效果

代码说明

这一功能实现起来还是麻烦，需要自己实现，在uniapp中的pages.json底部加上就能实现，在这里需要自己写
引入三个内容页 Home,Car,Setting ，说明界面模块也行。引入 private tabsController: TabsController = new TabsController()。
构建一个tabuilder ,可以认为是一个function但function需要有属性以及build，这里相关的参数直接可以写入到 @Builder TabBuilder,

import CommonConstants from '../common/constants/CommonConstants';
import Home from "../view/Home"
import Car from "../view/Car"
import Setting from "../view/Setting"

/**
 * Main page
 */
@Entry
@Component
struct MainPage {
  @State currentIndex: number = CommonConstants.HOME_TAB_INDEX;//选中那一个底部tab
  private tabsController: TabsController = new TabsController();
  @Builder TabBuilder(title: string, index: number, selectedImg: Resource, normalImg: Resource) {
    Column() {
      Image(this.currentIndex === index ? selectedImg : normalImg)
        .width($r('app.float.mainPage_baseTab_size'))
        .height($r('app.float.mainPage_baseTab_size'))
      Text(title)
        .margin({ top: $r('app.float.mainPage_baseTab_top') })
        .fontSize($r('app.float.main_tab_fontSize'))
        .fontColor(this.currentIndex === index ? $r('app.color.mainPage_selected') : $r('app.color.mainPage_normal'))
    }
    .justifyContent(FlexAlign.Center)
    .height($r('app.float.mainPage_barHeight'))
    .width(CommonConstants.FULL_PARENT)
    .onClick(() => {
      this.currentIndex = index;
      this.tabsController.changeIndex(this.currentIndex);
    })
  }

  build() {
    Tabs({
      barPosition: BarPosition.End,
      controller: this.tabsController
    }) {

      TabContent() {
        Home()//将home view引入
      }
      .padding({ left: $r('app.float.mainPage_padding'), right: $r('app.float.mainPage_padding') })
      .backgroundColor($r('app.color.mainPage_backgroundColor'))
      .tabBar(this.TabBuilder(CommonConstants.HOME_TITLE/*首页*/, CommonConstants.HOME_TAB_INDEX/*index*/,$r('app.media.home_selected'), $r('app.media.home_normal')))

      TabContent() {
        Car()//将car view引入
      }
      .padding({ left: $r('app.float.mainPage_padding'), right: $r('app.float.mainPage_padding') })
      .backgroundColor($r('app.color.mainPage_backgroundColor'))
      .tabBar(this.TabBuilder(CommonConstants.MINE_CAR/*修车*/, CommonConstants.MINE_CAR_INDEX/*index*/, $r('app.media.car_selected'), $r('app.media.car_normal')))

      TabContent() {
        Setting()//将setting view引入
      }
      .padding({ left: $r('app.float.mainPage_padding'), right: $r('app.float.mainPage_padding') })
      .backgroundColor($r('app.color.mainPage_backgroundColor'))
      .tabBar(this.TabBuilder(CommonConstants.MINE_TITLE/*我的*/, CommonConstants.MINE_TAB_INDEX/*index*/, $r('app.media.mine_selected'), $r('app.media.mine_normal')))
    }
    .width(CommonConstants.FULL_PARENT)
    .backgroundColor(Color.White)
    .barHeight($r('app.float.mainPage_barHeight'))
    .barMode(BarMode.Fixed)
    .onChange((index: number) => {
      this.currentIndex = index;
    })
  }
}

公用的CommonConstants.ets ,这里的
static readonly HOME_TAB_INDEX = 0;
static readonly MINE_CAR_INDEX = 1;
static readonly MINE_TAB_INDEX = 2;是tab的索引。结合上面的 .tabBar(this.TabBuilder(CommonConstants.HOME_TITLE/首页/, CommonConstants.HOME_TAB_INDEX/index/,$r(‘app.media.home_selected’), $r(‘app.media.home_normal’)))表示选中那一个。

/*
 * Copyright (c) 2022 Huawei Device Co., Ltd.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * Common constants for all features.
 */
export default class CommonConstants {
  /**
   * Input length of the account.
   */
  static readonly INPUT_ACCOUNT_LENGTH = 11;

  /**
   *  Input length of the password.
   */
  static readonly INPUT_PASSWORD_LENGTH = 8;

  /**
   *  Left padding of the input box
   */
  static readonly INPUT_PADDING_LEFT = 0;

  /**
   * Delay time of simulated login
   */
  static readonly LOGIN_DELAY_TIME = 2000;

  /**
   * Common Spacing of Components
   */
  static readonly COMMON_SPACE = 12;

  /**
   * Title text of the home page
   */
  static readonly HOME_TITLE = '首页';

  /**
   * Title text of the setting page
   */
  static readonly MINE_TITLE = '我的';

  /**
   * Title text of the car page
   */
  static readonly MINE_CAR = '修改';

  /**
   * Spacing of other login methods
   */
  static readonly LOGIN_METHODS_SPACE = 44;

  /**
   * The width or height of the component is spread across the parent component.
   */
  static readonly FULL_PARENT = '100%';

  /**
   * The width of button
   */
  static readonly BUTTON_WIDTH = '90%';

  /**
   * The width of setting list
   */
  static readonly SET_LIST_WIDTH = '42%';

  /**
   * Home tab index
   */
  static readonly HOME_TAB_INDEX = 0;

  /**
   * Mine tab index
   */
  static readonly MINE_CAR_INDEX = 1;

  /**
   * Mine tab index
   */
  static readonly MINE_TAB_INDEX = 2;
}