微信小程序tab切换可滑动切换导航栏跟随滚动实现代码

 
 
 
 
  
   {{navItem.text}}
    
 
 
   
  
   {{tabItem}}
  
 

/**index.wxss**/
page{
 width: 100%;
 height: 100%;
}
.container{
 width: 100%;
 height: 100%;
}
.nav {
 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;
}
.nav-item {
 width: 20%;
 display: inline-block;
 text-align: center;
}
.nav-item.active{
 color: red;
}
.tab-box{
 background: greenyellow;
 padding-top: 80rpx;
 height: 100%;
 box-sizing: border-box;
}
.tab-content{
 overflow-y: scroll;
}

//index.js
//获取应用实例
const app = getApp()

Page({
 data: {
  motto: 'Hello World',
  userInfo: {},
  hasUserInfo: false,
  canIUse: wx.canIUse('button.open-type.getUserInfo'),
  navData:[
   {
    text: '首页'
   },
   {
    text: '健康'
   },
   {
    text: '情感'
   },
   {
    text: '职场'
   },
   {
    text: '育儿'
   },
   {
    text: '纠纷'
   },
   {
    text: '青葱'
   },
   {
    text: '上课'
   },
   {
    text: '下课'
   }
  ],
  currentTab: 0,
  navScrollLeft: 0
 },
 //事件处理函数
 onLoad: function () {
  if (app.globalData.userInfo) {
   this.setData({
    userInfo: app.globalData.userInfo,
    hasUserInfo: true
   })
  } else if (this.data.canIUse) {
   // 由于 getUserInfo 是网络请求，可能会在 Page.onLoad 之后才返回
   // 所以此处加入 callback 以防止这种情况
   app.userInfoReadyCallback = res => {
    this.setData({
     userInfo: res.userInfo,
     hasUserInfo: true
    })
   }
  } else {
   // 在没有 open-type=getUserInfo 版本的兼容处理
   wx.getUserInfo({
    success: res => {
     app.globalData.userInfo = res.userInfo
     this.setData({
      userInfo: res.userInfo,
      hasUserInfo: true
     })
    }
   })
  }


  wx.getSystemInfo({
   success: (res) => {
    this.setData({
     pixelRatio: res.pixelRatio,
     windowHeight: res.windowHeight,
     windowWidth: res.windowWidth
    })
   },
  })  
 },
 switchNav(event){
  var cur = event.currentTarget.dataset.current; 
  //每个tab选项宽度占1/5
  var singleNavWidth = this.data.windowWidth / 5;
  //tab选项居中       
  this.setData({
   navScrollLeft: (cur - 2) * singleNavWidth
  })  
  if (this.data.currentTab == cur) {
   return false;
  } else {
   this.setData({
    currentTab: cur
   })
  }
 },
 switchTab(event){
  var cur = event.detail.current;
  var singleNavWidth = this.data.windowWidth / 5;
  this.setData({
   currentTab: cur,
   navScrollLeft: (cur - 2) * singleNavWidth
  });
 }
})