ReactNative短信验证码倒计时控件
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)
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。
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。
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