将工程中app.js修改为如下保存,用xcode 打开工程跑起来了
import React, { Component } from 'react';
import {
Platform,
StyleSheet,
Text,
View
} from 'react-native';
const instructions = Platform.select({
ios: 'Hello World iOS',
android: 'Hello World android',
});
type Props = {};
export default class App extends Component<Props> {
render() {
return (
<View style={styles.container}>
<Text style={styles.instructions}>
{instructions}
</Text>
</View>
);
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#F5FCFF',
},
instructions: {
textAlign: 'center',
color: '#333333',
marginBottom: 5,
},
});
