mouse_click(event, ElementState::Pressed);
         }
 
-        #[sel(rightMouseUp:)]
+        #[method(rightMouseUp:)]
         fn right_mouse_up(&self, event: &NSEvent) {
             trace_scope!("rightMouseUp:");
             self.mouse_motion(event);
             self.mouse_click(event, ElementState::Released);
         }
 
-        #[sel(otherMouseDown:)]
+        #[method(otherMouseDown:)]
         fn other_mouse_down(&self, event: &NSEvent) {
             trace_scope!("otherMouseDown:");
             self.mouse_motion(event);
             self.mouse_click(event, ElementState::Pressed);
         }
 
-        #[sel(otherMouseUp:)]
+        #[method(otherMouseUp:)]
         fn other_mouse_up(&self, event: &NSEvent) {
             trace_scope!("otherMouseUp:");
             self.mouse_motion(event);
@@ -631,27 +635,27 @@ declare_class!(
 
         // No tracing on these because that would be overly verbose
 
-        #[sel(mouseMoved:)]
+        #[method(mouseMoved:)]
         fn mouse_moved(&self, event: &NSEvent) {
             self.mouse_motion(event);
         }
 
-        #[sel(mouseDragged:)]
+        #[method(mouseDragged:)]
         fn mouse_dragged(&self, event: &NSEvent) {
             self.mouse_motion(event);
         }
 
-        #[sel(rightMouseDragged:)]
+        #[method(rightMouseDragged:)]
         fn right_mouse_dragged(&self, event: &NSEvent) {
             self.mouse_motion(event);
         }
 
-        #[sel(otherMouseDragged:)]
+        #[method(otherMouseDragged:)]
         fn other_mouse_dragged(&self, event: &NSEvent) {
             self.mouse_motion(event);
         }
 
-        #[sel(mouseEntered:)]
+        #[method(mouseEntered:)]
         fn mouse_entered(&self, _event: &NSEvent) {
             trace_scope!("mouseEntered:");
             self.queue_event(WindowEvent::CursorEntered {
@@ -659,7 +663,7 @@ declare_class!(
             });
         }
 
-        #[sel(mouseExited:)]
+        #[method(mouseExited:)]
         fn mouse_exited(&self, _event: &NSEvent) {
             trace_scope!("mouseExited:");
 
@@ -668,7 +672,7 @@ declare_class!(
             });
         }
 
-        #[sel(scrollWheel:)]
+        #[method(scrollWheel:)]
         fn scroll_wheel(&self, event: &NSEvent) {
             trace_scope!("scrollWheel:");
 
@@ -716,7 +720,7 @@ declare_class!(
             });
         }
 
-        #[sel(magnifyWithEvent:)]
+        #[method(magnifyWithEvent:)]
         fn magnify_with_event(&self, event: &NSEvent) {
             trace_scope!("magnifyWithEvent:");
 
@@ -735,7 +739,7 @@ declare_class!(
             });
         }
 
-        #[sel(smartMagnifyWithEvent:)]
+        #[method(smartMagnifyWithEvent:)]
         fn smart_magnify_with_event(&self, _event: &NSEvent) {
             trace_scope!("smartMagnifyWithEvent:");
 
@@ -744,7 +748,7 @@ declare_class!(
             });
         }
 
-        #[sel(rotateWithEvent:)]
+        #[method(rotateWithEvent:)]
         fn rotate_with_event(&self, event: &NSEvent) {
             trace_scope!("rotateWithEvent:");
 
@@ -763,7 +767,7 @@ declare_class!(
             });
         }
 
-        #[sel(pressureChangeWithEvent:)]
+        #[method(pressureChangeWithEvent:)]
         fn pressure_change_with_event(&self, event: &NSEvent) {
             trace_scope!("pressureChangeWithEvent:");
 
@@ -779,13 +783,13 @@ declare_class!(
         // Allows us to receive Ctrl-Tab and Ctrl-Esc.
         // Note that this *doesn't* help with any missing Cmd inputs.
         // https://github.com/chromium/chromium/blob/a86a8a6bcfa438fa3ac2eba6f02b3ad1f8e0756f/ui/views/cocoa/bridged_content_view.mm#L816
-        #[sel(_wantsKeyDownForEvent:)]
+        #[method(_wantsKeyDownForEvent:)]
         fn wants_key_down_for_event(&self, _event: &NSEvent) -> bool {
             trace_scope!("_wantsKeyDownForEvent:");
             true
         }
 
-        #[sel(acceptsFirstMouse:)]
+        #[method(acceptsFirstMouse:)]
         fn accepts_first_mouse(&self, _event: &NSEvent) -> bool {
             trace_scope!("acceptsFirstMouse:");
             self.state.accepts_first_mouse
@@ -794,17 +798,17 @@ declare_class!(
 );
 
 impl WinitView {
-    pub(super) fn new(window: &WinitWindow, accepts_first_mouse: bool) -> Id<Self, Shared> {
+    pub(super) fn new(window: &WinitWindow, accepts_first_mouse: bool) -> Id<Self> {
         unsafe {
             msg_send_id![
-                msg_send_id![Self::class(), alloc],
+                Self::alloc(),
                 initWithId: window,
                 acceptsFirstMouse: accepts_first_mouse,
             ]
         }
     }
 
-    fn window(&self) -> Id<WinitWindow, Shared> {
+    fn window(&self) -> Id<WinitWindow> {
         // TODO: Simply use `window` property on `NSView`.
         // That only returns a window _after_ the view has been attached though!
         // (which is incompatible with `frameDidChange:`)
@@ -849,7 +853,7 @@ impl WinitView {
             .unwrap_or_else(String::new)
     }
 
-    pub(super) fn set_cursor_icon(&self, icon: Id<NSCursor, Shared>) {
+    pub(super) fn set_cursor_icon(&self, icon: Id<NSCursor>) {
         let mut cursor_state = self.state.cursor_state.borrow_mut();
         cursor_state.cursor = icon;
     }
@@ -1072,7 +1076,7 @@ fn mouse_button(event: &NSEvent) -> MouseButton {
 // NOTE: to get option as alt working we need to rewrite events
 // we're getting from the operating system, which makes it
 // impossible to provide such events as extra in `KeyEvent`.
-fn replace_event(event: &NSEvent, option_as_alt: OptionAsAlt) -> Id<NSEvent, Shared> {
+fn replace_event(event: &NSEvent, option_as_alt: OptionAsAlt) -> Id<NSEvent> {
     let ev_mods = event_mods(event).state;
     let ignore_alt_characters = match option_as_alt {
         OptionAsAlt::OnlyLeft if event.lalt_pressed() => true,
diff --git a/src/platform_impl/macos/window.rs b/src/platform_impl/macos/window.rs
index 86d7cee9..f174753a 100644
--- a/src/platform_impl/macos/window.rs
+++ b/src/platform_impl/macos/window.rs
@@ -35,13 +35,13 @@ use crate::{
     },
 };
 use core_graphics::display::{CGDisplay, CGPoint};
-use objc2::declare::{Ivar, IvarDrop};
-use objc2::foundation::{
+use icrate::Foundation::{
     is_main_thread, CGFloat, NSArray, NSCopying, NSInteger, NSObject, NSPoint, NSRect, NSSize,
     NSString,
 };
-use objc2::rc::{autoreleasepool, Id, Shared};
-use objc2::{declare_class, msg_send, msg_send_id, sel, ClassType};
+use objc2::declare::{Ivar, IvarDrop};
+use objc2::rc::{autoreleasepool, Id};
+use objc2::{declare_class, msg_send, msg_send_id, mutability, sel, ClassType};
 
 use super::appkit::{
     NSApp, NSAppKitVersion, NSAppearance, NSApplicationPresentationOptions, NSBackingStoreType,
@@ -107,27 +107,31 @@ impl Default for PlatformSpecificWindowBuilderAttributes {
 
 declare_class!(
     #[derive(Debug)]
-    pub(crate) struct WinitWindow {
+    pub struct WinitWindow {
         // TODO: Fix unnecessary boxing here
-        shared_state: IvarDrop<Box<Mutex<SharedState>>>,
+        shared_state: IvarDrop<Box<Mutex<SharedState>>, "_shared_state">,
     }
 
+    mod ivars;
+
     unsafe impl ClassType for WinitWindow {
         #[inherits(NSResponder, NSObject)]
         type Super = NSWindow;
+        type Mutability = mutability::InteriorMutable;
+        const NAME: &'static str = "WinitWindow";
     }
 
     unsafe impl WinitWindow {
-        #[sel(initWithContentRect:styleMask:state:)]
+        #[method(initWithContentRect:styleMask:state:)]
         unsafe fn init(
-            &mut self,
+            this: *mut Self,
             frame: NSRect,
             mask: NSWindowStyleMask,
             state: *mut c_void,
         ) -> Option<NonNull<Self>> {
             let this: Option<&mut Self> = unsafe {
                 msg_send![
-                    super(self),
+                    super(this),
                     initWithContentRect: frame,
                     styleMask: mask,
                     backing: NSBackingStoreType::NSBackingStoreBuffered,
@@ -152,13 +156,13 @@ declare_class!(
     }
 
     unsafe impl WinitWindow {
-        #[sel(canBecomeMainWindow)]
+        #[method(canBecomeMainWindow)]
         fn can_become_main_window(&self) -> bool {
             trace_scope!("canBecomeMainWindow");
             true
         }
 
-        #[sel(canBecomeKeyWindow)]
+        #[method(canBecomeKeyWindow)]
         fn can_become_key_window(&self) -> bool {
             trace_scope!("canBecomeKeyWindow");
             true
@@ -249,7 +253,7 @@ impl WinitWindow {
     pub(crate) fn new(
         attrs: WindowAttributes,
         pl_attrs: PlatformSpecificWindowBuilderAttributes,
-    ) -> Result<(Id<Self, Shared>, Id<WinitWindowDelegate, Shared>), RootOsError> {
+    ) -> Result<(Id<Self>, Id<WinitWindowDelegate>), RootOsError> {
         trace_scope!("WinitWindow::new");
 
         if !is_main_thread() {
@@ -334,9 +338,9 @@ impl WinitWindow {
 
             // Pass the state through FFI to the method declared on the class
             let state_ptr: *mut c_void = Box::into_raw(Box::new(Mutex::new(state))).cast();
-            let this: Option<Id<Self, Shared>> = unsafe {
+            let this: Option<Id<Self>> = unsafe {
                 msg_send_id![
-                    msg_send_id![WinitWindow::class(), alloc],
+                    WinitWindow::alloc(),
                     initWithContentRect: frame,
                     styleMask: masks,
                     state: state_ptr,
@@ -413,27 +417,26 @@ impl WinitWindow {
         match attrs.parent_window {
             Some(RawWindowHandle::AppKit(handle)) => {
                 // SAFETY: Caller ensures the pointer is valid or NULL
-                let parent: Id<NSWindow, Shared> =
-                    match unsafe { Id::retain(handle.ns_window.cast()) } {
-                        Some(window) => window,
-                        None => {
-                            // SAFETY: Caller ensures the pointer is valid or NULL
-                            let parent_view: Id<NSView, Shared> =
-                                match unsafe { Id::retain(handle.ns_view.cast()) } {
-                                    Some(view) => view,
-                                    None => {
-                                        return Err(os_error!(OsError::CreationError(
-                                            "raw window handle should be non-empty"
-                                        )))
-                                    }
-                                };
-                            parent_view.window().ok_or_else(|| {
-                                os_error!(OsError::CreationError(
-                                    "parent view should be installed in a window"
-                                ))
-                            })?
-                        }
-                    };
+                let parent: Id<NSWindow> = match unsafe { Id::retain(handle.ns_window.cast()) } {
+                    Some(window) => window,
+                    None => {
+                        // SAFETY: Caller ensures the pointer is valid or NULL
+                        let parent_view: Id<NSView> =
+                            match unsafe { Id::retain(handle.ns_view.cast()) } {
+                                Some(view) => view,
+                                None => {
+                                    return Err(os_error!(OsError::CreationError(
+                                        "raw window handle should be non-empty"
+                                    )))
+                                }
+                            };
+                        parent_view.window().ok_or_else(|| {
+                            os_error!(OsError::CreationError(
+                                "parent view should be installed in a window"
+                            ))
+                        })?
+                    }
+                };
                 // SAFETY: We know that there are no parent -> child -> parent cycles since the only place in `winit`
                 // where we allow making a window a child window is right here, just after it's been created.
                 unsafe { parent.addChildWindow(&this, NSWindowOrderingMode::NSWindowAbove) };
@@ -477,7 +480,7 @@ impl WinitWindow {
         this.set_window_level(attrs.window_level);
 
         // register for drag and drop operations.
-        this.registerForDraggedTypes(&NSArray::from_slice(&[
+        this.registerForDraggedTypes(&NSArray::from_id_slice(&[
             unsafe { NSFilenamesPboardType }.copy()
         ]));
 
@@ -521,13 +524,7 @@ impl WinitWindow {
         Ok((this, delegate))
     }
 
-    pub(super) fn retain(&self) -> Id<WinitWindow, Shared> {
-        // SAFETY: The pointer is valid, and the window is always `Shared`
-        // TODO(madsmtm): Remove the need for unsafety here
-        unsafe { Id::retain(self as *const Self as *mut Self).unwrap() }
-    }
-
-    pub(super) fn view(&self) -> Id<WinitView, Shared> {
+    pub(super) fn view(&self) -> Id<WinitView> {
         // SAFETY: The view inside WinitWindow is always `WinitView`
         unsafe { Id::cast(self.contentView()) }
     }
@@ -1462,7 +1459,7 @@ pub(super) fn get_ns_theme() -> Theme {
         return Theme::Light;
     }
     let appearance = app.effectiveAppearance();
-    let name = appearance.bestMatchFromAppearancesWithNames(&NSArray::from_slice(&[
+    let name = appearance.bestMatchFromAppearancesWithNames(&NSArray::from_id_slice(&[
         NSString::from_str("NSAppearanceNameAqua"),
         NSString::from_str("NSAppearanceNameDarkAqua"),
     ]));
diff --git a/src/platform_impl/macos/window_delegate.rs b/src/platform_impl/macos/window_delegate.rs
index 0b50de82..16f0d91d 100644
--- a/src/platform_impl/macos/window_delegate.rs
+++ b/src/platform_impl/macos/window_delegate.rs
@@ -2,11 +2,11 @@
 use std::cell::Cell;
 use std::ptr::{self, NonNull};
 
+use icrate::Foundation::{NSArray, NSObject, NSSize, NSString};
 use objc2::declare::{Ivar, IvarDrop};
-use objc2::foundation::{NSArray, NSObject, NSSize, NSString};
-use objc2::rc::{autoreleasepool, Id, Shared};
+use objc2::rc::{autoreleasepool, Id};
 use objc2::runtime::Object;
-use objc2::{class, declare_class, msg_send, msg_send_id, sel, ClassType};
+use objc2::{class, declare_class, msg_send, msg_send_id, mutability, sel, ClassType};
 
 use super::appkit::{
     NSApplicationPresentationOptions, NSFilenamesPboardType, NSPasteboard, NSWindowOcclusionState,
@@ -25,7 +25,7 @@ use crate::{
 };
 
 #[derive(Debug)]
-struct State {
+pub struct State {
     // This is set when WindowBuilder::with_fullscreen was set,
     // see comments of `window_did_fail_to_enter_fullscreen`
     initial_fullscreen: Cell<bool>,
@@ -40,26 +40,30 @@ struct State {
 declare_class!(
     #[derive(Debug)]
     pub(crate) struct WinitWindowDelegate {
-        window: IvarDrop<Id<WinitWindow, Shared>>,
+        window: IvarDrop<Id<WinitWindow>, "_window">,
 
         // TODO: It may be possible for delegate methods to be called
         // asynchronously, causing data races panics?
         // TODO: Remove unnecessary boxing here
-        state: IvarDrop<Box<State>>,
+        state: IvarDrop<Box<State>, "_state">,
     }
 
+    mod ivars;
+
     unsafe impl ClassType for WinitWindowDelegate {
         type Super = NSObject;
+        type Mutability = mutability::InteriorMutable;
+        const NAME: &'static str = "WinitWindowDelegate";
     }
 
     unsafe impl WinitWindowDelegate {
-        #[sel(initWithWindow:initialFullscreen:)]
+        #[method(initWithWindow:initialFullscreen:)]
         unsafe fn init_with_winit(
-            &mut self,
+            this: *mut Self,
             window: &WinitWindow,
             initial_fullscreen: bool,
         ) -> Option<NonNull<Self>> {
-            let this: Option<&mut Self> = unsafe { msg_send![super(self), init] };
+            let this: Option<&mut Self> = unsafe { msg_send![super(this), init] };
             this.map(|this| {
                 let scale_factor = window.scale_factor();
 
@@ -79,7 +83,7 @@ declare_class!(
                 this.window.setDelegate(Some(this));
 
                 // Enable theme change event
-                let notification_center: Id<Object, Shared> =
+                let notification_center: Id<Object> =
                     unsafe { msg_send_id![class!(NSDistributedNotificationCenter), defaultCenter] };
                 let notification_name =
                     NSString::from_str("AppleInterfaceThemeChangedNotification");
@@ -100,14 +104,14 @@ declare_class!(
 
     // NSWindowDelegate + NSDraggingDestination protocols
     unsafe impl WinitWindowDelegate {
-        #[sel(windowShouldClose:)]
+        #[method(windowShouldClose:)]
         fn window_should_close(&self, _: Option<&Object>) -> bool {
             trace_scope!("windowShouldClose:");
             self.queue_event(WindowEvent::CloseRequested);
             false
         }
 
-        #[sel(windowWillClose:)]
+        #[method(windowWillClose:)]
         fn window_will_close(&self, _: Option<&Object>) {
             trace_scope!("windowWillClose:");
             // `setDelegate:` retains the previous value and then autoreleases it
@@ -119,14 +123,14 @@ declare_class!(
             self.queue_event(WindowEvent::Destroyed);
         }
 
-        #[sel(windowDidResize:)]
+        #[method(windowDidResize:)]
         fn window_did_resize(&self, _: Option<&Object>) {
             trace_scope!("windowDidResize:");
             // NOTE: WindowEvent::Resized is reported in frameDidChange.
             self.emit_move_event();
         }
 
-        #[sel(windowWillStartLiveResize:)]
+        #[method(windowWillStartLiveResize:)]
         fn window_will_start_live_resize(&self, _: Option<&Object>) {
             trace_scope!("windowWillStartLiveResize:");
 
@@ -137,26 +141,26 @@ declare_class!(
             self.window.set_resize_increments_inner(increments);
         }
 
-        #[sel(windowDidEndLiveResize:)]
+        #[method(windowDidEndLiveResize:)]
         fn window_did_end_live_resize(&self, _: Option<&Object>) {
             trace_scope!("windowDidEndLiveResize:");
             self.window.set_resize_increments_inner(NSSize::new(1., 1.));
         }
 
         // This won't be triggered if the move was part of a resize.
-        #[sel(windowDidMove:)]
+        #[method(windowDidMove:)]
         fn window_did_move(&self, _: Option<&Object>) {
             trace_scope!("windowDidMove:");
             self.emit_move_event();
         }
 
-        #[sel(windowDidChangeBackingProperties:)]
+        #[method(windowDidChangeBackingProperties:)]
         fn window_did_change_backing_properties(&self, _: Option<&Object>) {
             trace_scope!("windowDidChangeBackingProperties:");
             self.queue_static_scale_factor_changed_event();
         }
 
-        #[sel(windowDidBecomeKey:)]
+        #[method(windowDidBecomeKey:)]
         fn window_did_become_key(&self, _: Option<&Object>) {
             trace_scope!("windowDidBecomeKey:");
             // TODO: center the cursor if the window had mouse grab when it
@@ -164,7 +168,7 @@ declare_class!(
             self.queue_event(WindowEvent::Focused(true));
         }
 
-        #[sel(windowDidResignKey:)]
+        #[method(windowDidResignKey:)]
         fn window_did_resign_key(&self, _: Option<&Object>) {
             trace_scope!("windowDidResignKey:");
             // It happens rather often, e.g. when the user is Cmd+Tabbing, that the
@@ -180,15 +184,15 @@ declare_class!(
         }
 
         /// Invoked when the dragged image enters destination bounds or frame
-        #[sel(draggingEntered:)]
-        fn dragging_entered(&self, sender: *mut Object) -> bool {
+        #[method(draggingEntered:)]
+        fn dragging_entered(&self, sender: &NSObject) -> bool {
             trace_scope!("draggingEntered:");
 
             use std::path::PathBuf;
 
-            let pb: Id<NSPasteboard, Shared> = unsafe { msg_send_id![sender, draggingPasteboard] };
+            let pb: Id<NSPasteboard> = unsafe { msg_send_id![sender, draggingPasteboard] };
             let filenames = pb.propertyListForType(unsafe { NSFilenamesPboardType });
-            let filenames: Id<NSArray<NSString>, Shared> = unsafe { Id::cast(filenames) };
+            let filenames: Id<NSArray<NSString>> = unsafe { Id::cast(filenames) };
 
             filenames.into_iter().for_each(|file| {
                 let path = PathBuf::from(file.to_string());
@@ -199,22 +203,22 @@ declare_class!(
         }
 
         /// Invoked when the image is released
-        #[sel(prepareForDragOperation:)]
-        fn prepare_for_drag_operation(&self, _: Option<&Object>) -> bool {
+        #[method(prepareForDragOperation:)]
+        fn prepare_for_drag_operation(&self, _sender: &NSObject) -> bool {
             trace_scope!("prepareForDragOperation:");
             true
         }
 
         /// Invoked after the released image has been removed from the screen
-        #[sel(performDragOperation:)]
-        fn perform_drag_operation(&self, sender: *mut Object) -> bool {
+        #[method(performDragOperation:)]
+        fn perform_drag_operation(&self, sender: &NSObject) -> bool {
             trace_scope!("performDragOperation:");
 
             use std::path::PathBuf;
 
-            let pb: Id<NSPasteboard, Shared> = unsafe { msg_send_id![sender, draggingPasteboard] };
+            let pb: Id<NSPasteboard> = unsafe { msg_send_id![sender, draggingPasteboard] };
             let filenames = pb.propertyListForType(unsafe { NSFilenamesPboardType });
-            let filenames: Id<NSArray<NSString>, Shared> = unsafe { Id::cast(filenames) };
+            let filenames: Id<NSArray<NSString>> = unsafe { Id::cast(filenames) };
 
             filenames.into_iter().for_each(|file| {
                 let path = PathBuf::from(file.to_string());
@@ -225,20 +229,20 @@ declare_class!(
         }
 
         /// Invoked when the dragging operation is complete
-        #[sel(concludeDragOperation:)]
-        fn conclude_drag_operation(&self, _: Option<&Object>) {
+        #[method(concludeDragOperation:)]
+        fn conclude_drag_operation(&self, _sender: Option<&NSObject>) {
             trace_scope!("concludeDragOperation:");
         }
 
         /// Invoked when the dragging operation is cancelled
-        #[sel(draggingExited:)]
-        fn dragging_exited(&self, _: Option<&Object>) {
+        #[method(draggingExited:)]
+        fn dragging_exited(&self, _sender: Option<&NSObject>) {
             trace_scope!("draggingExited:");
             self.queue_event(WindowEvent::HoveredFileCancelled);
         }
 
         /// Invoked when before enter fullscreen
-        #[sel(windowWillEnterFullScreen:)]
+        #[method(windowWillEnterFullScreen:)]
         fn window_will_enter_fullscreen(&self, _: Option<&Object>) {
             trace_scope!("windowWillEnterFullScreen:");
 
@@ -267,7 +271,7 @@ declare_class!(
         }
 
         /// Invoked when before exit fullscreen
-        #[sel(windowWillExitFullScreen:)]
+        #[method(windowWillExitFullScreen:)]
         fn window_will_exit_fullscreen(&self, _: Option<&Object>) {
             trace_scope!("windowWillExitFullScreen:");
 
@@ -275,7 +279,7 @@ declare_class!(
             shared_state.in_fullscreen_transition = true;
         }
 
-        #[sel(window:willUseFullScreenPresentationOptions:)]
+        #[method(window:willUseFullScreenPresentationOptions:)]
         fn window_will_use_fullscreen_presentation_options(
             &self,
             _: Option<&Object>,
@@ -304,7 +308,7 @@ declare_class!(
         }
 
         /// Invoked when entered fullscreen
-        #[sel(windowDidEnterFullScreen:)]
+        #[method(windowDidEnterFullScreen:)]
         fn window_did_enter_fullscreen(&self, _: Option<&Object>) {
             trace_scope!("windowDidEnterFullScreen:");
             self.state.initial_fullscreen.set(false);
@@ -318,7 +322,7 @@ declare_class!(
         }
 
         /// Invoked when exited fullscreen
-        #[sel(windowDidExitFullScreen:)]
+        #[method(windowDidExitFullScreen:)]
         fn window_did_exit_fullscreen(&self, _: Option<&Object>) {
             trace_scope!("windowDidExitFullScreen:");
 
@@ -348,7 +352,7 @@ declare_class!(
         /// due to being in the midst of handling some other animation or user gesture.
         /// This method indicates that there was an error, and you should clean up any
         /// work you may have done to prepare to enter full-screen mode.
-        #[sel(windowDidFailToEnterFullScreen:)]
+        #[method(windowDidFailToEnterFullScreen:)]
         fn window_did_fail_to_enter_fullscreen(&self, _: Option<&Object>) {
             trace_scope!("windowDidFailToEnterFullScreen:");
             let mut shared_state = self
@@ -372,7 +376,7 @@ declare_class!(
         }
 
         // Invoked when the occlusion state of the window changes
-        #[sel(windowDidChangeOcclusionState:)]
+        #[method(windowDidChangeOcclusionState:)]
         fn window_did_change_occlusion_state(&self, _: Option<&Object>) {
             trace_scope!("windowDidChangeOcclusionState:");
             self.queue_event(WindowEvent::Occluded(
@@ -384,7 +388,7 @@ declare_class!(
         }
 
         // Observe theme change
-        #[sel(effectiveAppearanceDidChange:)]
+        #[method(effectiveAppearanceDidChange:)]
         fn effective_appearance_did_change(&self, sender: Option<&Object>) {
             trace_scope!("Triggered `effectiveAppearanceDidChange:`");
             unsafe {
@@ -397,7 +401,7 @@ declare_class!(
             }
         }
 
-        #[sel(effectiveAppearanceDidChangedOnMainThread:)]
+        #[method(effectiveAppearanceDidChangedOnMainThread:)]
         fn effective_appearance_did_changed_on_main_thread(&self, _: Option<&Object>) {
             let theme = get_ns_theme();
             let mut shared_state = self
@@ -411,7 +415,7 @@ declare_class!(
             }
         }
 
-        #[sel(windowDidChangeScreen:)]
+        #[method(windowDidChangeScreen:)]
         fn window_did_change_screen(&self, _: Option<&Object>) {
             trace_scope!("windowDidChangeScreen:");
             let is_simple_fullscreen = self
@@ -428,10 +432,10 @@ declare_class!(
 );
 
 impl WinitWindowDelegate {
-    pub fn new(window: &WinitWindow, initial_fullscreen: bool) -> Id<Self, Shared> {
+    pub fn new(window: &WinitWindow, initial_fullscreen: bool) -> Id<Self> {
         unsafe {
             msg_send_id![
-                msg_send_id![Self::class(), alloc],
+                Self::alloc(),
                 initWithWindow: window,
                 initialFullscreen: initial_fullscreen,
             ]