iOS

iOS Project Setup

This guide covers setting up an iOS Blinc project — toolchain, build commands, and the platform-specific files (Info.plist, Xcode configuration, debugging).

For the cross-platform Blinc API (native bridge, camera, deep linking, lifecycle, etc.), see the Mobile Development overview.

Prerequisites

1. Xcode

Install Xcode 15+ from the App Store.

xcode-select -p

2. Rust Targets

rustup target add aarch64-apple-ios        # Device
rustup target add aarch64-apple-ios-sim    # Simulator (Apple Silicon)
rustup target add x86_64-apple-ios         # Simulator (Intel)

Building

Create a build script build-ios.sh:

#!/bin/bash
set -e
MODE=${1:-debug}
PROJECT_NAME="my_app"
[ "$MODE" = "release" ] && CARGO_FLAGS="--release" || CARGO_FLAGS=""
TARGET_DIR=$([ "$MODE" = "release" ] && echo "release" || echo "debug")

cargo build --target aarch64-apple-ios $CARGO_FLAGS
cargo build --target aarch64-apple-ios-sim $CARGO_FLAGS

mkdir -p platforms/ios/libs/{device,simulator}
cp target/aarch64-apple-ios/$TARGET_DIR/lib${PROJECT_NAME}.a \
   platforms/ios/libs/device/
cp target/aarch64-apple-ios-sim/$TARGET_DIR/lib${PROJECT_NAME}.a \
   platforms/ios/libs/simulator/

./build-ios.sh         # debug
./build-ios.sh release

Then open platforms/ios/BlincApp.xcodeproj in Xcode and press Cmd+R.

Project Configuration

Cargo.toml

[lib]
name = "my_app"
crate-type = ["cdylib", "staticlib"]

[target.'cfg(target_os = "ios")'.dependencies]
blinc_app = { version = "0.5", features = ["ios"] }
blinc_platform_ios = "0.5"

Xcode Build Settings

1. Link static library: Build Phases → Link Binary With Libraries → add libmy_app.a from libs/device/ or libs/simulator/
2. Bridging header: Build Settings → Objective-C Bridging Header → BlincApp/Blinc-Bridging-Header.h
3. Frameworks:
   • Metal.framework
   • MetalKit.framework
   • QuartzCore.framework
   • AVFoundation.framework (camera/audio)
   • CoreHaptics.framework (haptics)

Info.plist

<!-- Camera + microphone permissions for native bridge features -->
<key>NSCameraUsageDescription</key>
<string>This app uses the camera for photo capture.</string>
<key>NSMicrophoneUsageDescription</key>
<string>This app records audio.</string>

<!-- Deep link URL scheme -->
<key>CFBundleURLTypes</key>
<array>
    <dict>
        <key>CFBundleURLSchemes</key>
        <array><string>myapp</string></array>
    </dict>
</array>

Bridging Header

The bridging header (Blinc-Bridging-Header.h) declares the C FFI surface Swift uses to call Rust:

// Context lifecycle
IOSRenderContext* blinc_create_context(uint32_t width, uint32_t height, double scale);
void blinc_destroy_context(IOSRenderContext* ctx);

// Rendering
bool blinc_needs_render(IOSRenderContext* ctx);
void blinc_build_frame(IOSRenderContext* ctx);
bool blinc_render_frame(IOSGpuRenderer* gpu);

// Input
void blinc_handle_touch(IOSRenderContext* ctx, uint64_t id, float x, float y, int32_t phase);

// Deep linking + keyboard (see Mobile overview for usage)
void blinc_ios_handle_deep_link(const char* uri);
void blinc_ios_set_keyboard_inset(IOSRenderContext* ctx, float inset);

The BlincViewController template manages the CADisplayLink, CAMetalLayer, and touch event forwarding to Rust.

Debugging

Console Logs

View Rust logs in Xcode's console or Console.app with a filter:

subsystem:com.blinc.my_app

Common Issues

"Library not found: -lmy_app" — run ./build-ios.sh first.

Black screen on simulator —

1. Verify the right simulator target (aarch64-apple-ios-sim for Apple Silicon, x86_64-apple-ios for Intel)
2. Verify the static library is in libs/simulator/
3. Check Xcode console for Metal initialization errors

Touch events not working —

1. Verify blinc_create_context succeeds (check console)
2. Ensure ios_app_init() is called before creating the context
3. Touch coordinates must be in logical points, not physical pixels

Native call failed — verify Swift handler is registered with matching namespace.name. Check that BlincNativeBridge.shared.connectToRust() was called at app launch.

Performance

[profile.release]
lto = "fat"
opt-level = "z"
panic = "abort"
strip = true
codegen-units = 1

• Test on real devices — simulators use software rendering for some Metal operations
• Profile with Instruments — use the Metal System Trace template for GPU analysis

Next Steps

• Mobile Development overview — native bridge, camera, deep linking, lifecycle, safe area APIs
• Android Project Setup — build the Android counterpart
• CLI Reference