uniapp 自定义微信小程序 tabBar 导航栏

背景

做了一个校园招聘类小程序，使用 uniapp + vue3 + uview-plus + pinia 构建，这个小程序要实现多角色登录，根据权限动态切换 tab 栏文字、图标。

使用pages.json中配置tabBar无法根据角色动态配置 tabBar，因此自定义tabBar，根据下面的截图说明的几种自定义方案，第一种使用custom-tab-bar组件，这个只有 H5 支持，使用 view 自己绘制 tabBar 也可以，我采用微信小程序自定义tabBar 这个方式。

目标

实现一个自定义 tabBar，能够根据登录角色显示不同的导航栏

参考文档

参考 uniapp 关于自定义 tabBar 的说明，
uniapp 自定义tabbar
以及微信小程序自定义tabbar的文档
<a class= 微信小程序自定义tabbar" />

项目结构

效果图

效果图2 效果图1

实现过程

添加微信小程序custom-tab-bar组件
配置pages.json
引入pinia，创建store目录
创建tabData.ts文件，放置 tabBar 数据
创建tabs目录，标签栏对应的页面
创建标签页对应的组件
在App.vue中初始化

添加微信小程序`custom-tab-bar`组件

根据文档描述需要在根目录（cli 项目在 src 目录）下创建custom-tab-bar目录，里面是小程序wxml,wxss文件，不是vue文件。

我将custom-tab-bar组件的代码放在下面了，或者可以去微信小程序文档中下载示例代码

<!-- src/custom-tab-bar/index.wxml -->
<cover-view class="tab-bar"><!-- <cover-view class="tab-bar-border"></cover-view> --><cover-view wx:for="{{tabBar.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>

/* src/custom-tab-bar/index.js */
Component({data: {selected: 0,color: '#333333',selectedColor: '#1874F5',},methods: {switchTab(e) {const data = e.currentTarget.datasetconst url = '/' + data.pathwx.switchTab({url})this.setData({selected: data.index})}}
})

/* src/custom-tab-bar/index.wxss */
.tab-bar {position: fixed;left: 0;right: 0;bottom: 0;display: flex;padding-bottom: env(safe-area-inset-bottom);height: 96rpx;background: white;box-shadow: 0 -4px 16px 0 #00000014;z-index: 10000;
}.tab-bar-border {background-color: rgba(0, 0, 0, 0.33);position: absolute;left: 0;top: 0;width: 100%;height: 2rpx;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: 48rpx;height: 48rpx;
}.tab-bar-item cover-view {font-size: 20rpx;
}

// src/custom-tab-bar/index.json
{"component": true,"usingComponents": {}
}

配置`pages.json`

pages设置中需要引入tab对应的页面，否则在小程序中会报错

tabbar设置中添加 custom: true，list列表中的配置保留，后面在页面初始化时会被自定义 tabBar 数据覆盖

{"pages": [ //pages数组中第一项表示应用启动页，参考：https://uniapp.dcloud.io/collocation/pages{"path": "pages/tabs/tab1","style": {"navigationStyle": "custom"}},{"path": "pages/tabs/tab2","style": {"navigationStyle": "custom"}},{"path": "pages/tabs/tab3","style": {"navigationStyle": "custom"}},{"path": "pages/tabs/tab4","style": {"navigationStyle": "custom"}},{"path": "pages/index/index","style": {"navigationBarTitleText": "uni-app"}}],"tabBar": {"custom": true,"color": "#5F5F5F","selectedColor": "#07c160","borderStyle": "black","backgroundColor": "#F7F7F7","list": [{"pagePath": "pages/tabs/tab1","text": "按钮1","iconPath": "static/icon/icon-tab1.png","selectedIconPath": "static/icon/icon-tab1-active.png"},{"pagePath": "pages/tabs/tab2","text": "按钮2","iconPath": "static/icon/icon-tab2.png","selectedIconPath": "static/icon/icon-tab2-active.png"},{"pagePath": "pages/tabs/tab3","text": "按钮3","iconPath": "static/icon/icon-tab3.png","selectedIconPath": "static/icon/icon-tab3-active.png"},{"pagePath": "pages/tabs/tab4","text": "按钮4","iconPath": "static/icon/icon-tab4.png","selectedIconPath": "static/icon/icon-tab4-active.png"}]}
}

引入`pinia`，创建`store`目录

在状态库中增加 roleId 参数，根据 roleId 参数判断角色权限

// src/store/index.ts
import {defineStore} from 'pinia'const appStore = defineStore('app', {state: () => {return {roleId: '',}},actions: {setRoleId(id: string) {this.roleId = id},	}})

在main.ts中引入pinia

import { createSSRApp } from "vue";
import App from "./App.vue";import uviewPlus from "uview-plus";
import * as Pinia from "pinia";import "uno.css";export function createApp() {const app = createSSRApp(App);app.use(Pinia.createPinia())app.use(uviewPlus)return {app,Pinia};
}

创建`tabData.ts`文件

import useAppStore from '@/store/index'// tabBar的data
export const tabData = {selected: 0,//底部按钮高亮下标tabBar: {custom: true,color: '#5F5F5F',selectedColor: '#07c160',backgroundColor: '#F7F7F7',list: [] as any}
};// roleId == '01' 显示的导航栏
const list1 = [{pagePath: 'pages/tabs/tab1',text: '首页',iconPath: '/static/icon/icon-tab1.png',selectedIconPath: '/static/icon/icon-tab1-active.png'},{pagePath: 'pages/tabs/tab2',text: '标签2',iconPath: '/static/icon/icon-tab2.png',selectedIconPath: '/static/icon/icon-tab2-active.png'},{pagePath: 'pages/tabs/tab3',text: '标签3',iconPath: '/static/icon/icon-tab3.png',selectedIconPath: '/static/icon/icon-tab3-active.png'},{pagePath: 'pages/tabs/tab4',text: '我的',iconPath: '/static/icon/icon-tab4.png',selectedIconPath: '/static/icon/icon-tab4-active.png'}
];// roleId == '02' 显示的导航栏
const list2 = [{pagePath: 'pages/tabs/tab1',text: '推荐',iconPath: '/static/icon/icon-tab1.png',selectedIconPath: '/static/icon/icon-tab1-active.png'},{pagePath: 'pages/tabs/tab4',text: '我的',iconPath: '/static/icon/icon-tab4.png',selectedIconPath: '/static/icon/icon-tab4-active.png'}
];// 更新菜单
export const updateRole = (that: any, type: string) => {//这里设置权限if (type === '01') {tabData.tabBar.list = list1;} else {tabData.tabBar.list = list2;}tabData.selected = 0;useAppStore().setRoleId(type)updateTab(that);
};// 更新底部高亮
export const updateIndex = (that: any, index: number) => {tabData.selected = index;updateTab(that);
};// 更新Tab状态
export const updateTab = (that: any) => {if ((typeof that.getTabBar === 'function') && that.getTabBar()) {that.getTabBar().setData(tabData);}
};

创建`tabs`目录，标签栏对应的页面

以tab4为例，其他的 tab 页类似，根据roleId渲染符合条件的组件

<!-- src/pages/tabs/tab4.vue -->
<template><student-tab v-if="store.roleId === '01'" /><teacher-tab v-if="store.roleId === '02'" />
</template><script lang="ts" setup>
import { onShow } from '@dcloudio/uni-app'
import appStore from '@/store/index'
import { updateIndex } from '@/utils/tabData'import TeacherTab from '../teacher/tabView4.vue'
import StudentTab from '../student/tabView4.vue'const store = appStore();onShow(() => {// 获取页面对象const page = getCurrentPages()[0]// 更新tabBar选中状态updateIndex(page, store.roleId === '02' ? 1 : 3);
})
</script><style lang="scss" scoped></style>

创建标签页对应的组件

以下只是示例，增加了一个切换角色的按钮

<!-- src/pages/student/tabView1.vue -->
<template><!-- 状态栏占位 --><view class="status-bar"></view><view class="m-20">tabView1</view><view class="m-20"><up-button type="primary" text="切换角色" @click="changeRole"></up-button></view>
</template><script lang="ts" setup>
import { updateRole } from "@/utils/tabData";const changeRole = () => {const page = getCurrentPages()[0]updateRole(page, "02")
}
</script><style lang="scss" scoped></style>

在`App.vue`中初始化

<!-- src/App.vue -->
<script lang="ts" setup>
import { updateRole } from '@/utils/tabData'
import { onLaunch } from '@dcloudio/uni-app'onLaunch(() => {updateRole({}, '01')
})
</script>