HarmonyOS ArkTS Tab使用方法（十五）

一，使用方法

Android中Java代码使用fragment进行Tab切换，下面使用HarmonyOS ArkTS 语言实现Tab的使用，代码如下：

/*
 * 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.
 */

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

/**
 * Main page
 */
@Entry
@Component
struct MainPage {
  @State currentIndex: number = CommonConstants.HOME_TAB_INDEX;
  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() {
           //需要切换的tab，自己定义
      }
      .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, CommonConstants.HOME_TAB_INDEX,
        $r('app.media.home_selected'), $r('app.media.home_normal')))

      TabContent() {
          //需要切换的tab，自己定义
      }
      .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, CommonConstants.MINE_TAB_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;
    })
  }
}

二、效果图如下