Tabs组件自定义导航栏UI问题

@Entry 
@Component 
struct Drag2 { 
  @State tabArray: Array<number> = [0, 1, 2] 
  @State focusIndex: number = 0 
  @State pre: number = 0 
  @State index: number = 0 
  private controller: TabsController = new TabsController() 
  @State test: boolean = false 
  @State icon: string = 'app.media.icon' 
 
  // @State marginBottom:number = 0 
  // 单独的页签 
 
  @Builder 
  Tab(tabName: string, tabItem: number, tabIndex: number) { 
    Row({ space: 10 }) { 
      Text(tabName).fontSize(18) 
      Stack() { 
        // Column().width(tabIndex === this.focusIndex ? 50:25 ).height(tabIndex === this.focusIndex ? 50:25).borderRadius(25).backgroundColor(Color.Red) 
        Image($r('app.media.local')) 
          .width(tabIndex === this.focusIndex ? 40 : 20).height(tabIndex === this.focusIndex ? 40 : 20) 
      } 
      .margin({ bottom: tabIndex === this.focusIndex ? 20 : 0 }) 
    } 
    .justifyContent(FlexAlign.Center) 
 
    .borderRadius({ topLeft: 10, topRight: 10 }) 
    .onClick(() => { 
      this.controller.changeIndex(tabIndex) 
      this.focusIndex = tabIndex 
    }) 
    .backgroundColor(tabIndex === this.focusIndex ? "#ffefb2b2" : "#ffb7b7b7") 
    .width(120) 
    .height(50) 
  } 
 
  build() { 
    Column() { 
      Column() { 
        // 页签 
        Row() { 
          Scroll() { 
            Row() { 
              ForEach(this.tabArray, (item: number, index: number) => { 
                this.Tab("页签 " + item, item, index) 
              }) 
            } 
            .margin({ top: 20 }) 
            .justifyContent(FlexAlign.SpaceBetween) 
          } 
          // .align(Alignment.Start) 
          .scrollable(ScrollDirection.Horizontal) 
          .scrollBar(BarState.Off) 
          .width('100%') 
          .backgroundColor("#ffb7b7b7") 
        } 
        .justifyContent(FlexAlign.SpaceBetween) 
        .width('100%') 
        .backgroundColor("#ffb7b7b7") 
 
        //tabs 
        Tabs({ barPosition: BarPosition.Start, controller: this.controller }) { 
          ForEach(this.tabArray, (item: number, index: number) => { 
            TabContent() { 
              Text('我是页面 ' + item + " 的内容") 
                .height(300) 
                .width('100%') 
                .fontSize(30) 
            } 
 
            .backgroundColor(Color.Blue) 
          }) 
        } 
 
        .barHeight(0) 
        .animationDuration(100) 
        .onChange((index: number) => { 
          console.log('foo change') 
          this.focusIndex = index 
        }) 
      } 
      .alignItems(HorizontalAlign.Start) 
      .width('100%') 
    } 
    .height('100%') 
  } 
}