微信小程序仿抖音视频之整屏上下切换功能的实现代码

效果演示：

WXML：

<view class="video_box">
 <view bindtouchend="touchEnd" id="myVideo{{index}}" animation="{{animation}}" bindtouchstart="touchStart" bindtouchmove="touchMove" class="video_list" wx:for="{{video_list}}" data-index="{{index}}" wx:key="index" >
  <text style="color:red;font-size:30px;display:block;">{{index}}</text>
  <video custom-cache="{{false}}" src="{{item.video_src}}" vslide-gesture-in-fullscreen="{{false}}" direction = '{{0}}' enable-progress-gesture="{{false}}" show-fullscreen-btn="{{false}}" object-fit="cover"></video>
 </view>
</view>

WXSS：

.video_box{width: 100%;height: auto;position: fixed;top:0;bottom: 0;background-color: #000;}
.video_list{width: 100%;height: 100vh;position: relative;}
.video_list video{position: absolute;top:50%;margin-top:-30vw; width: 100%;height:56vw;padding: 0;}

Page({
 /**
  * 页面的初始数据
  */
 data: {
  video_list:[
   {video_src:'https://stream7.iqilu.com/10339/upload_transcode/202002/18/20200218093206z8V1JuPlpe.mp4'},
   {video_src:'https://stream7.iqilu.com/10339/article/202002/17/c292033ef110de9f42d7d539fe0423cf.mp4'},
   {video_src:'https://stream7.iqilu.com/10339/upload_transcode/202002/18/20200218025702PSiVKDB5ap.mp4'},
   {video_src:'https://stream7.iqilu.com/10339/article/202002/18/2fca1c77730e54c7b500573c2437003f.mp4'},
   {video_src:'https://stream7.iqilu.com/10339/upload_transcode/202002/18/20200218093206z8V1JuPlpe.mp4'},
   {video_src:'https://stream7.iqilu.com/10339/upload_transcode/202002/18/20200218114723HDu3hhxqIT.mp4'},
   {video_src:'https://stream7.iqilu.com/10339/upload_transcode/202002/18/20200218025702PSiVKDB5ap.mp4'},
   {video_src:'https://stream7.iqilu.com/10339/article/202002/17/c292033ef110de9f42d7d539fe0423cf.mp4'},
   {video_src:'https://stream7.iqilu.com/10339/upload_transcode/202002/18/20200218093206z8V1JuPlpe.mp4'},
   {video_src:'https://stream7.iqilu.com/10339/upload_transcode/202002/18/20200218114723HDu3hhxqIT.mp4'},
  ],
  pageY:'',    // 触摸起始高度坐标
  animation:'',  // 视频划动动画
  up_stroke:false,// ture:上划；false：下划
  difference:'', // 拖动的距离
  windowHeight:'',// 屏幕高度
 },
 /**
  * 生命周期函数--监听页面加载
  */
 onLoad: function (options) {
  // 赋值：屏幕高度、
  this.setData({
   windowHeight:wx.getSystemInfoSync().windowHeight
  })
 },
 // 划动起始坐标方法
 touchStart(e){
  // 开始坐标
  this.setData({
   pageY:e.touches[0].pageY,
  })
 },
 // 划动过程坐标方法
 touchMove(e){
  let n = e.currentTarget.dataset.index;   // 触摸的第几个序号
  let difference = e.touches[0].pageY - this.data.pageY; // 移动后和起始值的差值
  if(this.is_continue(n,difference)){    // 判断是否到底
   return;
  }
  // 划动动画 -------------------------------------
  var animation = wx.createAnimation({    // 移动动效
   duration: 0,
  });
  animation.top(difference - (n*this.data.windowHeight)).step()
  this.setData({
   animation: animation.export(),     // 动画
   up_stroke:difference > 0 ? false : true, // 是否上划,
   difference:difference,          // 拖动的距离
  })
 },
 // 划动结束坐标方法
 touchEnd(e){
  let n = e.currentTarget.dataset.index;
  let difference = this.data.difference; // 拖动的距离
  if(this.is_continue(n,difference)){
   return;
  }
  const windowHeight = this.data.windowHeight;   // 屏幕高度
  let that = this;
  // 根据id获取点击元素距顶部高度
  var query = wx.createSelectorQuery();
  let id = '#' + e.currentTarget.id;
  query.select(id).boundingClientRect(function (rect) { // 获取高度
   if(Math.abs(difference) <= windowHeight /7){   // 小于1/7回原位置 ---------------------------
    var animation = wx.createAnimation({ // 移动动效
     duration: 100,
    });
    animation.top(-(n * windowHeight)).step()
    that.setData({
     animation: animation.export(),
     up_stroke:false, // 重置划动状态
     difference:0,   // 重置划动距离
    })
   }else{ // 大于1/4，移至拖动的下一个视频 --------------------------------
    var animation = wx.createAnimation({ // 移动动效
     duration: 200,
    });
    that.data.up_stroke ? n++ : n--;   // 上划：n+1 下划：n-1
    animation.top(-(n * windowHeight)).step()
    that.setData({
     animation: animation.export(),
     up_stroke:false, // 重置划动状态
     difference:0,   // 重置划动距离
    })
   }
  }).exec();
 },
 // 判断是否到底
 is_continue(n,difference){
  if(difference < 0){ // 上划
   if(n == this.data.video_list.length - 1){ // 最后一个视频，提示到底
    if(difference < -20){
     wx.showToast({
      title: '已经到底了~~',
      icon:'none',
      duration:1000
     })
    }
    return true;
   }
  }else{
   if(n == 0){
    if(difference > 20){
     wx.showToast({
      title: '上面没有了~~',
      icon:'none',
      duration:1000
     })
    }
    return true;
   }
  }
 },
})

总结

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