HarmonyOS 如何在ATabContent组件中点击一个按钮，切换到BTabContent组件中？

@Entry
@Component
struct MainPage {
  //监听IndexPage，更改的时候 执行 this.tabsController.changeIndex(this.currentIndex);
  @StorageLink('IndexPage') @Watch('changeIndex') currentIndex: number = 0;

  changeIndex() {
    this.tabsController.changeIndex(this.currentIndex);
  }

  private tabsController: TabsController = new TabsController();

  @Builder
  TabBuilder(title: string, index: number, selectedImg: Resource, normalImg: Resource) {
    Column() {
      Image(this.currentIndex === index ? selectedImg : normalImg)
        .width(25)
        .height(25)
      Text(title)
        .margin({ top: 4 })
        .fontSize(10)
        .fontColor(this.currentIndex === index ? Color.Red : Color.Gray)

    }.height(56)
    .onClick(() => {
      this.currentIndex = index;
      this.tabsController.changeIndex(this.currentIndex);
    })
  }

  build() {
    Tabs({ barPosition: BarPosition.End, controller: this.tabsController }) {
      TabContent() {
        Home()
      }.tabBar(this.TabBuilder('首页', 0, $r('app.media.ic_home_focus'), $r('app.media.ic_home_normal')))

      TabContent() {
        ShoppingCart()
      }.tabBar(this.TabBuilder('购物车', 1, $r('app.media.ic_cart_focus'), $r('app.media.ic_cart_normal')))

      TabContent() {
        Test()
      }.tabBar(this.TabBuilder('测试', 2, $r('app.media.ic_cart_focus'), $r('app.media.ic_cart_normal')))

    }.barHeight(56)
    .scrollable(false)
    .onChange((index: number) => {
      this.currentIndex = index;
    })
  }
}
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