React 移动端判断用户划屏方向
功能展示:
1.当用户触发划屏事件时
2.判断其正确方向并alert出来
3.总共上下左右四种
所有代码:
import React,{Component} from 'react';import './Stroke.css'
class Stroke extends Component{
constructor(props){
super(props);
this.state={
firstX:0,
firstY : 0,
endX :0,
endY :0,
moveX :0,
moveY:0,
}
}
NavonTouchStart=(e)=>{
this.setState({
firstX :e.targetTouches[0].clientX,
firstY :e.targetTouches[0].clientY,
})
}
NavonTouchMove =(e)=> {
this.setState({
endX: e.changedTouches[0].clientX,
endY: e.changedTouches[0].clientY,
});
var moveX = this.state.endX - this.state.firstX;
var moveY = this.state.endY - this.state.firstY;
if(Math.abs(moveX) > 100 || Math.abs(moveY) > 100){
if(Math.abs(moveX) > Math.abs(moveY)){
var ele = moveX > 0 ? "向右" : "向左";
alert(ele);
}else{
var ele = moveY > 0 ? "向下" : "向上";
alert(ele);
}
}
}
render(){
return(
<div className="Stroke"
onTouchStart={this.NavonTouchStart.bind(this)}
onTouchMove={this.NavonTouchMove.bind(this)}
>
</div>
)
}
}
export default Stroke
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