---

name: ios-dev description: iOS/React Native development with Expo. Use when working on mobile app, running builds, debugging device issues, or setting up development environment including tethering.

iOS Development Guide

Project Structure

Copymobile/
├── app/                    # Expo Router pages
│   ├── _layout.tsx
│   ├── index.tsx           # Home screen
│   └── room/[id].tsx       # Voice call room
├── src/
│   ├── components/         # UI components
│   ├── hooks/              # Custom hooks (WebRTC, Socket, Speech)
│   └── types/
├── ios/                    # Native iOS project (generated by prebuild)
└── .env                    # Environment variables

Key Commands

Copycd mobile

# Development (WiFi - same network as Mac)
npx expo start --dev-client

# Development (Tethering - requires tunnel)
npx expo start --dev-client --tunnel

# Build for specific device
npx expo run:ios --device "DEVICE_NAME"

# Clean rebuild (after config changes)
npx expo prebuild --platform ios --clean

# List available devices
xcrun xctrace list devices

Environment Configuration

Copy# WiFi development
EXPO_PUBLIC_SIGNALING_SERVER_URL=http://192.168.x.x:3001

# Production (Render server)
EXPO_PUBLIC_SIGNALING_SERVER_URL=https://webrtc-signaling-xxxx.onrender.com

Tethering Development

When Mac is connected to iPhone's Personal Hotspot:

1. Problem: iPhone cannot directly access devices on its own hotspot
2. Solution: Use ngrok tunnel

Copy# Install ngrok (first time)
npm install -g @expo/ngrok@^4.1.0

# Start with tunnel
npx expo start --dev-client --tunnel

# Get tunnel URL
curl -s http://127.0.0.1:4040/api/tunnels | grep -o '"public_url":"https://[^"]*"'

Important: Use HTTPS URL (iOS App Transport Security requirement)

Troubleshooting

Development Workflow

1. Start signaling server: cd server && npm run dev
2. Start Metro: cd mobile && npx expo start --dev-client
3. Open app on iPhone, enter Metro URL
4. For code changes: Hot reload automatic
5. For native changes: Rebuild with npx expo run:ios --device