效果图：
功能描述，小程序列表左滑删除功能的实现完整源代码实现：
<view wx:for='{{friends}}' wx:key="" wx:if='{{groupType==4}}' catchtap="nav_oneChat" id="{{item._id}}" class="item p_r" style="{{item.txtStyle}}" bindtouchstart="touchS" bindtouchmove="touchM" bindtouchend="touchE" data-index="{{index}}">
<image class="head" src="{{item.identity=='a'?(item.b_head||'/image/default_head.png'):(item.a_head||'/image/default_head.png')}}"></image>
<view wx:if='{{item.hongdian}}' class="hongdian"></view>
<view class="loc" wx:if='{{!item.delShow}}'>{{item.newTime}}</view>
<view class="userName">{{item.identity=='a'?item.b_name:item.a_name}}</view>
<!-- 左滑删除 -->
<view bindtap="delItem" wx:if='{{item.delShow}}' class="posit">
<view class="del" data-id="{{item._id}}" data-index="{{index}}" catchtap="del">删除</view>
</view>
</view>
JS代码：
//手指刚放到屏幕触发
touchS:function(e){
console.log("touchS"+e);
//判断是否只有一个触摸点
if(e.touches.length==1){
this.setData({
//记录触摸起始位置的X坐标
startX:e.touches[0].clientX
});
}
},
//触摸时触发，手指在屏幕上每移动一次，触发一次
touchM:function(e){
console.log("touchM:"+e);
var that = this
if(e.touches.length==1){
//记录触摸点位置的X坐标
var moveX = e.touches[0].clientX;
//计算手指起始点的X坐标与当前触摸点的X坐标的差值
var disX = that.data.startX - moveX;
//delBtnWidth 为右侧按钮区域的宽度
var delBtnWidth = that.data.delBtnWidth;
var txtStyle = "";
if(disX == 0 || disX < 0){//如果移动距离小于等于0，文本层位置不变
txtStyle = "left:0px";
}else if(disX > 0 ){//移动距离大于0，文本层left值等于手指移动距离
txtStyle = "left:-"+disX+"px";
if(disX>=delBtnWidth){
//控制手指移动距离最大值为删除按钮的宽度
txtStyle = "left:-"+delBtnWidth+"px";
}
}
//获取手指触摸的是哪一个item
var index = e.currentTarget.dataset.index;
var list = that.data.friends;
//将拼接好的样式设置到当前item中
list[index].txtStyle = txtStyle;
list.forEach(item=>item.delShow=false)
list[index].delShow = true;
//更新列表的状态
this.setData({
friends:list
});
}
},
touchE:function(e){
console.log("touchE"+e);
var that = this
if(e.changedTouches.length==1){
//手指移动结束后触摸点位置的X坐标
var endX = e.changedTouches[0].clientX;
//触摸开始与结束，手指移动的距离
var disX = that.data.startX - endX;
var delBtnWidth = that.data.delBtnWidth;
//如果距离小于删除按钮的1/2，不显示删除按钮
var txtStyle = disX > delBtnWidth/2 ? "left:-"+delBtnWidth+"px":"left:0px";
//获取手指触摸的是哪一项
var index = e.currentTarget.dataset.index;
var list = that.data.friends;
list[index].txtStyle = txtStyle;
//更新列表的状态
that.setData({
friends:list
});
}
},
css （样式部分可用自己的，这里仅供参考）
/* pages/chatList/chatList.wxss */
page {
background-color: #EDEDED;
}
.posit{
padding: 50rpx 10rpx 50rpx;
background-color: white;
}
.del{
width: 200rpx;
height: 60rpx;
line-height: 60rpx;
text-align: center;
background-color: red;
z-index: 2;
color: white;
}
.groupType{
text-align: center;
flex: 1;
z-index: 999999;
}
.ring1{
position: fixed;
top: 30rpx;
right: 30rpx;
height: 40rpx;
width: 40rpx;
z-index:99999;
background-color: white;
padding:10rpx;
border-radius: 50%;
border: 1px solid #d0d0d0;
}
.ring2{
position: fixed;
top: 130rpx;
right: 30rpx;
height: 40rpx;
width: 40rpx;
z-index:99999;
background-color: white;
padding:10rpx;
border-radius: 50%;
border: 1px solid #d0d0d0;
}
.on{
color: cadetblue;
}
.hongdian{
width: 20rpx;
height: 20rpx;
border-radius: 50%;
background-color: red;
position: absolute;
left: 96rpx;
top: 14rpx;
}
.addIcon{
width: 80rpx;
height: 80rpx;
position: fixed;
right: 50rpx;
bottom: 300rpx;
border-radius: 50%;
}
.p_r{
display: flex;
flex-direction: row;
}
.tab{
position: fixed;
bottom: 0;
border-top: 1px solid #d0d0d0;
height: 90rpx;
line-height: 90rpx;
z-index: 999999;
background-color: white;
width: 100%;
}
.top{
position: fixed;
top: 0;
z-index: 2;
width: 100%;
background-color: #EDEDED;
}
.pageTitle {
padding-top: 60rpx;
padding-left: 20rpx;
height: 140rpx;
background-color: #EDEDED;
}
.searchcion {
margin: 16rpx 10rpx 10rpx 10rpx;
position: absolute;
right: 15rpx;
z-index: 2;
width: 20px;
height: 20px;
text-align: center;
}
.search_arr {
border: 1px solid #d0d0d0;
background-color: #EDEDED;
border-radius: 50rpx;
margin-left: 30rpx;
position: fixed;
width: 40%;
top: 54rpx;
left: 200rpx;
}
.search_arr input {
margin-left: 20rpx;
height: 60rpx;
border-radius: 5px;
}
swiper{
position: fixed;
width: 100%;
}
.swiper-item{
width: 100%;
height: 300rpx;
}
.item{
position: relative;
margin-bottom: 20rpx;
}
.head{
width: 90rpx;
height: 90rpx;
min-width: 90rpx;
border-radius: 10rpx;
margin: 16rpx;
}
.user_list{
position: relative;
padding: 20rpx 0 20rpx;
background-color: white;
margin-bottom: 100rpx;
}
.userName{
margin-left: 20rpx;
border-bottom: 1rpx solid #d0d0d0;
width: 82%;
font-weight: normal;
font-size: 32rpx;
margin-top: 32rpx;
padding-bottom: 10rpx;
}
.loc{
position: absolute;
right: 40rpx;
top: 40rpx;
}
