React Native plattformübergreifende Entwicklungspraxis: von Null auf Eins

npx react-native init MyProject

npx react-native run-android

npx react-native run-ios

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

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



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



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  7. Install third-party libraries
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<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

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

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



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  9. Run and test After each modification, rerun the application to see the changes.
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  10. Add routing and navigation
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<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

    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;

    npm install axios

    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;

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

    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;

    npm install react-native-reanimated

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

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

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

      constanimatedStyle = {
        Opazität,
      };

      zurückkehren (
        <Animierte.Ansicht>



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  14. Leistungsoptimierung
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