My commit for the repo built in rust called Cacao

Cargo.toml

@@ -99,3 +99,6 @@ required-features = ["appkit"]
 [[example]]
 name = "window_controller"
 required-features = ["appkit"]
+[[exmaple]]
+name = "safe_area"
+required-features = ["appkit"]

examples/readme.md

@@ -40,6 +40,11 @@ This example showcases text input, and logs it to the underlying console. It's m
 
 `cargo run --example text_input`
 
+## Safe Area
+This example showcases A window containg the text "Hello, world!" while keeping everything in the safearea to keep it visible.
+
+`cargo run --example safe_area`
+
 ## Calculator
 A Rust-rendition of the macOS Calculator app.
 

examples/safe_area.rs

@@ -0,0 +1,63 @@
+//! This example showcases setting up a basic application and view with safe area constraints.
+
+use cacao::appkit::window::Window;
+use cacao::appkit::{App, AppDelegate};
+use cacao::layout::{Layout, LayoutConstraint};
+use cacao::text::{Font, Label};
+use cacao::view::{View, ViewDelegate};
+
+struct BasicApp {
+    window: Window,
+    content_view: View<ContentView>
+}
+
+impl AppDelegate for BasicApp {
+    fn did_finish_launching(&self) {
+        App::activate();
+
+        self.window.set_minimum_content_size(400., 400.);
+        self.window.set_title("Safe Area Demo");
+        self.window.set_content_view(&self.content_view);
+        self.window.show();
+    }
+
+    fn should_terminate_after_last_window_closed(&self) -> bool {
+        true
+    }
+}
+
+#[derive(Default)]
+struct ContentView {
+    content: View,
+    label: Label
+}
+
+impl ViewDelegate for ContentView {
+    const NAME: &'static str = "SafeAreaView";
+
+    fn did_load(&mut self, view: View) {
+        let font = Font::system(30.);
+        self.label.set_font(&font);
+        self.label.set_text("Hello World");
+        self.label.set_text_color(cacao::color::Color::rgb(255, 255, 255));
+
+        self.content.add_subview(&self.label);
+        view.add_subview(&self.content);
+
+        // Add layout constraints to be 100% excluding the safe area
+        // Do last because it will crash because the view needs to be inside the hierarchy
+        cacao::layout::LayoutConstraint::activate(&[
+            self.content.top.constraint_equal_to(&view.safe_layout_guide.top),
+            self.content.leading.constraint_equal_to(&view.safe_layout_guide.leading),
+            self.content.trailing.constraint_equal_to(&view.safe_layout_guide.trailing),
+            self.content.bottom.constraint_equal_to(&view.safe_layout_guide.bottom),
+        ])
+    }
+}
+
+fn main() {
+    App::new("com.test.window", BasicApp {
+        window: Window::default(),
+        content_view: View::with(ContentView::default())
+    }).run();
+}

src/appkit/window/mod.rs

@@ -205,6 +205,19 @@ impl<T> Window<T> {
         }
     }
 
+    /// Sets the subtitle (smaller text bellow the title on unified and expanded title bars) on the 
+    /// underlying window. When this property is an empty string, the system removes the subtitle
+    /// from the window layout. Allocates and passes an `NSString` over to the Objective C runtime.
+    /// Does nothing when less than version 11.
+    pub fn set_subtittle(&self, subtitle: &str) {
+        if !os::is_minimum_version(11) return;
+
+        unsafe {
+            let subtitle = NSString::new(subtitle);
+            let _: () = msg_send![&*self.objc, setTitle: title];
+        }
+    }
+
     /// Sets the title visibility for the underlying window.
     pub fn set_title_visibility(&self, visibility: TitleVisibility) {
         unsafe {