vue实现滑动切换效果(仅在手机模式下可用)

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>

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