Warning

Deeply WIP project!

Main goal is to create a UI framework that tries to mimic Apple's UIKit as much as possible, so any iOS developer will be able to start using it without learning things from scratch and be as much portable as possible supporting various of platforms.

Current state:

• Skia Graphite powered renderer
• SDL 3.4 platform integration, including the UIScene lifecycle on iOS and the devkitPro libnx backend on Nintendo Switch
• Platforms supported:
  • iOS
  • macOS
  • Nintendo Switch (LibNX)
• Core implementation:
  • CALayer (rendering hierarchy)
  • Yoga flex auto layout
  • Animation system
  • Responder chain (touch propagation)
  • Focus system (basic gamepad input support)
  • UITraitCollection (dark mode)

More screenshots

TODO:

• UIViewController presentation
• Interface Builder
• A lot of things tbh ...

Build

Initialize the dependencies first:

git submodule update --init --recursive

Skia must first be compiled with Graphite. Apple platforms use Graphite's native Metal backend; Nintendo Switch uses Graphite through Dawn's OpenGL ES compatibility backend.

Switch:

bin/gn gen out/horizon --args='is_official_build=false target_cpu="arm64" target_os="horizon" skia_enable_graphite=true skia_enable_ganesh=false skia_use_dawn=true skia_use_gl=false skia_use_metal=false skia_use_vulkan=false is_trivial_abi=true is_debug=false'
ninja -C out/horizon skia skparagraph

iOS:

bin/gn gen out/ios-arm64 --args='is_official_build=false target_cpu="arm64" target_os="ios" ios_min_target="15.0" skia_enable_graphite=true skia_enable_ganesh=false skia_use_gl=false skia_use_metal=true is_trivial_abi=true is_debug=false'
ninja -C out/ios-arm64 skia skparagraph

macOS:

bin/gn gen out/mac-arm64 --args='is_official_build=false target_cpu="arm64" skia_enable_graphite=true skia_enable_ganesh=false skia_use_gl=false skia_use_metal=true is_trivial_abi=true is_debug=false'
ninja -C out/mac-arm64 skia skparagraph

To build project:

Switch:

cmake -S Demo -B Demo/build/switch -DPLATFORM_SWITCH=ON
cmake --build Demo/build/switch --target ThorVGApp.nro -j
nxlink Demo/build/switch/ThorVGApp.nro

iOS:

cmake -S Demo -B Demo/build/ios -G Xcode -DPLATFORM_IOS=ON
open Demo/build/ios/ThorVGApp.xcodeproj

macOS:

cmake -S Demo -B Demo/build/macos -DPLATFORM_DESKTOP=ON
cmake --build Demo/build/macos --target ThorVGApp -j