微信小程序滑动切换导航-导航栏跟随滚动导航-顶部tab导航

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很多 App 都有这种设计，例如淘宝、爱奇艺、今日头条、知乎等都有用到，大部分的 App 都会用到这种设计，十分支流。

tab 导航栏应用 <scroll-view> 标签，内容应用 <swiper>，不多说，间接上代码，为了更实在展现实例的应用，我间接就配置了服务器来取数据进行渲染。

<view class="container">
    <!-- tab 导航栏 -->
    <!-- scroll-left 属性能够管制滚动条地位 -->
    <!-- scroll-with-animation 滚动增加动画过渡 -->
    <scroll-view scroll-x="true" class="nav" scroll-left="{{navScrollLeft}}" scroll-with-animation="{{true}}">
        <block wx:for="{{navData}}" wx:for-index="idx" wx:for-item="navItem" wx:key="idx">
            <view class="nav-item {{currentTab == idx ?'active':''}}"data-current="{{idx}}"bindtap="switchNav">{{navItem.text}}</view>
        </block>        
    </scroll-view>
    <!-- 页面内容 -->
    <swiper class="tab-box" current="{{currentTab}}" duration="300" bindchange="switchTab">        
        <swiper-item wx:for="{{yxlist}}" wx:for-item="tabItem" wx:for-index="idx" wx:key="idx" class="tab-content">
            <view>{{tabItem.yxname}}</view>
            <image src="{{tabItem.yxlogo}}" style="width:100px;height:100px;"></image>
        </swiper-item>
    </swiper>
</view>

/**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;
  font-weight: bold;
}
.tab-box{
  background: #fff;
  padding-top: 80rpx;
  height: 100%;
  box-sizing: border-box;
}
.tab-content{overflow-y: scroll;}

//index.js
// 获取利用实例
const app = getApp()

Page({
    data: {
        motto: 'Hello World',
        userInfo: {},
        hasUserInfo: false,
        canIUse: wx.canIUse('button.open-type.getUserInfo'),
        navData:[
            {text: '广科'},
            {text: '广东理工'},
            {text: '广石油'},
            {text: '广东工商'},
            {text: '广州科技'},
            {text: '白云'},
            {text: '肇庆'},
            {text: '嘉应'},
            {text: '华商'}
        ],
        currentTab: 0,
        navScrollLeft: 0
    },
    // 事件处理函数
    onLoad: function () {
      var that = this;
      // 向后端服务器发动申请数据
      wx.request({
        //URL
        url: 'https://www.likeyun.cn/api/yxlist.json',
        // 发送的数据
        data: {},
        // 申请的数据时 JSON 格局
        header: {'Content-Type':'application/json'},
        // 申请胜利
        success: function (res) {
          // 控制台打印（开发调试用）console.log(res.data)
          // 把所有后果存进一个名为 yxlist 的数组
          that.setData({yxlist: res.data.yuanxiaolist,})
        }
      })
      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
        });
    }
})

OK 了，是不是很简略！

为了不便大家本人写后端，我把 Json 数据格式贴出来，本人写后端的时候须要输入这样的格局才能够被我下面的代码所渲染。

{
    "yuanxiaolist":[
        {
            "id":"1",
            "yxname":"广东科技学院",
            "yxsx":"民办",
            "city":"东莞",
            "yxlogo":"http://pic.iask.cn/fimg/327765034238.jpg",
            "zynum":"25"
        },
        {
            "id":"2",
            "yxname":"广东理工学院",
            "yxsx":"民办",
            "city":"肇庆",
            "yxlogo":"http://pic.iask.cn/fimg/240805034233.jpg",
            "zynum":"27"
        },
        {
            "id":"3",
            "yxname":"广东石油化工学院",
            "yxsx":"公办",
            "city":"茂名",
            "yxlogo":"http://pic.iask.cn/fimg/9335034245.jpg",
            "zynum":"32"
        },
        {
            "id":"4",
            "yxname":"广东工商职业技术大学",
            "yxsx":"民办",
            "city":"肇庆",
            "yxlogo":"http://pic.iask.cn/fimg/709495034235.jpg",
            "zynum":"13"
        },
        {
            "id":"5",
            "yxname":"广州科技职业技术大学",
            "yxsx":"民办",
            "city":"广州",
            "yxlogo":"http://pic.iask.cn/fimg/335015034247.jpg",
            "zynum":"10"
        },
        {
            "id":"6",
            "yxname":"广东白云学院",
            "yxsx":"民办",
            "city":"广州",
            "yxlogo":"http://pic.iask.cn/fimg/80225034222.jpg",
            "zynum":"26"
        },
        {
            "id":"7",
            "yxname":"肇庆学院",
            "yxsx":"公办",
            "city":"肇庆",
            "yxlogo":"http://pic.iask.cn/fimg/489565034270.jpg",
            "zynum":"24"
        },
        {
            "id":"8",
            "yxname":"嘉应学院",
            "yxsx":"公办",
            "city":"梅州",
            "yxlogo":"http://pic.iask.cn/fimg/297705034258.jpg",
            "zynum":"41"
        },
        {
            "id":"9",
            "yxname":"广东财经大学华商学院",
            "yxsx":"民办",
            "city":"广州",
            "yxlogo":"http://pic.iask.cn/fimg/700785034254.jpg",
            "zynum":"22"
        },
        {
            "id":"10",
            "yxname":"韶关学院",
            "yxsx":"公办",
            "city":"韶关",
            "yxlogo":"http://pic.iask.cn/fimg/847955034266.jpg",
            "zynum":"41"
        },
        {
            "id":"11",
            "yxname":"广东工业大学华立学院",
            "yxsx":"民办",
            "city":"广州",
            "yxlogo":"http://pic.iask.cn/fimg/569205034253.jpg",
            "zynum":"17"
        },
        {
            "id":"12",
            "yxname":"五邑大学",
            "yxsx":"公办",
            "city":"江门",
            "yxlogo":"http://pic.iask.cn/fimg/169985034268.jpg",
            "zynum":"10"
        },
        {
            "id":"13",
            "yxname":"吉林大学珠海学院",
            "yxsx":"民办",
            "city":"珠海",
            "yxlogo":"http://pic.iask.cn/fimg/398695034261.jpg",
            "zynum":"29"
        },
        {
            "id":"14",
            "yxname":"仲恺农业工程学院",
            "yxsx":"公办",
            "city":"广州",
            "yxlogo":"https://p.pstatp.com/origin/ff690001b267aab6cf6d",
            "zynum":"21"
        },
        {
            "id":"15",
            "yxname":"广东海洋大学寸金学院",
            "yxsx":"民办",
            "city":"湛江",
            "yxlogo":"http://pic.iask.cn/fimg/621215034228.jpg",
            "zynum":"16"
        },
        {
            "id":"16",
            "yxname":"广州大学松田学院",
            "yxsx":"民办",
            "city":"广州",
            "yxlogo":"http://pic.iask.cn/fimg/86305034267.jpg",
            "zynum":"21"
        },
        {
            "id":"17",
            "yxname":"华南农业大学珠江学院",
            "yxsx":"民办",
            "city":"广州",
            "yxlogo":"http://pic.iask.cn/fimg/67915034256.jpg",
            "zynum":"17"
        },
        {
            "id":"18",
            "yxname":"岭南师范学院",
            "yxsx":"公办",
            "city":"湛江",
            "yxlogo":"http://pic.iask.cn/fimg/495655034263.jpg",
            "zynum":"20"
        },
        {
            "id":"19",
            "yxname":"韩山师范学院",
            "yxsx":"公办",
            "city":"潮州",
            "yxlogo":"http://pic.iask.cn/fimg/350335034252.jpg",
            "zynum":"24"
        },
        {
            "id":"20",
            "yxname":"广东技术师范大学天河学院",
            "yxsx":"民办",
            "city":"广州",
            "yxlogo":"http://pic.iask.cn/fimg/716045034248.jpg",
            "zynum":"9"
        },
        {
            "id":"21",
            "yxname":"中山大学新华学院",
            "yxsx":"民办",
            "city":"东莞",
            "yxlogo":"http://pic.iask.cn/fimg/369325034269.jpg",
            "zynum":"13"
        },
        {
            "id":"22",
            "yxname":"广东技术师范大学",
            "yxsx":"公办",
            "city":"广州",
            "yxlogo":"http://pic.iask.cn/fimg/128555034237.jpg",
            "zynum":"13"
        },
        {
            "id":"23",
            "yxname":"广东金融学院",
            "yxsx":"公办",
            "city":"广州",
            "yxlogo":"http://pic.iask.cn/fimg/25165034236.jpg",
            "zynum":"8"
        },
        {
            "id":"24",
            "yxname":"东莞理工学院城市学院",
            "yxsx":"民办",
            "city":"东莞",
            "yxlogo":"http://pic.iask.cn/fimg/349695034227.jpg",
            "zynum":"14"
        },
        {
            "id":"25",
            "yxname":"广东培正学院",
            "yxsx":"民办",
            "city":"广州",
            "yxlogo":"http://pic.iask.cn/fimg/704575034265.jpg",
            "zynum":"15"
        },
        {
            "id":"26",
            "yxname":"惠州学院",
            "yxsx":"公办",
            "city":"惠州",
            "yxlogo":"http://pic.iask.cn/fimg/195935034257.jpg",
            "zynum":"11"
        },
        {
            "id":"27",
            "yxname":"广东第二师范学院",
            "yxsx":"公办",
            "city":"广州",
            "yxlogo":"http://pic.iask.cn/fimg/594495034234.jpg",
            "zynum":"5"
        },
        {
            "id":"28",
            "yxname":"广东医科大学",
            "yxsx":"公办",
            "city":"湛江",
            "yxlogo":"http://pic.iask.cn/fimg/190995034246.jpg",
            "zynum":"8"
        },
        {
            "id":"29",
            "yxname":"广州商学院",
            "yxsx":"民办",
            "city":"广州",
            "yxlogo":"http://pic.iask.cn/fimg/759085034243.jpg",
            "zynum":"11"
        },
        {
            "id":"30",
            "yxname":"华南师范大学",
            "yxsx":"公办",
            "city":"佛山",
            "yxlogo":"http://pic.iask.cn/fimg/828825034255.jpg",
            "zynum":"2"
        },
        {
            "id":"31",
            "yxname":"广州航海学院",
            "yxsx":"公办",
            "city":"广州",
            "yxlogo":"http://pic.iask.cn/fimg/142945034251.jpg",
            "zynum":"5"
        },
        {
            "id":"32",
            "yxname":"东莞理工学院",
            "yxsx":"公办",
            "city":"东莞",
            "yxlogo":"http://pic.iask.cn/fimg/640645034241.jpg",
            "zynum":"6"
        },
        {
            "id":"33",
            "yxname":"佛山科学技术学院",
            "yxsx":"公办",
            "city":"佛山",
            "yxlogo":"http://pic.iask.cn/fimg/65475034232.jpg",
            "zynum":"3"
        },
        {
            "id":"34",
            "yxname":"中山大学北方学院",
            "yxsx":"民办",
            "city":"广州",
            "yxlogo":"http://pic.iask.cn/fimg/562915034264.jpg",
            "zynum":"4"
        },
        {
            "id":"35",
            "yxname":"电子科技大学中山学院",
            "yxsx":"民办",
            "city":"中山",
            "yxlogo":"http://pic.iask.cn/fimg/719895034230.jpg",
            "zynum":"3"
        },
        {
            "id":"36",
            "yxname":"广州工商学院",
            "yxsx":"民办",
            "city":"佛山",
            "yxlogo":"http://pic.iask.cn/fimg/815125034249.jpg",
            "zynum":"7"
        },
        {
            "id":"37",
            "yxname":"广东财经大学",
            "yxsx":"公办",
            "city":"广州",
            "yxlogo":"http://pic.iask.cn/fimg/815985034226.jpg",
            "zynum":"2"
        },
        {
            "id":"38",
            "yxname":"广州美术学院",
            "yxsx":"公办",
            "city":"广州",
            "yxlogo":"http://pic.iask.cn/fimg/498595034240.jpg",
            "zynum":"5"
        },
        {
            "id":"39",
            "yxname":"北京理工大学珠海学院",
            "yxsx":"民办",
            "city":"珠海",
            "yxlogo":"http://pic.iask.cn/fimg/675775034225.jpg",
            "zynum":"1"
        }
    ]
}

Author:TANKING
Date:2020-07-12
Web:https://www.likeyun.cn
WeChat:face6009

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