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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