最近在学习React Native跨平台开发,如何从头开始开发第一个基础应用并打包发布:
npx react-native init MyProject
Android 版:
npx react-native run-android
对于 iOS:
npx react-native run-ios
打开App.js,替换默认内容,创建一个简单的Hello World组件:
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
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
然后创建导航结构:
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;
在screens目录下创建HomeScreen.js和DetailsScreen.js,并编写相应的组件。
npm install axios
在组件中发送请求:
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;
使用 Redux 或 MobX 进行状态管理。这里我们以 Redux 为例:
npm install redux react-redux npm install @reduxjs/toolkit
创建store、actions和reducers,然后在App.js中设置Provider:
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
给组件添加动画效果:
从 'react' 导入 React; 从“react-native”导入{动画、视图、文本}; 从“react-native-reanimated”导入{插值}; const App = () =>; { const animatedValue = new Animated.Value(0); const 不透明度 = 插值(animatedValue, { 输入范围: [0, 1], 输出范围: [0, 1], }); 常量动画样式 = { 不透明度, }; 返回 ( <h3> 14、性能优化 </h3>
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