React Native - App

如果您打开默认应用程序，您可以观察到 app.js 文件如下所示

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

export default class App extends React.Component {
   render() {
      return (
         <View style = {styles.container}>
            <Text>Open up App.js to start working on your app!</Text>
            <Text>Changes you make will automatically reload.</Text>
            <Text>Shake your phone to open the developer menu.</Text>
         </View>
      );
   }
}

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

输出

Hello world

要显示一条简单消息"欢迎来到 Tutorialspoint"，请删除 CSS 部分，并将要打印的消息插入 <text></text> 标签内 <view></view> 中，如下所示。

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

export default class App extends React.Component {
   render() {
      return (
         <View>
            <Text>Welcome to Tutorialspoint</Text>
         </View>
      );
   }
}