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
其实说了这么多，就是个最普通的验证码的功能。。。
效果
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
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}
</View>
)}
}
应用代码
