mobile-development

Mobile Development

React Native Component Structure

import { View, Text, FlatList, StyleSheet, Platform } from "react-native";
import { SafeAreaView } from "react-native-safe-area-context";

interface Product {
  id: string;
  name: string;
  price: number;
  image: string;
}

function ProductList({ products }: { products: Product[] }) {
  return (
    <SafeAreaView style={styles.container}>
      <FlatList
        data={products}
        keyExtractor={(item) => item.id}
        renderItem={({ item }) => <ProductCard product={item} />}
        contentContainerStyle={styles.list}
        ItemSeparatorComponent={() => <View style={styles.separator} />}
        ListEmptyComponent={<EmptyState message="No products found" />}
        initialNumToRender={10}
        maxToRenderPerBatch={10}
        windowSize={5}
      />
    </SafeAreaView>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: "#fff",
  },
  list: {
    padding: 16,
  },
  separator: {
    height: 12,
  },
});

Use FlatList for scrollable lists (never ScrollView with .map()). Set windowSize and maxToRenderPerBatch for large lists.

React Native Navigation

import { NavigationContainer } from "@react-navigation/native";
import { createNativeStackNavigator } from "@react-navigation/native-stack";
import { createBottomTabNavigator } from "@react-navigation/bottom-tabs";

type RootStackParams = {
  Tabs: undefined;
  ProductDetail: { productId: string };
  Cart: undefined;
};

const Stack = createNativeStackNavigator<RootStackParams>();
const Tab = createBottomTabNavigator();

function TabNavigator() {
  return (
    <Tab.Navigator screenOptions={{ headerShown: false }}>
      <Tab.Screen name="Home" component={HomeScreen} />
      <Tab.Screen name="Search" component={SearchScreen} />
      <Tab.Screen name="Profile" component={ProfileScreen} />
    </Tab.Navigator>
  );
}

function App() {
  return (
    <NavigationContainer>
      <Stack.Navigator>
        <Stack.Screen name="Tabs" component={TabNavigator} options={{ headerShown: false }} />
        <Stack.Screen name="ProductDetail" component={ProductDetailScreen} />
        <Stack.Screen name="Cart" component={CartScreen} options={{ presentation: "modal" }} />
      </Stack.Navigator>
    </NavigationContainer>
  );
}