微信小程序滚动Tab如何实现左右可滑动切换的实例分析

<view >
  <scroll-view scroll-x="true" class="tab-h" scroll-left="{{scrollLeft}}">
    <view class="tab-item {{currentTab==0?&#39;active&#39;:&#39;&#39;}}" data-current="0" bindtap="swichNav">健康</view>
    <view class="tab-item {{currentTab==1?&#39;active&#39;:&#39;&#39;}}" data-current="1" bindtap="swichNav">情感</view>
    <view class="tab-item {{currentTab==2?&#39;active&#39;:&#39;&#39;}}" data-current="2" bindtap="swichNav">职场</view>
    <view class="tab-item {{currentTab==3?&#39;active&#39;:&#39;&#39;}}" data-current="3" bindtap="swichNav">育儿</view>
    <view class="tab-item {{currentTab==4?&#39;active&#39;:&#39;&#39;}}" data-current="4" bindtap="swichNav">纠纷</view>
    <view class="tab-item {{currentTab==5?&#39;active&#39;:&#39;&#39;}}" data-current="5" bindtap="swichNav">青葱</view>
    <view class="tab-item {{currentTab==6?&#39;active&#39;:&#39;&#39;}}" data-current="6" bindtap="swichNav">全部</view>
    <view class="tab-item {{currentTab==7?&#39;active&#39;:&#39;&#39;}}" data-current="7" bindtap="swichNav">其他</view>
  </scroll-view>
  <swiper class="tab-content" current="{{currentTab}}" duration="300" bindchange="switchTab"
   style="height:{{winHeight}}rpx">
    <swiper-item wx:for="{{[0,1,2,3,4,5,6,7]}}">
      <scroll-view scroll-y="true" class="scoll-h" >
        <block wx:for="{{[1,2,3,4,5,6,7,8]}}" wx:key="*this">
          <view class="item-ans">
            <view class="avatar">
              <image class="img" src="http://ookzqad11.bkt.clouddn.com/avatar.png"></image>
            </view>
            <view class="expertInfo">
              <view class="name">欢颜</view>
              <view class="tag">知名情感博主</view>
              <view class="answerHistory">134个回答，2234人听过 </view>
            </view>
            <navigator url="/pages/askExpert/expertDetail" class="askBtn">问TA</navigator> 
          </view>
        </block>
      </scroll-view>
    </swiper-item>
  </swiper>
</view>

var app = getApp();
Page({
  data:{
    winHeight:"",//窗口高度
    currentTab:0, //预设当前项的值
    scrollLeft:0, //tab标题的滚动条位置
    expertList:[{ //假数据
      img:"avatar.png",
      name:"欢顔",
      tag:"知名情感博主",
      answer:134,
      listen:2234
    }]
  },
  // 滚动切换标签样式
  switchTab:function(e){
    this.setData({
      currentTab:e.detail.current
    });
    this.checkCor();
  },
  // 点击标题切换当前页时改变样式
  swichNav:function(e){
    var cur=e.target.dataset.current;
    if(this.data.currentTaB==cur){return false;}
    else{
      this.setData({
        currentTab:cur
      })
    }
  },
  //判断当前滚动超过一屏时，设置tab标题滚动条。
  checkCor:function(){
   if (this.data.currentTab>4){
    this.setData({
     scrollLeft:300
    })
   }else{
    this.setData({
     scrollLeft:0
    })
   }
  },
  onLoad: function() { 
    var that = this; 
    // 高度自适应
    wx.getSystemInfo( { 
      success: function( res ) { 
        var clientHeight=res.windowHeight,
          clientWidth=res.windowWidth,
          rpxR=750/clientWidth;
       var calc=clientHeight*rpxR-180;
        console.log(calc)
        that.setData( { 
          winHeight: calc 
        }); 
      } 
    });
  }, 
  footerTap:app.footerTap
})

.tab-h{
  height: 80rpx;width: 100%; box-sizing: border-box;overflow: hidden;line-height: 80rpx;background: #F7F7F7; font-size: 16px; white-space: nowrap;position: fixed;top: 0; left: 0; z-index: 99;}
.tab-item{margin:0 36rpx;display: inline-block;}
.tab-item.active{color: #4675F9;position: relative;}
.tab-item.active:after{ content: "";display: block;height: 8rpx;width: 52rpx;background: #4675F9;position: absolute; bottom: 0;left: 5rpx;border-radius: 16rpx;}
.item-ans{ width: 100%;display: flex; flex-grow: row no-wrap;justify-content: space-between; padding: 30rpx;box-sizing: border-box; height: 180rpx;align-items: center;border-bottom: 1px solid #F2F2F2;}
.avatar{width: 100rpx;height: 100rpx;position: relative;padding-right: 30rpx;}
.avatar .img{width: 100%;height: 100%;}
.avatar .doyen{width: 40rpx;height: 40rpx;position: absolute;bottom: -2px;right: 20rpx;}
.expertInfo{font-size: 12px;flex-grow: 2;color: #B0B0B0;line-height: 1.5em;}
.expertInfo .name{font-size: 16px;color:#000;margin-bottom: 6px;}
.askBtn{ width: 120rpx;height: 60rpx;line-height: 60rpx;text-align: center;font-size: 14px; border-radius: 60rpx;border: 1px solid #4675F9; color:#4675F9;}
.tab-content{margin-top: 80rpx;}
.scoll-h{height: 100%;}