场景
采用uniapp的movable-view组件实现滑动验证组件。
- 流程
- 滑块未滑到最右端时,回弹到原点
- 滑块滑到最右端时,则显示滑动结束,不可再滑动
问题
频繁设置uniapp的movable-view组件的x属性,在H5端正常,但在微信小程序端则失效。
index.vue
<template>
<view style="height: 100vh;width: 800rpx;display: flex;justify-content: center;align-items: center;">
<wo-slider>
</wo-slider>
</view>
</template>
<script>
import woSlider from './woSlider.vue'
export default {
components: {
woSlider
},
}
</script>
<style>
</style>
woSlider.vue
<template>
<view>
<movable-area id="skidway" class="skidway">右滑全开
<movable-view :damping="100" @touchend="onEnd" id="slider" :x="x" class='slider' direction="horizontal" @change="onChange" :disabled="isFinished">
<view style="border-radius: 50%;height: 100%; width: 100%;overflow: auto;">
<view v-if="isFinished" style="height: 100%">
<view style="background: #1BA035; height: 100%; display: flex;justify-content: center;align-items: center;">
<view class='movable-icon' style="background-image: url(/static/select-bold.svg)"></view>
</view>
</view>
<view v-else style="height: 100%">
<view style="background: #E5673B;height: 100%; display: flex;justify-content: center;align-items: center;">
<view class='movable-icon' style="background-image: url(/static/arrow-right-bold.svg)"></view>
</view>
</view>
</view>
</movable-view>
</movable-area>
</view>
</template>
<script>
export default {
data() {
return {
x: 0,
oldX: 0,
skidwayWidth: 0, // 滑道长度
sliderWidth: 0, // 滑块长度
isFinished: false,
moveWidth: 0
}
},
mounted() {
const elemt = uni.createSelectorQuery().in(this)
elemt.select('#skidway').boundingClientRect((data) => {
this.skidwayWidth = data.width; // 获取滑道长度
}).exec()
elemt.select('#slider').boundingClientRect((data) => {
this.sliderWidth = data.width; // 获取滑块长度
}).exec()
},
methods: {
onChange: function(e) {
this.x = e.detail.x
if(Math.round(this.x) >= Math.round(this.skidwayWidth - this.sliderWidth)) {
this.isFinished = true // 滑到最右端则完成
}
},
onEnd: function(e) {
if(Math.round(this.x) < Math.round(this.skidwayWidth - this.sliderWidth)) {
setTimeout(()=>{
this.x = 0 // 触摸松开的时候,未滑到最右端时则回到原位
}, 100)
}
}
}
}
</script>
<style>
.skidway{
background-color: aliceblue;
width:200px;
height: 80rpx;
border-radius: 60rpx;
display:flex;
justify-content:center;
align-items:center;
position: relative;
}
.slider{
width: 80rpx;
height: 80rpx;
}
.movable-icon{
width: 30rpx;
height: 30rpx;
background-size: 100% 100%;
}
.end-status {
border-radius: 60rpx 0rpx 0rpx 60rpx;
background-color: red;
height: 100%;
overflow: auto;
position: absolute;
left: 0;
top: 0;
display: flex;
justify-content: center;
align-items: center;
color: #fff;
}
</style>
- H5端
- 微信小程序端
原因
官方给出的解释:
由于app和小程序的架构是逻辑层与视图层分离,使用js监听拖动时会引发逻辑层和视图层的频繁通讯,影响性能。为了方便高性能的实现拖动,平台特封装了movable-area组件。
意思大概就是: 对频繁变化的组件属性值做了一些优化,将"多次变化"合为"少次变化"来执行。
官方给出的解决方案:
官方推荐第一种方法去解决这个问题,所以我们就来试试第一种。
第一种方法的思路就是:先用一个变量记录频繁变化的属性值,在最后的结束动作再用这个记录值来修改组件的属性值。
结果:成功解决在小程序端失效的问题
<template>
<view>
<movable-area id="skidway" class="skidway">右滑全开
<movable-view :damping="100" @touchend="onEnd" id="slider" :x="x" class='slider' direction="horizontal" @change="onChange" :disabled="isFinished">
<view style="border-radius: 50%;height: 100%; width: 100%;overflow: auto;">
<view v-if="isFinished" style="height: 100%">
<view style="background: #1BA035; height: 100%; display: flex;justify-content: center;align-items: center;">
<view class='movable-icon' style="background-image: url(/static/select-bold.svg)"></view>
</view>
</view>
<view v-else style="height: 100%">
<view style="background: #E5673B;height: 100%; display: flex;justify-content: center;align-items: center;">
<view class='movable-icon' style="background-image: url(/static/arrow-right-bold.svg)"></view>
</view>
</view>
</view>
</movable-view>
</movable-area>
</view>
</template>
<script>
export default {
data() {
return {
x: 0,
oldX: 0,
skidwayWidth: 0, // 滑道长度
sliderWidth: 0, // 滑块长度
isFinished: false,
moveWidth: 0
}
},
mounted() {
const elemt = uni.createSelectorQuery().in(this)
elemt.select('#skidway').boundingClientRect((data) => {
this.skidwayWidth = data.width; // 获取滑道长度
}).exec()
elemt.select('#slider').boundingClientRect((data) => {
this.sliderWidth = data.width; // 获取滑块长度
}).exec()
},
methods: {
onChange: function(e) {
this.oldX = e.detail.x // 记录变化值
if(Math.round(this.oldX) >= Math.round(this.skidwayWidth - this.sliderWidth)) {
this.isFinished = true // 滑到最右端则完成
}
},
onEnd: function(e) {
this.x = this.oldX // 触摸松开,设置movable-view的x属性为记录的变化值
if(Math.round(this.oldX) < Math.round(this.skidwayWidth - this.sliderWidth)) {
setTimeout(()=>{ // 触摸松开的时候,未滑到最右端时则回到原位
this.x = 0
this.oldX = 0
}, 100)
}
}
}
}
</script>
<style>
.skidway{
background-color: aliceblue;
width:200px;
height: 80rpx;
border-radius: 60rpx;
display:flex;
justify-content:center;
align-items:center;
position: relative;
}
.slider{
width: 80rpx;
height: 80rpx;
}
.movable-icon{
width: 30rpx;
height: 30rpx;
background-size: 100% 100%;
}
.end-status {
border-radius: 60rpx 0rpx 0rpx 60rpx;
background-color: red;
height: 100%;
overflow: auto;
position: absolute;
left: 0;
top: 0;
display: flex;
justify-content: center;
align-items: center;
color: #fff;
}
</style>