search
HomeWeb Front-endJS TutorialReact Native implements verification code countdown function

This time I will bring you React Native to implement Verification codeCountdown function, what are the precautions for React Native to implement verification code countdown function , the following is a practical case, let’s take a look.

Because I used timer before and did not calculate the current time. Every time I exited the program, the timer never ran. This tool class simply solves the problem of exiting the program from the background and timing. If the bug does not work, then just upload the code~~

/**
 * 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.stop() 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 = (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 <p style="text-align: left;">
Use callback to pass the converted time countdown. You can print the time object returned by callbak</p><p style="text-align: left;">
Here is a simple example of the verification code countdown: </p><p style="text-align: left;">
<strong>Thoughts: </strong></p><p style="text-align: left;">
1. First set the state machine isSentVerify to be true by default to send the verification code <br>2. After clicking, reset the state machine isSentVerify to false to prevent the user from clicking again to send a network request <br>3. Declare the countdown time (only here It can only be declared when you click it. If you are in componentDidMount, the time will start as soon as you enter) <br>4. Set the countdown after the request is successful. If time.sec > 0, set the time, otherwise the text will be set. Set it to "Reacquire" <br>5. Then determine the text as "Reacquire", and then set the state machine isSentVerify to true, so that the user can send the verification code again after the countdown is over. <br>6. When the network request fails, set isSentVerify to true at the catch point so that the user can obtain the verification code again</p><pre class="brush:php;toolbar:false"> 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,
        })
      });
    }

When exiting the page, remember to destroy the timer

 componentWillUnmount() {
    CountdownUtil.stop()
  }

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website!

Recommended reading:



The above is the detailed content of React Native implements verification code countdown function. For more information, please follow other related articles on the PHP Chinese website!

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
react中canvas的用法是什么react中canvas的用法是什么Apr 27, 2022 pm 03:12 PM

在react中,canvas用于绘制各种图表、动画等;可以利用“react-konva”插件使用canvas,该插件是一个canvas第三方库,用于使用React操作canvas绘制复杂的画布图形,并提供了元素的事件机制和拖放操作的支持。

react中antd和dva是什么意思react中antd和dva是什么意思Apr 21, 2022 pm 03:25 PM

在react中,antd是基于Ant Design的React UI组件库,主要用于研发企业级中后台产品;dva是一个基于redux和“redux-saga”的数据流方案,内置了“react-router”和fetch,可理解为应用框架。

React是双向数据流吗React是双向数据流吗Apr 21, 2022 am 11:18 AM

React不是双向数据流,而是单向数据流。单向数据流是指数据在某个节点被改动后,只会影响一个方向上的其他节点;React中的表现就是数据主要通过props从父节点传递到子节点,若父级的某个props改变了,React会重渲染所有子节点。

Java中Native修饰符的使用方法Java中Native修饰符的使用方法Apr 22, 2023 pm 03:46 PM

Native修饰符的使用native主要用于方法上1、一个native方法就是一个Java调用非Java代码的接口。一个native方法是指该方法的实现由非Java语言实现,比如用C或C++实现。2、在定义一个native方法时,并不提供实现体(比较像定义一个JavaInterface),因为其实现体是由非Java语言在外面实现的。说明Java语言本身不能对操作系统底层进行访问和操作,但是可以通过JNI接口调用其他语言来实现对底层的访问。JNI是Java本机接口(JavaNativeInterf

react中为什么使用nodereact中为什么使用nodeApr 21, 2022 am 10:34 AM

因为在react中需要利用到webpack,而webpack依赖nodejs;webpack是一个模块打包机,在执行打包压缩的时候是依赖nodejs的,没有nodejs就不能使用webpack,所以react需要使用nodejs。

react中forceupdate的用法是什么react中forceupdate的用法是什么Apr 19, 2022 pm 12:03 PM

在react中,forceupdate()用于强制使组件跳过shouldComponentUpdate(),直接调用render(),可以触发组件的正常生命周期方法,语法为“component.forceUpdate(callback)”。

react是组件化开发吗react是组件化开发吗Apr 22, 2022 am 10:44 AM

react是组件化开发;组件化是React的核心思想,可以开发出一个个独立可复用的小组件来构造应用,任何的应用都会被抽象成一颗组件树,组件化开发也就是将一个页面拆分成一个个小的功能模块,每个功能完成自己这部分独立功能。

react和reactdom有什么区别react和reactdom有什么区别Apr 27, 2022 am 10:26 AM

react和reactdom的区别是:ReactDom只做和浏览器或DOM相关的操作,例如“ReactDOM.findDOMNode()”操作;而react负责除浏览器和DOM以外的相关操作,ReactDom是React的一部分。

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
Repo: How To Revive Teammates
1 months agoBy尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
4 weeks agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SAP NetWeaver Server Adapter for Eclipse

SAP NetWeaver Server Adapter for Eclipse

Integrate Eclipse with SAP NetWeaver application server.

EditPlus Chinese cracked version

EditPlus Chinese cracked version

Small size, syntax highlighting, does not support code prompt function

PhpStorm Mac version

PhpStorm Mac version

The latest (2018.2.1) professional PHP integrated development tool

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use