利用React-Native怎么实现一个验证码倒计时按钮

利用React-Native怎么实现一个验证码倒计时按钮？相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。

开发过程中有获取手机验证码的场景，这时候有这样的要求：

1，点击“获取验证码”的按钮，发起获取验证码的网络请求，同时按钮置为不可用

2，如果网络请求成功，按钮继续不可用，但按钮上文本改为倒计时((*s)后重新获取)

3，如果网络请求失败，按钮置为可用

4，倒计时结束，按钮可用

源码：

import React,{PropTypes} from 'react';import {View,Text,TouchableOpacity} from 'react-native';export default class TimerButton extends React.Component {  constructor(props) {   super(props)    this.state = {      timerCount: this.props.timerCount || 90,      timerTitle: this.props.timerTitle || '获取验证码',      counting: false,      selfEnable: true,    };    this._shouldStartCountting = this._shouldStartCountting.bind(this)    this._countDownAction = this._countDownAction.bind(this)  }  static propTypes = {   style: PropTypes.object,   textStyle: Text.propTypes.style,   onClick: PropTypes.func,   disableColor: PropTypes.string,   timerTitle: PropTypes.string,   enable: React.PropTypes.oneOfType([React.PropTypes.bool,React.PropTypes.number])  };  _countDownAction(){    const codeTime = this.state.timerCount;    this.interval = setInterval(() =>{      const timer = this.state.timerCount - 1      if(timer===0){        this.interval&&clearInterval(this.interval);        this.setState({          timerCount: codeTime,          timerTitle: this.props.timerTitle || '获取验证码',          counting: false,          selfEnable: true        })      }else{        console.log("---- timer ",timer);        this.setState({          timerCount:timer,          timerTitle: `重新获取(${timer}s)`,        })      }    },1000)  }  _shouldStartCountting(shouldStart){    if (this.state.counting) {return}    if (shouldStart) {      this._countDownAction()      this.setState({counting: true,selfEnable:false})    }else{      this.setState({selfEnable:true})    }  }  componentWillUnmount(){    clearInterval(this.interval)  }  render(){    const {onClick,style,textStyle,enable,disableColor} = this.props    const {counting,timerTitle,selfEnable} = this.state    return (      <TouchableOpacity activeOpacity={counting &#63; 1 : 0.8} onPress={()=>{        if (!counting && enable && selfEnable) {          this.setState({selfEnable:false})          this.props.onClick(this._shouldStartCountting)        };      }}>        <View style={[{width:100, height:44,flex:1,justifyContent:'center',alignItems:'center'},style]}>          <Text style={[{fontSize: 16},textStyle,{color: ((!counting && enable && selfEnable) &#63; textStyle.color : disableColor || 'gray')}]}>{timerTitle}</Text>        </View>      </TouchableOpacity>    )  }}