微信小程序 自定义 tabBar_微信小程序自定义tabbar组件

自定义 tabBar | 微信开放文档

本文案例使用的Taro 非原生微信小程序

使用流程

1. 配置信息

• 在 app.json 中的 tabBar 项指定 custom 字段，同时其余 tabBar 相关配置也补充完整。
• 所有 tab 页的 json 里需声明 usingComponents 项，也可以在 app.json 全局开启。
  
  
  案例Taro项目文件：app.config.js:

  export default {
    pages: ['pages/hotel/index', 'pages/order/index', 'pages/room/index', 'pages/mine/index'],
    subPackages: [
      {
        root: 'subPages',
        pages: ['login/index',  'webView/index'],
      },
    ],
    tabBar: {
      custom: true,
      selectedColor: '#da4297',
      backgroundColor: '#fff',
      borderStyle: 'white',
      list: [
        {
          pagePath: 'pages/hotel/index',
          selectedIconPath: 'assets/img/tab/home-fill.png',
          iconPath: 'assets/img/tab/home-line.png',
          text: '首页',
        },
        {
          pagePath: 'pages/order/index',
          selectedIconPath: 'assets/img/tab/order-fill.png',
          iconPath: 'assets/img/tab/order-line.png',
          text: '订单',
        },
        {
          pagePath: 'pages/room/index',
          selectedIconPath: 'assets/img/tab/shop-fill.png',
          iconPath: 'assets/img/tab/shop-line.png',
          text: '商城',
        },
        {
          pagePath: 'pages/mine/index',
          selectedIconPath: 'assets/img/tab/mine-fill.png',
          iconPath: 'assets/img/tab/mine-line.png',
          text: '我的',
        },
      ],
    },
   
  };
  

  tabBar文件类目
  

2. 添加 tabBar 代码文件

在代码根目录下添加入口文件:

custom-tab-bar/index.js
custom-tab-bar/index.json
custom-tab-bar/index.wxml
custom-tab-bar/index.wxss

案例：使用的Taro 非原生微信小程序

 

3. 编写 tabBar 代码

用自定义组件的方式编写即可，该自定义组件完全接管 tabBar 的渲染。另外，自定义组件新增 getTabBar 接口，可获取当前页面下的自定义 tabBar 组件实例

index.jsx文件是自定义的tabBar 内容

import { ClassNames, ConstantList, StorageUtil } from '@/util';
import { CoverImage, CoverView } from '@tarojs/components';
import { inject, observer } from 'mobx-react';
import Taro from '@tarojs/taro';
import React, { Component } from 'react';
import './index.scss';
 
@inject('appStore')
@inject('initMod')
@observer
export default class StoreHome extends Component {
  constructor(props) {
    super(props);
    this.state = {
      color: '#979797',
      selectedColor: '#3D4DA4',
      // 自己定义的字段和内容
      list: [
        {
          pagePath: 'pages/hotel/index',
          selectedIconPath: '/assets/img/tab/home-fill.png',
          iconPath: '/assets/img/tab/home-line.png',
          text: '首页',
        },
        {
          pagePath: 'pages/order/index',
          selectedIconPath: '/assets/img/tab/order-fill.png',
          iconPath: '/assets/img/tab/order-line.png',
          text: '订单',
          requestLogin: true,
        },
        {
          appId: ConstantList.PASS_LOGIN_APPID,
          selectedIconPath: '/assets/img/tab/shop-fill.png',
          iconPath: '/assets/img/tab/shop-line.png',
          text: '商城',
        },
        {
          pagePath: 'pages/mine/index',
          // reallyPath:'/Coupon', 
          selectedIconPath: '/assets/img/tab/mine-fill.png',
          iconPath: '/assets/img/tab/mine-line.png',
          text: '我的',
          requestLogin: true,
        },
      ],
    };
  }
 
  switchTab = (data, index) => {
    // 如果需要登录 又没有token的话，则跳转到登录页
    const token = Taro.getStorageSync(ConstantList.TOKEN);
    if (data.requestLogin && !token) {
        Taro.navigateTo({
          url: `/subPages/login/index?redirectTo=/${data.pagePath}`,
        });
      return;
    }
 
    if (!data.building) {
      // 跳转其他小程序
      if (data.appId) {
        Taro.navigateToMiniProgram({
         // xxxxxxxxxxx
        });
      } else if (data.reallyPath) {
         // 跳转H5地址 xxxx
        this.props.initMod.changeSelectedTab(index); // 记录当前高亮tab
      } else {
        Taro.switchTab({ url: '/' + data.pagePath });
        this.props.initMod.changeSelectedTab(index);
      }
    } else {
      Taro.showToast({
        title: '该功能即将开放，敬请期待',
        icon: 'none',
        duration: 1000,
      });
    }
  };
 
  render() {
    const { list, selectedColor, color } = this.state;
    const { selectedTab } = this.props.initMod;
 
    return (
      <CoverView
        className={ClassNames('tab-bar', {
          'tab-bar_hide': this.props.appStore.state.hideTarBar
        })}>
        {list.map((item, index) => {
          return (
            <CoverView
              key={'tabBar' + index}
              className='tab-bar-item'
              onClick={() => {
                this.switchTab(item, index);
              }}>
              <CoverView className='tab-bar-box'>
                {item.iconPath && item.selectedIconPath && (
                  <CoverImage
                    className='image imageSelect'
                    src={selectedTab === index ? item.selectedIconPath : item.iconPath}></CoverImage>
                )}
                <CoverView
                  className='text'
                  style={{
                    color: selectedTab === index ? selectedColor : color,
                  }}>
                  {item.text}
                </CoverView>
              </CoverView>
            </CoverView>
          );
        })}
      </CoverView>
    );
  }
}

index.scss tabBar样式文件

 
.tab-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: $size-tabbar;
  background: white;
  display: flex;
  padding-bottom: env(safe-area-inset-bottom);
  border-radius: 28px 28px 0 0;
  background: #fff;
  box-shadow: 0 0 16px 0 rgba(0, 0, 0, 0.08);
  &_hide {
    display: none;
  }
  .tab-bar-item {
    flex: 1;
    text-align: center;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    padding: 10px 0;
 
    .tab-bar-box{
      width: 60px;
      margin: 0 auto;
      position: relative;
      .ring{
        position: absolute;
        display: block;
        width: 16px;
        height: 16px;
        background-color: $color-primary;
        border-radius: 50%;
        right: 0;
        top: 0;
        z-index: 20000;
      }
    }
    .image {
      width: 50px;
      height: 50px;
      margin: 0 auto;
 
    }
    .text {
      line-height: 30px;
      font-size: 20px;
      white-space: nowrap;
    }
  }
}

最终自定义样式效果