import React, { Component } from 'react'; import { AppRegistry, StyleSheet, Text, View } from 'react-native'; export default class MsgPopPage extends Component { render() { return ( <View style={styles.container}> <Text style={styles.msg}>Hello MSG</Text> <View style={styles.triangle}> </View> </View> ); } } const styles = StyleSheet.create({ container: { flex: 1, flexDirection: 'row', justifyContent: 'center', alignItems: 'center', backgroundColor: '#F5FCFF', }, msg: { fontSize: 20, textAlign: 'center', padding: 10, backgroundColor: 'chartreuse', borderRadius: 8, }, triangle: { width: 0, height: 0, backgroundColor: 'transparent', borderStyle: 'solid', borderLeftWidth: 30, borderRightWidth: 30, borderBottomWidth: 8, borderTopWidth: 8, borderLeftColor: 'chartreuse', borderRightColor: 'transparent', borderTopColor: 'transparent', borderBottomColor: 'transparent', }, });

import React, {Component} from 'react'; export default class Timer extends Component { componentWillMount() { const {interval} = this.props; this.timer = setInterval(this.onEvent, interval); } componentWillReceiveProps(newProps) { if (newProps.interval !== this.props.interval) { clearInterval(this.timer); this.timer = setInterval(this.onEvent, newProps.interval); } } componentWillUnmount() { clearInterval(this.timer); } onEvent = ev => { const { onTimer } = this.props; onTimer(ev); }; render(){ return this.props.children || null; } }

import React from 'react'; import { Text, View, StyleSheet, Alert,
} 
from 'react-native'; import Timer from './Timer' export default class TimeMsg extends React.Component { constructor(props){ super(props); this.state={ count:10, isFinish:false, } } onTimer = () => { if(this.state.count>0){ this.setState({count: this.state.count - 1}); }else { this.setState({isFinish:true}); } }; againTime=()=>{ if(this.state.isFinish){ this.setState({ count:10, isFinish:false, }); //回调，当使用组件时，可用传入回调事件 if(this.props.onPress){ this.props.onPress(); } } } render() { let mainView=this.state.count!=0? <Text style={styles.textMsg}>剩余{this.state.count}s</Text>: <Text style={styles.textMsg} onPress={this.againTime}>重新获取</Text> return ( <View style={styles.container}> <View style={styles.mainView}> <Timer interval={1000} onTimer={this.onTimer}/> {mainView} </View> </View> ); } } const styles=StyleSheet.create({ container:{ backgroundColor:'#4a4a4a', }, textMsg:{ fontSize:16, }, mainView:{ height: 44, padding: 12, } })

//回调事件
againTime=()=>{
alert("againTime");
}
//倒计时结束时，可以使用此回调再次开始计时，并执行某些时间
<TimeMsg onPress={ this.againTime }/>