ReactNative短信验证码倒计时控件的实现代码

由于最近刚开始认真的搞RN,可能有一些封装的不是最佳实践,还是希望大家多提意见,和大家一起进步吧。本文介绍了ReactNative短信验证码倒计时控件,分享给大家

功能

根据项目的需要,需要写一个自定义的控件,实现如下功能:

默认文字为点击获取验证码

点击后出现60秒的倒计时

颜色,字号可调

倒计时过程中,再次点击需要忽略掉

倒计时完成后文本恢复成点击获取验证码

再几次点击同之前

其实说了这么多,就是个最普通的验证码的功能。。。

效果

效果图如下:(录的图片比较一般,对付着看吧)

ReactNative短信验证码倒计时控件的实现代码

实现原理

自己封装了个控件,它内部含有一个Text控件,然后我们又写了一个timer,然后负责倒计时,然后每次都需要判断一下是否继续,然后加了一个flag字段,判断是否接受下次点击事件,当倒计时结束之后还需要将初始状态重置回去即可。

代码

控件代码

import React, {Component } from 'react'; import { StyleSheet, Text, View, Image, TextInput, TouchableHighlight, StatusBar, Alert, AppRegistry } from 'react-native'; import LinkRow from '../components/LinkRow'; import cStyles from '../styles/CommonStyle'; import axios from 'axios'; class MyCountTime extends Component { constructor(props) { super(props); let timeLeft = this.props.timeLeft > 0 ? this.props.timeLeft : 5; let width = this.props.width || 100; let height = this.props.height || 50; let color = this.props.color || '#42A5F5'; let fontSize = this.props.fontSize || 30; let fontWeight = this.props.fontWeight || '600'; let borderColor = this.props.borderColor || '#42A5F5'; let borderWidth = this.props.borderWidth || 1; let borderRadius = this.props.borderRadius || 4; let backgroundColor = this.props.backgroundColor || '#42A5F5'; let begin = 0; let press = this.props.press; this.afterEnd = this.props.afterEnd || this._afterEnd; this.style = this.props.style; this.state = { timeLeft: timeLeft, begin: begin }; this.countTextStyle = { textAlign: 'center', color: '#42A5F5', fontSize: fontSize, fontWeight: fontWeight }; this.countViewStyle = { backgroundColor: backgroundColor, alignItems: 'center', borderColor: borderColor, borderWidth: borderWidth, borderRadius: borderRadius, width: width, height: height } } countdownfn(timeLeft, callback, begin) { if (timeLeft > 0) { this.state.begin = 1; console.log("===lin===>"); let that = this; let interval = setInterval(function () { if (that.state.timeLeft < 1) { clearInterval(interval); callback(that) } else { let totalTime = that.state.timeLeft; that.setState({ timeLeft: totalTime - 1 }) } }, 1000) } } _beginCountDown() { if (this.state.begin === 1){ return; } let time = this.state.timeLeft; console.log("===lin===> time " + time); let afterEnd = this.afterEnd; let begin = this.state.begin; console.log("===lin===> start " + begin); this.countdownfn(time, afterEnd, begin) } _afterEnd(that) { console.log('------------time over'); that.setState({ begin : 0, timeLeft : 5, }) } componentDidMount() { } render() { return ( <View style={{position:'absolute',top:13,right:43,height:30}}> <Text onPress={this._beginCountDown.bind(this)} style={{color: '#42A5F5', fontSize: 17,height:40 , zIndex:999}}> { this.state.begin === 0 ? '点击获取验证码' : this.state.timeLeft} </Text> </View> ) } }

应用代码

<MyCountTime timeLeft={5}> </MyCountTime>

当然这只是,最简单的应用的代码,我们还提供了很多的自定义的属性,大家可以根据自己项目的需要,去调节这些参数。

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