HarmonyOS Tabs TabContent 包含Page,该Page页如何触发更新

build() {  
  Column() {  
    Tabs({  
      index: this.selectedIndex,  
      barPosition: BarPosition.End,  
    }) {  
      TabContent() {  
        HomePage()  
      }  
      .tabBar(this.TabBottom(MainViewModel.tabTitle[0], 0))  
  
      TabContent() {  
        SxxPage()  
      }  
      .tabBar(this.TabBottom(MainViewModel.tabTitle[1], 1))  
  
      TabContent() {  
        MinePage()  
      }  
      .tabBar(this.TabBottom(MainViewModel.tabTitle[2], 2))  
  
    }  
    .barMode(BarMode.Fixed)  
    .barWidth('100%')  
    .scrollable(false)  
    .barHeight($r('app.float.tab_bar_height'))  
    .onChange((index: number) => {  
      this.selectedIndex = index;  
      this.homeTabSelected = index  
    })  
  }  
}