React Native验证码倒计时工具类分享

/
  Created by zhuang.haipeng on 2017.9.11
 
  广告倒计时,验证码倒计时工具类
 
  用法: //60  1000 为60秒 , 60  60  100 为60分钟 ...
  let countdownDate = new Date(new Date().getTime() + 60  1000)
   CountdownUtil.settimer(countdownDate, (time) => {
    Console.log(time) --> {years: 0, days: 0, hours: 0, min: 0, sec: 49, millisec: 0}
   }
 
   切记: 在应用工具类的页面退出的时候, 调用CountdownUtil.s() 清除定时器,以免内存爆了
 /

export default class CountdownUtil {

  / 定时器 /
  interval = null;

  /
    创建定时器
   
   /
  static settimer(countdownDate, callbak) {
    this.interval = setInterval(() => {
      let time = this.getDateData(countdownDate)
      callbak && callbak(time)
    }, 1000)
  }


  /
    侄计时计算 --> 通过此方法计算,可以解决应用退出后台的时候,定时器不走
    @param countdownDate
    @return {}
   /
  static getDateData(countdownDate) {
    let diff = (Date.parse(new Date(countdownDate)) - Date.parse(new Date)) / 1000;

    if (diff <= 0) {
     this.s() // 倒计时为0的时候, 将计时器清除
      return 0;
    }

    const timeLeft = {
      years: 0,
      days: 0,
      hours: 0,
      min: 0,
      sec: 0,
      millisec: 0,
    };

    if (diff >= (365.25  86400)) {
      timeLeft.years = Math.floor(diff / (365.25  86400));
      diff -= timeLeft.years  365.25  86400;
    }
    if (diff >= 86400) {
      timeLeft.days = Math.floor(diff / 86400);
      diff -= timeLeft.days  86400;
    }
    if (diff >= 3600) {
      timeLeft.hours = Math.floor(diff / 3600);
      diff -= timeLeft.hours  3600;
    }
    if (diff >= 60) {
      timeLeft.min = Math.floor(diff / 60);
      diff -= timeLeft.min  60;
    }
    timeLeft.sec = diff;
    return timeLeft;
  }

  /
    数字补零 --> 例: 00时01分59秒
    @param num
    @param length
    @return {}
   /
  static leadingZeros(num, length = null) {

    let length_ = length;
    let num_ = num;
    if (length_ === null) {
      length_ = 2;
    }
    num_ = String(num_);
    while (num_.length < length_) {
      num_ = '0' + num_;
    }
    return num_;
  }

  / 清除定时器 /
  static s() {
    clearInterval(this.interval);
  }
};

 if (this.state.isSentVerify === true) {
      // 倒计时时间
      let countdownDate = new Date(new Date().getTime() + 60  1000)
      // 点击之后验证码不能发送网络请求
      this.setState({
        isSentVerify: false
      });

      Api.userRegisterCheckCode(this.state.phoneText)
        .then(
          (data) => { // 倒计时时间
            CountdownUtil.settimer(countdownDate, (time) => {
              this.setState({
                timerTitle: time.sec > 0 ? time.sec + 's' : '重新获取'
              }, () => {
                if (this.state.timerTitle == "重新获取") {
                  this.setState({
                    isSentVerify: true
                  })
                }
              })
            })
          }
        ).catch((err) => {
        this.setState({
          isSentVerify: true,
        })
      });
}

 ponentWillUnmount() {
    CountdownUtil.s()
  }