uikit

Typed UIKit bindings for building native iOS apps, the sibling of appkit on the desktop. Like appkit, it is ObjC-runtime FFI: real UIView objects, closure-free callbacks, and owned wrappers that release in drop. Build it for the iOS targets with --target ios-arm64 (see Targets & cross-compilation).

The umbrella uikit module re-exports a full surface, organized like appkit's:

• Core — Window, ViewController, View, Label, Color, Screen, and app-delegate synthesis.
• Controls — Button, Slider, Switch, SegmentedControl, ProgressView, ActivityIndicator, PageControl, DatePicker.
• Text — TextField, SecureTextField, TextView, SearchBar.
• Containers & data — stack/scroll containers, TableView, CollectionView, PickerView.
• Graphics — ImageView, Image, Font, BezierPath, and custom-view synthesis (drawRect:).
• Navigation & chrome — AlertController, toolbar, navigation / tab / split / page controllers, the pasteboard, Auto Layout anchors, events, and notifications.

Entry point and build

iOS apps enter through UIKit, so a C+ app exports cplus_app_main and the Xcode target keeps a two-line C main shim that calls it; the C+ side registers the app delegate and enters UIApplicationMain:

extern int cplus_app_main(int, char **);
int main(int argc, char **argv) { return cplus_app_main(argc, argv); }

cpc build --target ios-arm64 emits a staticlib (object + archive + C header); Xcode owns the final link, exactly as described on the targets page. A C+-driven screen (a white window with a centered label) has rendered on the iPhone 16 Pro simulator. For the Objective-C message-send mechanics underneath, see FFI.