react-native-mobile

React Native Mobile Development

Level 1: Quick Reference (~700-900 tokens) Level 2: Implementation Guide (~4000-5000 tokens) Level 3: Deep Dive Resources (external links)

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Level 1: Quick Reference

Core Components

import { View, Text, ScrollView, FlatList, Image, TouchableOpacity } from 'react-native';

// Basic Layout
<View style={styles.container}>
  <Text style={styles.title}>Hello World</Text>
  <Image source={require('./logo.png')} style={styles.image} />
  <TouchableOpacity onPress={handlePress}>
    <Text>Press Me</Text>
  </TouchableOpacity>
</View>

// List Rendering (Performance Optimized)
<FlatList
  data={items}
  renderItem={({ item }) => <ItemCard item={item} />}
  keyExtractor={item => item.id}
  onEndReached={loadMore}
  onEndReachedThreshold={0.5}
/>

// Scrollable Content
<ScrollView contentContainerStyle={styles.scrollContent}>
  {/* Long content */}
</ScrollView>

Navigation (React Navigation v6)

// Stack Navigator
import { NavigationContainer } from '@react-navigation/native';
import { createNativeStackNavigator } from '@react-navigation/native-stack';

const Stack = createNativeStackNavigator();

function App() {
  return (
    <NavigationContainer>
      <Stack.Navigator>
        <Stack.Screen name="Home" component={HomeScreen} />
        <Stack.Screen name="Details" component={DetailsScreen} />
      </Stack.Navigator>
    </NavigationContainer>
  );
}

// Navigate Between Screens
navigation.navigate('Details', { itemId: 42 });
navigation.goBack();

Styling

import { StyleSheet } from 'react-native';

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    alignItems: 'center',
    justifyContent: 'center',
  },
  text: {
    fontSize: 16,
    color: '#333',
    fontWeight: 'bold',
  },
});

Platform-Specific Code

import { Platform } from 'react-native';

const styles = StyleSheet.create({
  container: {
    marginTop: Platform.OS === 'ios' ? 20 : 0,
    ...Platform.select({
      ios: { shadowColor: '#000', shadowOffset: { width: 0, height: 2 } },
      android: { elevation: 4 },
    }),
  },
});

// Platform-specific files
// Button.ios.tsx
// Button.android.tsx