微信小程序 向左滑动删除功能的实现

微信小程序 向左滑动删除功能的实现

实现效果图：

实现代码：

1、wxml touch-item元素绑定了bindtouchstart、bindtouchmove事件

<view class="container">
 <view class="touch-item {{item.isTouchMove ? 'touch-move-active' : ''}}" data-index="{{index}}" bindtouchstart="touchstart" bindtouchmove="touchmove" wx:for="{{items}}" wx:key="">
 <view class="content">{{item.content}}</view>
 <view class="del" catchtap="del" data-index="{{index}}">删除</view>
 </view>
</view>

2、wxss flex布局、css3动画

.touch-item {
 font-size: 14px;
 display: flex;
 justify-content: space-between;
 border-bottom:1px solid #ccc;
 width: 100%;
 overflow: hidden
}
.content {
 width: 100%;
 padding: 10px;
 line-height: 22px;
 margin-right:0;
 -webkit-transition: all 0.4s;
 transition: all 0.4s;
 -webkit-transform: translateX(90px);
 transform: translateX(90px);
 margin-left: -90px
}
.del {
 background-color: orangered;
 width: 90px;
 display: flex;
 flex-direction: column;
 align-items: center;
 justify-content: center;
 color: #fff;
 -webkit-transform: translateX(90px);
 transform: translateX(90px);
 -webkit-transition: all 0.4s;
 transition: all 0.4s;
}
.touch-move-active .content,
.touch-move-active .del {
 -webkit-transform: translateX(0);
 transform: translateX(0);
}

3、js 注释很详细

var app = getApp()
Page({
 data: {
 items: [],
 startX: 0, //开始坐标
 startY: 0
 },
 onLoad: function () {
 for (var i = 0; i < 10; i++) {
 this.data.items.push({
 content: i + " 向左滑动删除哦,向左滑动删除哦,向左滑动删除哦,向左滑动删除哦,向左滑动删除哦",
 isTouchMove: false //默认全隐藏删除
 })
 }
 this.setData({
 items: this.data.items
 })
 },
 //手指触摸动作开始 记录起点X坐标
 touchstart: function (e) {
 //开始触摸时 重置所有删除
 this.data.items.forEach(function (v, i) {
 if (v.isTouchMove)//只操作为true的
 v.isTouchMove = false;
 })
 this.setData({
 startX: e.changedTouches[0].clientX,
 startY: e.changedTouches[0].clientY,
 items: this.data.items
 })
 },
 //滑动事件处理
 touchmove: function (e) {
 var that = this,
 index = e.currentTarget.dataset.index,//当前索引
 startX = that.data.startX,//开始X坐标
 startY = that.data.startY,//开始Y坐标
 touchMoveX = e.changedTouches[0].clientX,//滑动变化坐标
 touchMoveY = e.changedTouches[0].clientY,//滑动变化坐标
 //获取滑动角度
 angle = that.angle({ X: startX, Y: startY }, { X: touchMoveX, Y: touchMoveY });
 that.data.items.forEach(function (v, i) {
 v.isTouchMove = false
 //滑动超过30度角 return
 if (Math.abs(angle) > 30) return;
 if (i == index) {
 if (touchMoveX > startX) //右滑
 v.isTouchMove = false
 else //左滑
 v.isTouchMove = true
 }
 })
 //更新数据
 that.setData({
 items: that.data.items
 })
 },
 /**
 * 计算滑动角度
 * @param {Object} start 起点坐标
 * @param {Object} end 终点坐标
 */
 angle: function (start, end) {
 var _X = end.X - start.X,
 _Y = end.Y - start.Y
 //返回角度 /Math.atan()返回数字的反正切值
 return 360 * Math.atan(_Y / _X) / (2 * Math.PI);
 },
 //删除事件
 del: function (e) {
 this.data.items.splice(e.currentTarget.dataset.index, 1)
 this.setData({
 items: this.data.items
 })
 }
})

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