React Native cross-platform development practice: from zero to one

I'm learning React Native cross-platform development recently, how to develop the first basic application from scratch and package it for release:

1. Environment preparation

• Install Node.js
• Install React Native CLI
• Set up Android or iOS development environment (depending on the platform you want to support)

2. Create a new project Use React Native CLI to create a new project:

npx react-native init MyProject

3. Check the project structure The new project will contain the following key files and directories:

• index.js: the entry point of the application
• App.js: the main components of the application
• android and ios directories: contain project configurations for Android and iOS platforms respectively
• package.json: project dependencies and metadata

4. Run the application

For Android:

npx react-native run-android

For iOS:

npx react-native run-ios

5. Write your first component

Open App.js, replace the default content, and create a simple Hello World component:

   import React from 'react';
   import { View, Text } from 'react-native';

   const App = () => {
     return (
       <View>



<h3>
  
  
  6. Add styles You can add CSS styles in App.js or in a separate styles.js file:
</h3>



<pre class="brush:php;toolbar:false">   import React from 'react';
   import { View, Text, StyleSheet } from 'react-native';

   const styles = StyleSheet.create({
     container: {
       flex: 1,
       justifyContent: 'center',
       alignItems: 'center',
       backgroundColor: '#F5FCFF',
     },
   });

   const App = () => {
     return (
       <View>



<h3>
  
  
  7. Install third-party libraries
</h3>

<p>Suppose we want to use the react-native-vector-icons library to add icons:<br>
</p>

<pre class="brush:php;toolbar:false">   npm install react-native-vector-icons
   npx react-native link react-native-vector-icons

8. Use third-party libraries to update App.js to import icons:

   import React from 'react';
   import { View, Text } from 'react-native';
   import Icon from 'react-native-vector-icons/Ionicons';

   const App = () => {
     return (
       <View>



<h3>
  
  
  9. Run and test After each modification, rerun the application to see the changes.
</h3>

<h3>
  
  
  10. Add routing and navigation
</h3>

<p>In order to jump between pages in the application, we can use the react-navigation library. First install:<br>
</p>

<pre class="brush:php;toolbar:false">    npm install @react-navigation/native
    npm install react-native-reanimated react-native-gesture-handler react-native-screens react-native-safe-area-context @react-native-community/masked-view

Then create the navigation structure:

    import React from 'react';
    import { NavigationContainer } from '@react-navigation/native';
    import { createStackNavigator } from '@react-navigation/stack';
    import HomeScreen from './screens/HomeScreen';
    import DetailsScreen from './screens/DetailsScreen';

    const Stack = createStackNavigator();

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

    export default App;

Create HomeScreen.js and DetailsScreen.js in the screens directory and write the corresponding components.

11. Network request Use the axios library to make HTTP requests:

    npm install axios

Sending a request in a component:

    import React, { useState, useEffect } from 'react';
    import axios from 'axios';

    const HomeScreen = () => {
      const [data, setData] = useState([]);

      useEffect(() => {
        axios.get('https://jsonplaceholder.typicode.com/posts')
          .then(response => setData(response.data))
          .catch(error => console.error(error));
      }, []);

      return (
        // 渲染数据
      );
    };

    export default HomeScreen;

12. State management

Use Redux or MobX for state management. Here we take Redux as an example:

    npm install redux react-redux
    npm install @reduxjs/toolkit

Create a store, actions, and reducers, then set the Provider in App.js:

    import React from 'react';
    import { Provider } from 'react-redux';
    import store from './store';

    const App = () => {
      return (
        <Provider store={store}>
          {/* Other codes */}
        </Provider>
      );
    };

    export default App;

13. Animation Use the react-native-reanimated library to implement animation:

    npm install react-native-reanimated

Add animation effects to components:

    import React from 'react';
    import { Animated, View, Text } from 'react-native';
    import { interpolate } from 'react-native-reanimated';

    const App = () => {
      const animatedValue = new Animated.Value(0);

      const opacity = interpolate(animatedValue, {
        inputRange: [0, 1],
        outputRange: [0, 1],
      });

      const animatedStyle = {
        opacity,
      };

      return (
        <Animated.View>



<h3>
  
  
  14. Performance optimization
</h3>

• Use PureComponent or React.memo to reduce unnecessary rendering
• Use FlatList or SectionList to optimize long lists
• Use shouldComponentUpdate or useMemo, useCallback lifecycle methods
• Optimize network requests and image loading
• Use AsyncStorage or redux-persist to save state when appropriate

15. Release the app

• Android: Generate a signed APK and upload it to Google Play Console
• iOS: Configure Xcode and submit it to App Store Connect

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