小程序自定义底部导航 custom-tab-bar完整实现代码附效果图

根据用户身份，动态设置底部的导航图标

 实现步骤：

第一步，先配置：app.json里面的 tabBar 的 custom 设置为 true，如图：这里需要注意的是，自定义 tabBar 中包含的页面，在这里的 list 页面路径也必须得有，其它字段可以不设置

相关代码：

{
  "pages": [
    "pages/msgList/msgList",
    "pages/index/index",
    "pages/login/login",
    "pages/user/user"
  ],
  "tabBar": {
    "custom": true,
    "color": "#7A7E83",
    "selectedColor": "#3cc51f",
    "borderStyle": "black",
    "backgroundColor": "#ffffff",
    "list": [
      {
        "pagePath": "pages/index/index",
        "text": ""
      },
      {
        "pagePath": "pages/msgList/msgList",
        "text": ""
      },
      {
        "pagePath": "pages/user/user",
        "text": ""
      }
    ]
  },
  "window": {
    "backgroundColor": "#F6F6F6",
    "backgroundTextStyle": "light",
    "navigationBarBackgroundColor": "#F6F6F6",
    "navigationBarTitleText": "",
    "navigationBarTextStyle": "black"
  },
  "style": "v2",
  "darkmode": true,
  "sitemapLocation": "sitemap.json",
  "useExtendedLib": {
    "weui": true
  }
}

第二步，创建组件：在项目跟目录创建文件夹：custom-tab-bar ，里面是自定义底部导航的组件文件：

 组件完整示例代码如下：

index.js

Component({
  data: {
    selected: 0,
    color: "#7A7E83",
    selectedColor: "#3cc51f",
    list: []
  },
  attached() {

    getApp().getUserInfo().then(res => {
      let userIdentity = res.userIdentity;
      console.log('userIdentity', userIdentity)
      userIdentity =2
      let arr1 = [{
        pagePath: "/pages/index/index",
        iconPath: "/images/icons/home.png",
        selectedIconPath: "/images/icons/home2.png",
        text: "首页"
      }, {
        pagePath: "/pages/msgList/msgList",
        iconPath: "/images/icons/message.png",
        selectedIconPath: "/images/icons/message2.png",
        text: "消息"
      }, {
        pagePath: "/pages/user/user",
        iconPath: "/images/icons/mine.png",
        selectedIconPath: "/images/icons/mine2.png",
        text: "我的"
      }]
      let arr2 = [{
        pagePath: "/pages/index/index",
        iconPath: "/images/icons/home.png",
        selectedIconPath: "/images/icons/home2.png",
        text: "首页"
      }, {
        pagePath: "/pages/user/user",
        iconPath: "/images/icons/mine.png",
        selectedIconPath: "/images/icons/mine2.png",
        text: "我的"
      }]
      this.setData({
        list: userIdentity == 1 ? arr1 : arr2
      })
    })
  },
  methods: {
    switchTab(e) {
      const data = e.currentTarget.dataset
      const url = data.path
      wx.switchTab({
        url
      })
      this.setData({
        selected: data.index
      })
    }
  }
})

index.json

{
  "component": true
}

index.wxml

<!--miniprogram/custom-tab-bar/index.wxml-->
<cover-view class="tab-bar">
  <cover-view class="tab-bar-border"></cover-view>
  <cover-view wx:for="{
   
   {list}}" wx:key="index" class="tab-bar-item" data-path="{
   
   {item.pagePath}}" data-index="{
   
   {index}}" bindtap="switchTab">
    <cover-image src="{
   
   {selected === index ? item.selectedIconPath : item.iconPath}}"></cover-image>
    <cover-view style="color: {
   
   {selected === index ? selectedColor : color}}">{
   
   {item.text}}</cover-view>
  </cover-view>
</cover-view>

index.wxss

.tab-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 48px;
  background: white;
  display: flex;
  padding-bottom: env(safe-area-inset-bottom);
}

.tab-bar-border {
  background-color: rgba(0, 0, 0, 0.33);
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 1px;
  transform: scaleY(0.5);
}

.tab-bar-item {
  flex: 1;
  text-align: center;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
}

.tab-bar-item cover-image {
  width: 27px;
  height: 27px;
}

.tab-bar-item cover-view {
  font-size: 10px;
}

第3步，使用组件，在第一个tab页面的onShow写0，根据 tabBar 的 List 的下标累加。

  onShow: function () {
    if (typeof this.getTabBar === 'function' && this.getTabBar()) {
      console.log('2222222')
      this.getTabBar().setData({
        selected: 0
      })
    }
  },

以上就完成了根据用户身份动态设置底部的导航图标的效果，如果还有疑问可以在评论区留言，对你有帮助的话点个赞吧~