微信小程序滚动Tab如何实现左右可滑动切换的实例分析

微信小程序滚动Tab实现左右可滑动切换

效果：

1、tab标题总共8个，所以一屏无法全部显示。 2、tab内容区左右滑动切换时，tab标题随即做标记（active）。 3、当active的标题不在当前屏显示时，要使其能显示到当前屏中。

一、wxml结构

说明：

1、设置data-current属性用于：点击当前项时，通过点击事件swichNav中处理e.dataset.current取到点击的目标值。 2、swiper组件的current组件用于控制当前显示哪一页 3、swiper组件绑定change事件switchTab，通过e.detail.current拿到当前页

<view >    <scroll-view scroll-x="true" class="tab-h" scroll-left="{{scrollLeft}}">      <view class="tab-item {{currentTab==0?'active':''}}" data-current="0" bindtap="swichNav">健康</view>      <view class="tab-item {{currentTab==1?'active':''}}" data-current="1" bindtap="swichNav">情感</view>      <view class="tab-item {{currentTab==2?'active':''}}" data-current="2" bindtap="swichNav">职场</view>      <view class="tab-item {{currentTab==3?'active':''}}" data-current="3" bindtap="swichNav">育儿</view>      <view class="tab-item {{currentTab==4?'active':''}}" data-current="4" bindtap="swichNav">纠纷</view>      <view class="tab-item {{currentTab==5?'active':''}}" data-current="5" bindtap="swichNav">青葱</view>      <view class="tab-item {{currentTab==6?'active':''}}" data-current="6" bindtap="swichNav">全部</view>      <view class="tab-item {{currentTab==7?'active':''}}" 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>

二、js部分

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  })

三、wxss样式

.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%;}

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