vue实现滑动切换效果（仅在手机模式下可用）

时间:2020-05-17 tjzc1352640 人气:0

本文实例为大家分享了vue实现滑动时红黄色块左右滑动相应距离，效果如下图

实现过程主要在于实时跟踪手指滑动位置与原位置之间的偏移量，再相应移动红黄块。

红黄块布局如下

back中包含back-l,back-r左右两块，正常情况下为了隐藏其中一块，子模块需要设置display: inline-block，并且宽度都需要设置width: 100%。父模块中设置white-space: nowrap用于处理两个子模块之间的空白。

<template lang="html">
 <div class="back"
 @touchstart.prevent="touchStart"
 @touchmove.prevent="touchMove"
 @touchend="touchEnd" ref="back">
  <div class="back-l" ref="left"></div>
  <div class="back-r" ref="right"></div>
 </div>
</template>
 
<style scoped lang="stylus" rel="stylesheet/stylus">
.back
 position: fixed
 width: 100%
 height: 100px
 white-space: nowrap
 .back-l
  position: relative
  vertical-align: top
  display: inline-block
  width: 100%
  height: 100%
  background-color: red
 .back-r
  display: inline-block
  vertical-align: top
  position: relative
  width: 100%
  height: 100%
  background-color: yellow
</style>

父模块监听滑动事件

滑动事件分为三种：touchstart，touchmove，touchEnd，加上prevent避免页面相应滑动。

在touchstart中记录滑动开始点：

touchStart(e) {
   const touch = e.touches[0]
   this.touch.startX = touch.pageX
   this.touch.startY = touch.pageY
  }

touchmove中为滑动过程，手指未离开页面，离开页面时触发touchend。滑动过程中，当横向偏离位置大于纵向偏离位置时认为滑动有效，记录手指偏离位置，相应移动红黄块。

touchMove(e) {
   console.log("move");
   const touch = e.touches[0]
   //横向和纵向偏离位置
   const deltaX = touch.pageX - this.touch.startX
   const deltaY = touch.pageY - this.touch.startY
   if (Math.abs(deltaY) > Math.abs(deltaX)) {
    return
   }
   const left = this.currentPlay == 'red' ? 0 : -window.innerWidth
   var offsetWidth = Math.min(0, Math.max(-window.innerWidth,left+deltaX))
   //记录滑动的距离占屏幕宽度的百分比，如果滑动太少则不切换
   this.percent = Math.abs(offsetWidth/window.innerWidth)
   //移动红黄块   
   this.$refs.back.style["transform"] = `translate3d(${offsetWidth}px,0,0)`
   //设置动画时间   
   this.$refs.back.style["transitionDuration"] = 10
  }

计算偏移量时首先需要知道当前偏移位置，如果当前在红块，初始偏移量为0，否则初始偏移量为负的屏幕宽度。初始偏移量加上横向偏移量首先和-window.innerWidth取最大值，-window.innerWidth为最左偏移量。再和0相比较取最小值，偏移量为0或者大于零则不再（向右移动）移动，小于零则可以向左移动。

touchend中处理最终效果，如果滑动距离不大于某一值则恢复原位，否则切换。

touchEnd() {
 console.log("end");
 console.log(this.percent);
 let offsetWidth
 let percent
 //当前为红色，滑动占比大于0.1则切换，否则回到原位置
 if(this.currentPlay === 'red'){
  if(this.percent > 0.1) {
   this.currentPlay = 'yellow'
   offsetWidth = -window.innerWidth
  } else {
   offsetWidth = 0
  }
 } else {
 //当前为黄色，滑动占比大于0.9则切换，否则回到原位置
  if(this.percent < 0.9) {
   this.currentPlay = 'red'
   offsetWidth = 0
  } else {
   offsetWidth = -window.innerWidth
  }
 }
 //这里的transform是针对最开始的位置而言，而不是移动过程中的位置
 this.$refs.back.style["transform"] = `translate3d(${offsetWidth}px,0,0)`
 this.$refs.back.style["transitionDuration"] = 10
}

完整代码

<template lang="html">
 <div class="back"
 @touchstart.prevent="touchStart" @touchmove.prevent="touchMove"
 @touchend="touchEnd" ref="back">
  <div class="back-l" ref="left"></div>
  <div class="back-r" ref="right"></div>
 
 </div>
</template>
 
<script>
export default {
 data() {
  return {
   currentPlay: 'red',
   percent: 0
  }
 },
 created() {
  this.touch = {}
 },
 methods: {
  touchStart(e) {
   const touch = e.touches[0]
   this.touch.startX = touch.pageX
   this.touch.startY = touch.pageY
  },
  touchMove(e) {
   console.log("move");
   const touch = e.touches[0]
   const deltaX = touch.pageX - this.touch.startX
   const deltaY = touch.pageY - this.touch.startY
   if (Math.abs(deltaY) > Math.abs(deltaX)) {
    return
   }
   const left = this.currentPlay == 'red' ? 0 : -window.innerWidth
   var offsetWidth = Math.min(0, Math.max(-window.innerWidth,left+deltaX))
   this.percent = Math.abs(offsetWidth/window.innerWidth)
   this.$refs.back.style["transform"] = `translate3d(${offsetWidth}px,0,0)`
   this.$refs.back.style["transitionDuration"] = 10
 
 
 
  },
  touchEnd() {
   console.log("end");
   console.log(this.percent);
   let offsetWidth
   let percent
   if(this.currentPlay === 'red'){
    if(this.percent > 0.1) {
     this.currentPlay = 'yellow'
     offsetWidth = -window.innerWidth
    } else {
     offsetWidth = 0
    }
   } else {
    if(this.percent < 0.9) {
     this.currentPlay = 'red'
     offsetWidth = 0
    } else {
     offsetWidth = -window.innerWidth
    }
   }
   this.$refs.back.style["transform"] = `translate3d(${offsetWidth}px,0,0)`
   this.$refs.back.style["transitionDuration"] = 10
  }
 }
}
</script>
 
<style scoped lang="stylus" rel="stylesheet/stylus">
.back
 position: fixed
 width: 100%
 height: 100px
 white-space: nowrap
 .back-l
  position: relative
  vertical-align: top
  display: inline-block
  width: 100%
  height: 100%
  background-color: red
 .back-r
  display: inline-block
  vertical-align: top
  position: relative
  width: 100%
  height: 100%
  background-color: yellow
 
 
</style>

加载全部内容