HarmonyOS Tabs组件如何支持标题居左，右边支持添加自定义组件

Tabs组件目前暂不支持自定义页签布局。要实现导航栏自定义布局，可以通过其他组件和Tabs组件或Swiper组件联动实现。

可以参考文档demo：https://developer.huawei.com/consumer/cn/doc/harmonyos-faqs-V5/faqs-arkui-5-V5

或以下demo

@Entry
@Component
struct Drag2 {
  @State tabArray: Array<number> = [0, 1]
  @State countArray: Array<number> = [87, 100]
  @State tabTitels: Array<string> = ['转发', '评论', '赞']
  @State focusIndex: number = 0
  @State index: number = 0
  private controller: TabsController = new TabsController()

  // 单独的页签
  @Builder
  Tab(tabName: string, tabItem: number, tabIndex: number, count: number) {
    Row({ space: 5 }) {
      Text(tabName).fontSize(18)
        .fontColor(tabIndex === this.focusIndex ? Color.Black : Color.Grey)
      Text(count + '').fontSize(18)
        .fontColor(tabIndex === this.focusIndex ? Color.Black : Color.Grey)
    }
    .constraintSize({ minWidth: 35 })
    .width(60)
    .height(30)
    .onClick(() => {
      console.log('sadsaadssa')
      this.controller.changeIndex(tabIndex)
      this.focusIndex = tabIndex
    })

  }

  build() {
    Column() {
      Column() {
        // 页签
        Row({ space: 5 }) {
          Scroll() {
            Row() {
              ForEach(this.tabArray, (item: number, index: number) => {
                this.Tab(this.tabTitels[index], item, index, this.countArray[index])
              })
            }
            .width('45%')
            .justifyContent(FlexAlign.SpaceBetween)
          }
          .align(Alignment.Start)
          .scrollable(ScrollDirection.Horizontal)
          .scrollBar(BarState.Off)
          .width('80%') // 在左的两个占总宽度的比例

          this.Tab("赞", 2, 2, 50);
        }
        .width('100%')

        //tabs
        Tabs({ barPosition: BarPosition.Start, controller: this.controller }) {
          TabContent() {
            // TabComponent1()
          }

          TabContent() {
            // TabComponent2();
          }

          TabContent() {
            Text('我是页面 ').height(300).width('100%').fontSize(30)
          }
        }
        .barHeight(0)
        .scrollable(false)
        .animationDuration(100)
        .onChange((index: number) => {
          console.log('foo change')
          this.focusIndex = index
        })
      }
    }
  }
}