Implement stub for [UIFont systemFontOfSize:]

src/frameworks/uikit.rs

@@ -10,6 +10,7 @@ use crate::export_c_func;
 pub mod ui_accelerometer;
 pub mod ui_application;
 pub mod ui_device;
+pub mod ui_font;
 pub mod ui_nib;
 pub mod ui_responder;
 pub mod ui_screen;

src/frameworks/uikit/ui_font.rs

@@ -0,0 +1,33 @@
+//! `UIFont`.
+
+use crate::frameworks::core_graphics::CGFloat;
+use crate::objc::{autorelease, id, objc_classes, ClassExports, HostObject};
+
+struct UIFontHostObject {
+    _size: CGFloat,
+}
+impl HostObject for UIFontHostObject {}
+
+pub const CLASSES: ClassExports = objc_classes! {
+
+(env, this, _cmd);
+
+// For now this is a singleton (the only instance is returned by mainScreen),
+// so there are hardcoded assumptions related to that.
+@implementation UIFont: NSObject
+
++ (id)systemFontOfSize:(CGFloat)font_size {
+    // TODO: actually load and render fonts
+    let new = env.objc.alloc_object(
+        this,
+        Box::new(UIFontHostObject {
+            _size: font_size,
+        }),
+        &mut env.mem
+    );
+    autorelease(env, new)
+}
+
+@end
+
+};

src/objc/classes/class_lists.rs

@@ -24,6 +24,7 @@ pub const CLASS_LISTS: &[super::ClassExports] = &[
     opengles::eagl::CLASSES,
     uikit::ui_accelerometer::CLASSES,
     uikit::ui_application::CLASSES,
+    uikit::ui_font::CLASSES,
     uikit::ui_nib::CLASSES,
     uikit::ui_responder::CLASSES,
     uikit::ui_screen::CLASSES,