iOS works again, lol.

- Corrects `feature` -> `target_os` checks.
- Updates the old iOS scene delegate pieces to use the new class
  structure.
- Bundles in an iOS demo app.
- Blocks off most things that should not even attempt to compile for
  iOS.

Cargo.toml

@@ -31,12 +31,17 @@ url = "2.1.1"
 eval = "0.4"
 
 [features]
-default = ["macos"]
+default = []
 cloudkit = []
-ios = []
-macos = []
 color_fallbacks = []
 quicklook = []
 user-notifications = ["uuid"]
 webview = []
 webview-downloading-macos = []
+
+[package.metadata.bundle.example.ios-beta]
+name = "ios-beta"
+identifier = "com.cacao.ios-test"
+category = "Developer Tool"
+short_description = "An example Cacao iOS app."
+long_description = "An example Cacao iOS app."

examples/ios-beta/main.rs

@@ -0,0 +1,96 @@
+use std::sync::RwLock;
+
+use cacao::ios::{
+    App, AppDelegate, Scene, SceneConfig, SceneSession,
+    SceneConnectionOptions, WindowSceneDelegate, Window
+};
+
+use cacao::color::Color;
+use cacao::layout::{Layout, LayoutConstraint};
+use cacao::view::{View, ViewController, ViewDelegate};
+
+#[derive(Default)]
+struct TestApp;
+
+impl AppDelegate for TestApp {
+    fn config_for_scene_session(&self, session: SceneSession, _options: SceneConnectionOptions) -> SceneConfig {
+        SceneConfig::new("Default Configuration", session.role())
+    }
+}
+
+#[derive(Default)]
+pub struct RootView {
+    pub red: View,
+    pub green: View,
+    pub blue: View
+}
+
+impl ViewDelegate for RootView {
+    const NAME: &'static str = "RootView";
+
+    fn did_load(&mut self, view: View) {
+        self.red.set_background_color(Color::SystemRed);
+        self.red.layer.set_corner_radius(16.);
+        view.add_subview(&self.red);
+
+        self.green.set_background_color(Color::SystemGreen);
+        view.add_subview(&self.green);
+
+        self.blue.set_background_color(Color::SystemBlue);
+        view.add_subview(&self.blue);
+
+        LayoutConstraint::activate(&[
+            self.red.top.constraint_equal_to(&view.top).offset(16.),
+            self.red.leading.constraint_equal_to(&view.leading).offset(16.),
+            self.red.trailing.constraint_equal_to(&view.trailing).offset(-16.),
+            self.red.height.constraint_equal_to_constant(100.),
+
+            self.green.top.constraint_equal_to(&self.red.bottom).offset(16.),
+            self.green.leading.constraint_equal_to(&view.leading).offset(16.),
+            self.green.trailing.constraint_equal_to(&view.trailing).offset(-16.),
+            self.green.height.constraint_equal_to_constant(120.),
+            
+            self.blue.top.constraint_equal_to(&self.green.bottom).offset(16.),
+            self.blue.leading.constraint_equal_to(&view.leading).offset(16.),
+            self.blue.trailing.constraint_equal_to(&view.trailing).offset(-16.),
+            self.blue.bottom.constraint_equal_to(&view.bottom).offset(-16.)
+        ]);
+    }
+}
+
+#[derive(Default)]
+pub struct WindowScene {
+    pub window: RwLock<Option<Window>>,
+    pub root_view_controller: RwLock<Option<ViewController<RootView>>>
+}
+
+impl WindowSceneDelegate for WindowScene {
+    fn will_connect(
+        &self,
+        scene: Scene,
+        session: SceneSession,
+        options: SceneConnectionOptions
+    ) {
+        let bounds = scene.get_bounds();
+        let mut window = Window::new(bounds);
+        window.set_window_scene(scene);
+        
+        let root_view_controller = ViewController::new(RootView::default());
+        window.set_root_view_controller(&root_view_controller);
+        window.show();
+        
+        {
+            let mut w = self.window.write().unwrap();
+            *w = Some(window);
+
+            let mut vc = self.root_view_controller.write().unwrap();
+            *vc = Some(root_view_controller);
+        }
+    }
+}
+
+fn main() {
+    App::new(TestApp::default(), || {
+        Box::new(WindowScene::default())
+    }).run();
+}

examples/ios-beta/readme.md

@@ -0,0 +1,14 @@
+# Cacao iOS Support
+This, unlike the macOS side of things, is much more alpha-quality. It does work, though - and this example will likely end up being a "kitchen sink" to figure things out with.
+
+## To run
+Since this needs to run in an iOS simulator or on a device, you can't run it like a typical example. Follow the instructions below to give it a go:
+
+- Start a simulator (Simulator.app).
+- `cargo install cargo-bundle`
+- `cargo bundle --example ios-beta --target x86_64-apple-ios`
+- `xcrun simctl install booted target/x86_64-apple-ios/debug/examples/bundle/ios/cacao-ios-test.app`
+- `xcrun simctl launch --console booted com.cacao.ios-test`
+
+## Current Support
+Not much, but the basics of the scene delegate system work, along with view support, colors, and layout. Play around!

src/button/enums.rs

@@ -2,7 +2,7 @@ use crate::foundation::NSUInteger;
 
 /// Represents a bezel style for a button. This is a macOS-specific control, and has no effect
 /// under iOS or tvOS.
-#[cfg(feature = "macos")]
+#[cfg(target_os = "macos")]
 #[derive(Debug)]
 pub enum BezelStyle {
     /// A standard circular button.
@@ -49,7 +49,7 @@ pub enum BezelStyle {
     Unknown(NSUInteger)
 }
 
-#[cfg(feature = "macos")]
+#[cfg(target_os = "macos")]
 impl From<BezelStyle> for NSUInteger {
     fn from(style: BezelStyle) -> Self {
         match style {
@@ -71,7 +71,7 @@ impl From<BezelStyle> for NSUInteger {
     }
 }
 
-#[cfg(feature = "macos")]
+#[cfg(target_os = "macos")]
 impl From<NSUInteger> for BezelStyle {
     fn from(i: NSUInteger) -> Self {
         match i {

src/button/mod.rs

@@ -36,7 +36,7 @@ use crate::layout::{Layout, LayoutAnchorX, LayoutAnchorY, LayoutAnchorDimension}
 use crate::text::{AttributedString, Font};
 use crate::utils::{load, properties::ObjcProperty};
 
-#[cfg(feature = "macos")]
+#[cfg(target_os = "macos")]
 use crate::macos::FocusRingType;
 
 mod enums;
@@ -145,7 +145,7 @@ impl Button {
     }
 
     /// Sets the bezel style for this button. Only supported on macOS.
-    #[cfg(feature = "macos")]
+    #[cfg(target_os = "macos")]
     pub fn set_bezel_style(&self, bezel_style: BezelStyle) {
         let style: NSUInteger = bezel_style.into();
         
@@ -167,7 +167,7 @@ impl Button {
     pub fn set_background_color<C: AsRef<Color>>(&self, color: C) {
         let color: id = color.as_ref().into();
         
-        #[cfg(feature = "macos")]
+        #[cfg(target_os = "macos")]
         self.objc.with_mut(|obj| unsafe {
             let cell: id = msg_send![obj, cell];
             let _: () = msg_send![cell, setBackgroundColor:color];
@@ -188,7 +188,7 @@ impl Button {
     ///
     /// On macOS, this is done by way of an `AttributedString` under the hood. 
     pub fn set_text_color<C: AsRef<Color>>(&self, color: C) {
-        #[cfg(feature = "macos")]
+        #[cfg(target_os = "macos")]
         self.objc.with_mut(move |obj| unsafe {
             let text: id = msg_send![obj, attributedTitle];
             let len: isize = msg_send![text, length];
@@ -202,7 +202,7 @@ impl Button {
 
     // @TODO: Figure out how to handle oddities like this.
     /// For buttons on macOS, one might need to disable the border. This does that.
-    #[cfg(feature = "macos")]
+    #[cfg(target_os = "macos")]
     pub fn set_bordered(&self, is_bordered: bool) {
         self.objc.with_mut(|obj| unsafe {
             let _: () = msg_send![obj, setBordered:match is_bordered {
@@ -224,7 +224,7 @@ impl Button {
     /// Sets how the control should draw a focus ring when a user is focused on it.
     ///
     /// This is a macOS-only method.
-    #[cfg(feature = "macos")]
+    #[cfg(target_os = "macos")]
     pub fn set_focus_ring_type(&self, focus_ring_type: FocusRingType) {
         let ring_type: NSUInteger = focus_ring_type.into();
 

src/color/mod.rs

@@ -10,7 +10,7 @@
 ///
 /// The goal here is to make sure that this can't reasonably break on OS's, as `Color` is kind of
 /// an important piece. It's not on the framework to make your app look good, though. To enable
-/// fallbacks, specify the `color_fallbacks` feature in your `Cargo.toml`.
+/// fallbacks, specify the `color_fallbacks` target_os in your `Cargo.toml`.
 ///
 /// @TODO: bundle iOS/tvOS support.
 
@@ -26,10 +26,10 @@ use objc_id::Id;
 use crate::foundation::id;
 use crate::utils::os;
 
-#[cfg(feature = "macos")]
+#[cfg(target_os = "macos")]
 mod macos_dynamic_color; 
 
-#[cfg(feature = "macos")]
+#[cfg(target_os = "macos")]
 use macos_dynamic_color::{
     AQUA_LIGHT_COLOR_NORMAL_CONTRAST, AQUA_LIGHT_COLOR_HIGH_CONTRAST,
     AQUA_DARK_COLOR_NORMAL_CONTRAST, AQUA_DARK_COLOR_HIGH_CONTRAST
@@ -230,11 +230,11 @@ pub enum Color {
     LightText,
 
     /// The background color for a given window in the system theme.
-    #[cfg(feature = "macos")]
+    #[cfg(target_os = "macos")]
     MacOSWindowBackgroundColor,
 
     /// The background color that should appear under a page per the system theme.
-    #[cfg(feature = "macos")]
+    #[cfg(target_os = "macos")]
     MacOSUnderPageBackgroundColor
 }
 
@@ -246,16 +246,13 @@ impl Color {
         let g = green as CGFloat / 255.0;
         let b = blue as CGFloat / 255.0;
         let a = alpha as CGFloat / 255.0;
-        
-        #[cfg(feature = "macos")]
-        let color = class!(NSColor);
-
-        #[cfg(feature = "ios")]
-        let color = class!(UIColor);
 
         Color::Custom(Arc::new(RwLock::new(unsafe {
-            #[cfg(feature = "macos")]
-            Id::from_ptr(msg_send![color, colorWithCalibratedRed:r green:g blue:b alpha:a])
+            #[cfg(target_os = "macos")]
+            { Id::from_ptr(msg_send![class!(NSColor), colorWithCalibratedRed:r green:g blue:b alpha:a]) }
+
+            #[cfg(target_os = "ios")]
+            { Id::from_ptr(msg_send![class!(UIColor), colorWithRed:r green:g blue:b alpha:a]) }
         })))
     }
     
@@ -273,15 +270,12 @@ impl Color {
         let b = brightness as CGFloat / 255.0;
         let a = alpha as CGFloat / 255.0;
 
-        #[cfg(feature = "macos")]
-        let color = class!(NSColor);
-
-        #[cfg(feature = "ios")]
-        let color = class!(UIColor);
-
         Color::Custom(Arc::new(RwLock::new(unsafe {
-            #[cfg(feature = "macos")]
-            Id::from_ptr(msg_send![color, colorWithCalibratedHue:h saturation:s brightness:b alpha:a])
+            #[cfg(target_os = "macos")]
+            { Id::from_ptr(msg_send![class!(NSColor), colorWithCalibratedHue:h saturation:s brightness:b alpha:a]) }
+
+            #[cfg(target_os = "ios")]
+            { Id::from_ptr(msg_send![class!(UIColor), colorWithHue:h saturation:s brightness:b alpha:a]) }
         })))
     }
     
@@ -294,15 +288,12 @@ impl Color {
     /// Creates and returns a white color with the specified level or intensity, along with the
     /// specified alpha.
     pub fn white_alpha(level: CGFloat, alpha: CGFloat) -> Self {
-        #[cfg(feature = "macos")]
-        let color = class!(NSColor);
-
-        #[cfg(feature = "ios")]
-        let color = class!(UIColor);
-
         Color::Custom(Arc::new(RwLock::new(unsafe {
-            #[cfg(feature = "macos")]
-            Id::from_ptr(msg_send![color, colorWithCalibratedWhite:level alpha:alpha])
+            #[cfg(target_os = "macos")]
+            { Id::from_ptr(msg_send![class!(NSColor), colorWithCalibratedWhite:level alpha:alpha]) }
+            
+            #[cfg(target_os = "ios")]
+            { Id::from_ptr(msg_send![class!(UIColor), colorWithWhite:level alpha:alpha]) }
         })))
     }
 
@@ -336,6 +327,7 @@ impl Color {
     /// "default" or "light" color.
     ///
     /// Returning a dynamic color in your handler is unsupported and may panic.
+    #[cfg(target_os = "macos")]
     pub fn dynamic<F>(handler: F) -> Self
     where
         F: Fn(Style) -> Color + 'static
@@ -345,7 +337,7 @@ impl Color {
         // not entirely clear on how expensive the dynamic allocation would be pre-10.15/11.0 and
         // am happy to do this for now and let someone who needs true dynamic allocation look into
         // it and PR it.
-        #[cfg(feature = "macos")]
+        #[cfg(target_os = "macos")]
         Color::Custom(Arc::new(RwLock::new(unsafe {
             let color: id = msg_send![macos_dynamic_color::register_class(), new];
 
@@ -429,7 +421,7 @@ impl From<&Color> for id {
 /// Handles color fallback for system-provided colors.
 macro_rules! system_color_with_fallback {
     ($class:ident, $color:ident, $fallback:ident) => ({
-        #[cfg(feature = "macos")]
+        #[cfg(target_os = "macos")]
         {
             #[cfg(feature = "color-fallbacks")]
             if os::minimum_semversion(10, 10, 0) {
@@ -441,6 +433,11 @@ macro_rules! system_color_with_fallback {
             #[cfg(not(feature = "color-fallbacks"))]
             msg_send![$class, $color]
         }
+
+        #[cfg(target_os = "ios")]
+        {
+            msg_send![$class, $color]
+        }
     })
 }
 
@@ -453,10 +450,10 @@ macro_rules! system_color_with_fallback {
 /// The goal here is to make sure that this can't reasonably break on OS's, as `Color` is kind of
 /// an important piece. It's not on the framework to make your app look good, though.
 unsafe fn to_objc(obj: &Color) -> id {
-    #[cfg(feature = "macos")]
+    #[cfg(target_os = "macos")]
     let color = class!(NSColor);
 
-    #[cfg(feature = "ios")]
+    #[cfg(target_os = "ios")]
     let color = class!(UIColor);
 
     match obj {
@@ -503,10 +500,10 @@ unsafe fn to_objc(obj: &Color) -> id {
         Color::DarkText => system_color_with_fallback!(color, darkTextColor, blackColor),
         Color::LightText => system_color_with_fallback!(color, lightTextColor, whiteColor),
         
-        #[cfg(feature = "macos")]
+        #[cfg(target_os = "macos")]
         Color::MacOSWindowBackgroundColor => system_color_with_fallback!(color, windowBackgroundColor, clearColor),
         
-        #[cfg(feature = "macos")]
+        #[cfg(target_os = "macos")]
         Color::MacOSUnderPageBackgroundColor => system_color_with_fallback!(color, underPageBackgroundColor, clearColor),
     }
 }

src/image/icons.rs

@@ -9,7 +9,7 @@
 ///
 /// You can opt to include vector assets in your bundle, or draw icons with `Image::draw` by
 /// converting Core Graphics calls (e.g, PaintCode can work well for this).
-#[cfg(feature = "macos")]
+#[cfg(target_os = "macos")]
 #[derive(Debug)]
 pub enum MacSystemIcon {
     /// A standard "General" preferences icon. This is intended for usage in Preferences toolbars.
@@ -26,7 +26,7 @@ pub enum MacSystemIcon {
     Add
 }
 
-#[cfg(feature = "macos")]
+#[cfg(target_os = "macos")]
 impl MacSystemIcon {
     /// Maps system icons to their pre-11.0 framework identifiers.
     pub fn to_str(&self) -> &'static str {

src/image/image.rs

@@ -133,7 +133,7 @@ impl Image {
 
     /// Returns a stock system icon. These are guaranteed to exist across all versions of macOS
     /// supported.
-    #[cfg(feature = "macos")]
+    #[cfg(target_os = "macos")]
     pub fn system_icon(icon: MacSystemIcon, accessibility_description: &str) -> Self {
         Image(unsafe {
             ShareId::from_ptr(match os::is_minimum_version(11) {
@@ -166,7 +166,7 @@ impl Image {
                 },
 
                 false => {
-                    #[cfg(feature = "macos")]
+                    #[cfg(target_os = "macos")]
                     panic!("SFSymbols are only supported on macOS 11.0 and up.");
                 }
             })

src/ios/app/mod.rs

@@ -49,7 +49,7 @@ mod class;
 use class::register_app_class;
 
 mod delegate;
-use delegate::{register_app_delegate_class};
+use delegate::register_app_delegate_class;
 
 mod enums;
 pub use enums::*;
@@ -95,6 +95,14 @@ pub struct App<
     _w: std::marker::PhantomData<W>
 }
 
+// Temporary. ;P
+impl<W, T, F> std::fmt::Debug for App<W, T, F> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("App<W, T, F>")
+            .finish()
+    }
+}
+
 impl<T, W, F> App<T, W, F>
 where 
     T: AppDelegate + 'static,
@@ -134,8 +142,8 @@ where
         
         App {
             delegate: app_delegate,
-            vendor: vendor,
-            pool: pool,
+            vendor,
+            pool,
             _w: std::marker::PhantomData
         }
     }
@@ -145,14 +153,24 @@ impl<T, W, F> App<T, W, F> {
     /// Handles calling through to `UIApplicationMain()`, ensuring that it's using our custom
     /// `UIApplication` and `UIApplicationDelegate` classes.
     pub fn run(&self) {
-        let args = std::env::args().map(|arg| CString::new(arg).unwrap() ).collect::<Vec<CString>>();
-        let c_args = args.iter().map(|arg| arg.as_ptr()).collect::<Vec<*const c_char>>();
+        let args = std::env::args().map(|arg| {
+            CString::new(arg).unwrap()
+        }).collect::<Vec<CString>>();
+
+        let c_args = args.iter().map(|arg| {
+            arg.as_ptr()
+        }).collect::<Vec<*const c_char>>();
         
-        let s = NSString::no_copy("RSTApplication");
-        let s2 = NSString::no_copy("RSTAppDelegate");
+        let mut s = NSString::new("RSTApplication");
+        let mut s2 = NSString::new("RSTAppDelegate");
 
         unsafe {
-            UIApplicationMain(c_args.len() as c_int, c_args.as_ptr(), &*s, &*s2);
+            UIApplicationMain(
+                c_args.len() as c_int,
+                c_args.as_ptr(),
+                s.into(),
+                s2.into()
+            );
         }
 
         self.pool.drain();

src/ios/scene/delegate.rs

@@ -1,7 +1,3 @@
-//! This module implements forwarding methods for standard `UIApplicationDelegate` calls. It also
-//! creates a custom `UIApplication` subclass that currently does nothing; this is meant as a hook
-//! for potential future use.
-
 use std::ffi::c_void;
 use std::sync::Once;
 use std::unreachable;
@@ -39,7 +35,7 @@ extern fn init<
         let factory: &F = &*scene_delegate_vendor;
         let scene_delegate = factory();
         let scene_delegate_ptr = Box::into_raw(scene_delegate);
-        println!("scene ptr: {:p}", scene_delegate_ptr);
+        //println!("scene ptr: {:p}", scene_delegate_ptr);
         this.set_ivar(WINDOW_SCENE_PTR, scene_delegate_ptr as usize);
 
         this

src/ios/scene/enums.rs

@@ -15,11 +15,11 @@ pub enum SessionRole {
 
 impl From<SessionRole> for NSString<'_> {
     fn from(role: SessionRole) -> Self {
-        NSString::new(match role {
+        match role {
             SessionRole::Application => NSString::no_copy("UIWindowSceneSessionRoleApplication"),
             SessionRole::ExternalDisplay => NSString::no_copy("UIWindowSceneSessionRoleExternalDisplay"),
             //SessionRole::CarPlayApplication => ""
-        })
+        }
     }
 }
 

src/ios/scene/session.rs

@@ -16,7 +16,7 @@ impl SceneSession {
     }
 
     pub fn role(&self) -> SessionRole {
-        NSString::wrap(unsafe {
+        NSString::from_retained(unsafe {
             msg_send![&*self.0, role]
         }).into()
     }

src/layout/traits.rs

@@ -9,6 +9,8 @@ use objc_id::ShareId;
 
 use crate::foundation::{id, nil, to_bool, YES, NO, NSArray, NSString};
 use crate::geometry::Rect;
+
+#[cfg(target_os = "macos")]
 use crate::pasteboard::PasteboardType;
 
 /// A trait that view wrappers must conform to. Enables managing the subview tree.
@@ -103,6 +105,7 @@ pub trait Layout {
     }
     
     /// Returns whether this is hidden, *or* whether an ancestor view is hidden.
+    #[cfg(target_os = "macos")]
     fn is_hidden_or_ancestor_is_hidden(&self) -> bool {
         self.get_from_backing_node(|obj| {
             to_bool(unsafe {
@@ -112,6 +115,7 @@ pub trait Layout {
     }
 
     /// Register this view for drag and drop operations.
+    #[cfg(target_os = "macos")]
     fn register_for_dragged_types(&self, types: &[PasteboardType]) {
         let types: NSArray = types.into_iter().map(|t| {
             let x: NSString = (*t).into();
@@ -124,6 +128,7 @@ pub trait Layout {
     }
 
     /// Unregisters this as a target for drag and drop operations.
+    #[cfg(target_os = "macos")]
     fn unregister_dragged_types(&self) { 
         self.with_backing_node(|obj| unsafe {
             let _: () = msg_send![obj, unregisterDraggedTypes];
@@ -134,6 +139,7 @@ pub trait Layout {
     ///
     /// If you have a high performance tableview or collectionview that has issues, disabling these
     /// can be helpful - but always test!
+    #[cfg(target_os = "macos")]
     fn set_posts_frame_change_notifications(&self, posts: bool) {
         self.with_backing_node(|obj| unsafe {
             let _: () = msg_send![obj, setPostsFrameChangedNotifications:match posts {
@@ -147,6 +153,7 @@ pub trait Layout {
     ///
     /// If you have a high performance tableview or collectionview that has issues, disabling these
     /// can be helpful - but always test!
+    #[cfg(target_os = "macos")]
     fn set_posts_bounds_change_notifications(&self, posts: bool) {
         self.with_backing_node(|obj| unsafe {
             let _: () = msg_send![obj, setPostsBoundsChangedNotifications:match posts {

src/lib.rs

@@ -96,14 +96,15 @@ pub use objc;
 pub use url;
 pub use lazy_static;
 
-#[cfg(feature = "macos")]
-#[cfg_attr(docsrs, doc(cfg(feature = "macos")))]
+#[cfg(target_os = "macos")]
+#[cfg_attr(docsrs, doc(cfg(target_os = "macos")))]
 pub mod macos;
 
-#[cfg(feature = "ios")]
-#[cfg_attr(docsrs, doc(cfg(feature = "ios")))]
+#[cfg(target_os = "ios")]
+#[cfg_attr(docsrs, doc(cfg(target_os = "ios")))]
 pub mod ios;
 
+#[cfg(target_os = "macos")]
 pub mod button;
 
 #[cfg(any(feature = "cloudkit", doc))]
@@ -111,25 +112,51 @@ pub mod button;
 pub mod cloudkit;
 
 pub mod color;
+
+#[cfg(target_os = "macos")]
 pub mod dragdrop;
+
 pub mod error;
+
+#[cfg(target_os = "macos")]
 pub mod events;
+
 pub mod defaults;
+
+#[cfg(target_os = "macos")]
 pub mod filesystem;
+
 pub mod foundation;
 pub mod geometry;
+
+#[cfg(target_os = "macos")]
 pub mod image;
+
+#[cfg(target_os = "macos")]
 pub mod input;
+
 pub mod layer;
 pub(crate) mod invoker;
 pub mod layout;
+
+#[cfg(target_os = "macos")]
 pub mod listview;
 pub mod networking;
 pub mod notification_center;
+
+#[cfg(target_os = "macos")]
 pub mod pasteboard;
+
+#[cfg(target_os = "macos")]
 pub mod progress;
+
+#[cfg(target_os = "macos")]
 pub mod scrollview;
+
+#[cfg(target_os = "macos")]
 pub mod switch;
+
+#[cfg(target_os = "macos")]
 pub mod text;
 
 #[cfg(feature = "quicklook")]

src/listview/mod.rs

@@ -364,7 +364,7 @@ impl<T> ListView<T> {
 
     /// Sets the style for the underlying NSTableView. This property is only supported on macOS
     /// 11.0+, and will always be `FullWidth` on anything older.
-    #[cfg(feature = "macos")]
+    #[cfg(target_os = "macos")]
     pub fn set_style(&self, style: crate::foundation::NSInteger) {
         if os::is_minimum_version(11) {
             self.objc.with_mut(|obj| unsafe {
@@ -378,7 +378,7 @@ impl<T> ListView<T> {
     /// This defaults to `true`, but some macOS pieces (e.g, a sidebar) may want this set to
     /// `false`. This can be particularly useful when implementing a Source List style sidebar
     /// view for navigation purposes.
-    #[cfg(feature = "macos")]
+    #[cfg(target_os = "macos")]
     pub fn set_allows_empty_selection(&self, allows: bool) {
         self.objc.with_mut(|obj| unsafe {
             let _: () = msg_send![obj, setAllowsEmptySelection:match allows {

src/macos/enums.rs

@@ -3,7 +3,7 @@
 use crate::foundation::{NSUInteger};
 
 /// Used to set whether and/or how a view or cell draws a focus ring.
-#[cfg(feature = "macos")]
+#[cfg(target_os = "macos")]
 #[derive(Debug)]
 pub enum FocusRingType {
     /// Whatever the default is.
@@ -20,7 +20,7 @@ pub enum FocusRingType {
     Unknown(NSUInteger)
 }
 
-#[cfg(feature = "macos")]
+#[cfg(target_os = "macos")]
 impl From<FocusRingType> for NSUInteger {
     fn from(ring_type: FocusRingType) -> Self {
         match ring_type {

src/progress/mod.rs

@@ -79,11 +79,11 @@ impl ProgressIndicator {
     /// need it to stay around.
     pub fn new() -> Self {
         let view = unsafe {
-            #[cfg(feature = "macos")]
+            #[cfg(target_os = "macos")]
             let view: id = msg_send![class!(NSProgressIndicator), new];
             let _: () = msg_send![view, setTranslatesAutoresizingMaskIntoConstraints:NO];
 
-            #[cfg(feature = "macos")]
+            #[cfg(target_os = "macos")]
             let _: () = msg_send![view, setWantsLayer:YES];
 
             view

src/view/controller/ios.rs

@@ -5,9 +5,10 @@ use objc::declare::ClassDecl;
 use objc::runtime::{Class, Object, Sel};
 use objc::{class, msg_send, sel, sel_impl};
 
-use crate::foundation::{BOOL};
+use crate::foundation::load_or_register_class;
+use crate::foundation::{BOOL, to_bool};
 use crate::view::{VIEW_DELEGATE_PTR, ViewDelegate};
-use crate::utils::{load, as_bool};
+use crate::utils::load;
 
 /// Called when the view controller receives a `viewWillAppear:` message.
 extern fn will_appear<T: ViewDelegate>(this: &mut Object, _: Sel, animated: BOOL) {
@@ -16,7 +17,7 @@ extern fn will_appear<T: ViewDelegate>(this: &mut Object, _: Sel, animated: BOOL
     }
 
     let controller = load::<T>(this, VIEW_DELEGATE_PTR);
-    controller.will_appear(as_bool(animated));
+    controller.will_appear(to_bool(animated));
 }
 
 /// Called when the view controller receives a `viewDidAppear:` message.
@@ -26,7 +27,7 @@ extern fn did_appear<T: ViewDelegate>(this: &mut Object, _: Sel, animated: BOOL)
     }
 
     let controller = load::<T>(this, VIEW_DELEGATE_PTR);
-    controller.did_appear(as_bool(animated));
+    controller.did_appear(to_bool(animated));
 }
 
 /// Called when the view controller receives a `viewWillDisappear:` message.
@@ -36,7 +37,7 @@ extern fn will_disappear<T: ViewDelegate>(this: &mut Object, _: Sel, animated: B
     }
 
     let controller = load::<T>(this, VIEW_DELEGATE_PTR);
-    controller.will_disappear(as_bool(animated));
+    controller.will_disappear(to_bool(animated));
 }
 
 /// Called when the view controller receives a `viewDidDisappear:` message.
@@ -46,27 +47,17 @@ extern fn did_disappear<T: ViewDelegate>(this: &mut Object, _: Sel, animated: BO
     }
 
     let controller = load::<T>(this, VIEW_DELEGATE_PTR);
-    controller.did_disappear(as_bool(animated));
+    controller.did_disappear(to_bool(animated));
 }
 
 /// Registers an `NSViewDelegate`.
-pub(crate) fn register_view_controller_class<T: ViewDelegate + 'static>() -> *const Class {
-    static mut VIEW_CLASS: *const Class = 0 as *const Class;
-    static INIT: Once = Once::new();
-
-    INIT.call_once(|| unsafe {
-        let superclass = class!(UIViewController);
-        let mut decl = ClassDecl::new("RSTViewController", superclass).unwrap();
-
+pub(crate) fn register_view_controller_class<T: ViewDelegate + 'static>(instance: &T) -> *const Class {
+    load_or_register_class("UIViewController", instance.subclass_name(), |decl| unsafe {
         decl.add_ivar::<usize>(VIEW_DELEGATE_PTR);
-
+        
         decl.add_method(sel!(viewWillAppear:), will_appear::<T> as extern fn(&mut Object, _, BOOL));
         decl.add_method(sel!(viewDidAppear:), did_appear::<T> as extern fn(&mut Object, _, BOOL));
         decl.add_method(sel!(viewWillDisappear:), will_disappear::<T> as extern fn(&mut Object, _, BOOL));
         decl.add_method(sel!(viewDidDisappear:), did_disappear::<T> as extern fn(&mut Object, _, BOOL));
-
-        VIEW_CLASS = decl.register();
-    });
-
-    unsafe { VIEW_CLASS }
+    })
 }

src/view/ios.rs

@@ -5,8 +5,8 @@ use objc::runtime::{Class, Object, Sel, BOOL};
 use objc::{class, sel, sel_impl};
 use objc_id::Id;
 
+use crate::foundation::load_or_register_class;
 use crate::foundation::{id, YES, NO, NSUInteger};
-use crate::dragdrop::DragInfo;
 use crate::view::{VIEW_DELEGATE_PTR, ViewDelegate};
 use crate::utils::load;
 
@@ -26,20 +26,10 @@ pub(crate) fn register_view_class() -> *const Class {
     unsafe { VIEW_CLASS }
 }
 
-/// Injects an `NSView` subclass, with some callback and pointer ivars for what we
+/// Injects a `UIView` subclass, with some callback and pointer ivars for what we
 /// need to do.
-pub(crate) fn register_view_class_with_delegate<T: ViewDelegate>() -> *const Class {
-    static mut VIEW_CLASS: *const Class = 0 as *const Class;
-    static INIT: Once = Once::new();
-
-    INIT.call_once(|| unsafe {
-        let superclass = class!(UIView);
-        let mut decl = ClassDecl::new("RSTViewWithDelegate", superclass).unwrap();
+pub(crate) fn register_view_class_with_delegate<T: ViewDelegate>(instance: &T) -> *const Class {
+    load_or_register_class("UIView", instance.subclass_name(), |decl| unsafe {
         decl.add_ivar::<usize>(VIEW_DELEGATE_PTR);
-        VIEW_CLASS = decl.register();
-    });
-
-    unsafe {
-        VIEW_CLASS
-    }
+    })
 }

src/view/mod.rs

@@ -48,9 +48,11 @@ use crate::foundation::{id, nil, YES, NO, NSArray, NSString};
 use crate::color::Color;
 use crate::layer::Layer;
 use crate::layout::{Layout, LayoutAnchorX, LayoutAnchorY, LayoutAnchorDimension};
-use crate::pasteboard::PasteboardType;
 use crate::utils::properties::ObjcProperty;
 
+#[cfg(target_os = "macos")]
+use crate::pasteboard::PasteboardType;
+
 #[cfg(target_os = "macos")]
 mod macos;
 
@@ -66,7 +68,9 @@ use ios::{register_view_class, register_view_class_with_delegate};
 mod controller;
 pub use controller::ViewController;
 
+#[cfg(target_os = "macos")]
 mod splitviewcontroller;
+#[cfg(target_os = "macos")]
 pub use splitviewcontroller::SplitViewController;
 
 mod traits;
@@ -227,9 +231,15 @@ impl<T> View<T> {
     pub fn set_background_color<C: AsRef<Color>>(&self, color: C) {
         let color: id = color.as_ref().into();
 
+        #[cfg(target_os = "macos")]
         self.objc.with_mut(|obj| unsafe {
             (&mut *obj).set_ivar(BACKGROUND_COLOR, color);
         });
+
+        #[cfg(target_os = "ios")]
+        self.objc.with_mut(|obj| unsafe {
+            let _: () = msg_send![&*obj, setBackgroundColor:color];
+        });
     }
 
 }

src/view/splitviewcontroller/mod.rs

@@ -71,7 +71,7 @@ where
     /// You'd use this if, say, you wanted a border under one part of the `SplitViewController` but
     /// not the other. This API was introduced in macOS 11.0 (Big Sur) and is a noop on anything
     /// prior.
-    #[cfg(feature = "macos")]
+    #[cfg(target_os = "macos")]
     pub fn set_titlebar_separator_style(&self, style: crate::foundation::NSInteger) {
         if os::is_minimum_version(11) {
             unsafe {

src/view/traits.rs

@@ -1,6 +1,8 @@
 //! Various traits used for Views.
 
+#[cfg(target_os = "macos")]
 use crate::dragdrop::{DragInfo, DragOperation};
+
 use crate::view::View;
 
 /// This trait can be used for implementing custom View behavior. You implement this trait on your
@@ -41,22 +43,27 @@ pub trait ViewDelegate {
 
     /// Invoked when the dragged image enters destination bounds or frame; returns dragging 
     /// operation to perform.
+    #[cfg(target_os = "macos")]
     fn dragging_entered(&self, info: DragInfo) -> DragOperation { DragOperation::None }
     
     /// Invoked when the image is released, allowing the receiver to agree to or refuse 
     /// drag operation.
+    #[cfg(target_os = "macos")]
     fn prepare_for_drag_operation(&self, info: DragInfo) -> bool { false }
 
     /// Invoked after the released image has been removed from the screen, signaling the 
     /// receiver to import the pasteboard data.
+    #[cfg(target_os = "macos")]
     fn perform_drag_operation(&self, info: DragInfo) -> bool { false }
 
     /// Invoked when the dragging operation is complete, signaling the receiver to perform
     /// any necessary clean-up.
+    #[cfg(target_os = "macos")]
     fn conclude_drag_operation(&self, info: DragInfo) {}
 
     /// Invoked when the dragged image exits the destination’s bounds rectangle (in the case 
     /// of a view) or its frame rectangle (in the case of a window object).
+    #[cfg(target_os = "macos")]
     fn dragging_exited(&self, info: DragInfo) {}
 
     //fn perform_key_equivalent(&self, event: Event) -> bool { false }