微信小程序自定义导航栏，实现不同用户角色登陆后显示不同的tabbar（避坑版）

news2025/1/21 9:21:38

在我们开发小程序的过程中，会遇到权限登录问题，不同的角色登录后显示的底部导航栏tabbar是不一样的。网上看到了很多的博客，多多少少会有些坑，会遇到问题。今天这篇博客就可以一次性解决。

了解概念

自定义tabbar

使用方法

app.json中声明custom字段为true

“custom”: true

"tabBar": {
    "custom": true,
    "selectedColor": "#3161ff",
    "list": [
      {
        "pagePath": "pages/index/index",
        "text": "检查",
        "iconPath": "./assets/tabbar/check.png",
        "selectedIconPath": "./assets/tabbar/check_select.jpg"
      },
      {
        "pagePath": "pages/approval/index",
        "text": "审批",
        "iconPath": "./assets/tabbar/approval.png",
        "selectedIconPath": "./assets/tabbar/approval_select.png"
      },
      {
        "pagePath": "pages/mine/index",
        "text": "我的",
        "iconPath": "./assets/tabbar/me.png",
        "selectedIconPath": "./assets/tabbar/me_select.png"
      }
    ]
  },

根目录添加入口文件

在根目录新建文件夹，名为custom-tab-bar（名字一定不能改）

在custom-tab-bar文件夹点击右键，新建Component，名字是index（这个也不能改，都是官方要求的，改了无法显示了）

编写代码

custom-tab-bar/index.wxml

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

custom-tab-bar/index.wxss

/* custom-tab-bar/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: 44rpx;
  height: 44rpx;
}

.tab-bar-item .cover-view {
  margin-top: 8rpx;
  font-size: 24rpx;
}

custom-tab-bar/index.js

// custom-tab-bar/index.js
Component({
  /**
   * 组件的属性列表
   */
  properties: {

  },

  /**
   * 组件的初始数据
   */
  data: {
    selectedColor: "#3161ff",
    allList: [
      [{
          "pagePath": "/pages/index/index",
          "text": "检查",
          "iconPath": "../assets/tabbar/check.png",
          "selectedIconPath": "../assets/tabbar/check_select.jpg",
          "selected": "index"
        },
        {
          "pagePath": "/pages/mine/index",
          "text": "我的",
          "iconPath": "../assets/tabbar/me.png",
          "selectedIconPath": "../assets/tabbar/me_select.png",
          "selected": "mine"
        }
      ],
      [{
          "pagePath": "/pages/index/index",
          "text": "检查",
          "iconPath": "../assets/tabbar/check.png",
          "selectedIconPath": "../assets/tabbar/check_select.jpg",
          "selected": "index"
        },
        {
          "pagePath": "/pages/approval/index",
          "text": "审批",
          "iconPath": "../assets/tabbar/approval.png",
          "selectedIconPath": "../assets/tabbar/approval_select.png",
          "selected": "approval"
        },
        {
          "pagePath": "/pages/mine/index",
          "text": "我的",
          "iconPath": "../assets/tabbar/me.png",
          "selectedIconPath": "../assets/tabbar/me_select.png",
          "selected": "mine"
        }
      ]
    ],
    selectList: []
  },
  /**
   * 生命周期方法
   */
  attached() {
    this.setData({
      selectList: this.data.allList[1]
    })
  },
  /**
   * 组件的方法列表
   */
  methods: {
    switchTab(e) {
      // console.log(e.currentTarget.dataset);
      let path = e.currentTarget.dataset.path;
      let selected = e.currentTarget.dataset.selected
      // console.log(e.currentTarget.dataset.selected);
      wx.switchTab({
        url: path,
      })
    }
  }
})

在每个Page的js文件中的onShow方法里，添加如下代码

pages\approval\index.js

onShow() {
    if(typeof this.getTabBar === 'function' &&
    this.getTabBar()) {
      this.getTabBar().setData({
        selected: "approval"
      })
    }
  },

以此类推

pages\index\index.js

onShow() {
    if(typeof this.getTabBar === 'function' &&
    this.getTabBar()) {
      this.getTabBar().setData({
        selected: "index"
      })
    }
  }

pages\mine\index.js

 onShow() {
    if (typeof this.getTabBar === 'function' &&
      this.getTabBar()) {
      this.getTabBar().setData({
        selected: "mine"
      })
    }
  },