HarmonyOS 鸿蒙Next 两层Tabs嵌套滑动冲突问题

楼主看下这个方案可行，通过PanGesture和controller.changeIndex实现一二级Tabs切换，当二级Tabs 滑动到第一个或者最后一个tab的时候 ，切换到一级Tabs 。

Demo如下：

@Entry
@Component
struct TabsExample {
  @State fontColor: string = '#182431'
  @State selectedFontColor: string = '#007DFF'
  @State currentIndex: number = 0
  private controller: TabsController = new TabsController()

  @State subCurrentIndex: number = 0
  private subController: TabsController = new TabsController()

  private panOptionRight: PanGestureOptions = new PanGestureOptions({ direction: PanDirection.Left })
  private panOptionLeft: PanGestureOptions = new PanGestureOptions({ direction: PanDirection.Right })


  @Builder tabBuilder(index: number, name: string) {
    Column() {
      Text(name)
        .fontColor(this.currentIndex === index ? this.selectedFontColor : this.fontColor)
        .fontSize(16)
        .fontWeight(this.currentIndex === index ? 500 : 400)
        .lineHeight(22)
        .margin({ top: 17, bottom: 7 })
      Divider()
        .strokeWidth(2)
        .color('#007DFF')
        .opacity(this.currentIndex === index ? 1 : 0)
    }.width('100%')
  }

  @Builder subTabBuilder(index: number, name: string) {
    Column() {
      Text(name)
        .fontColor(this.subCurrentIndex === index ? this.selectedFontColor : this.fontColor)
        .fontSize(16)
        .fontWeight(this.subCurrentIndex === index ? 500 : 400)
        .lineHeight(22)
        .margin({ top: 17, bottom: 7 })
      Divider()
        .strokeWidth(2)
        .color('#007DFF')
        .opacity(this.subCurrentIndex === index ? 1 : 0)
    }.width('100%')
  }

  build() {
    Column() {
      Tabs({ barPosition: BarPosition.Start, index: this.currentIndex, controller: this.controller }) {
        TabContent() {
          Column().width('100%').height('100%').backgroundColor('#ffb554d7')
        }.tabBar(this.tabBuilder(0, '首页'))

        TabContent() {
          Column(){
            Tabs({ barPosition: BarPosition.Start,controller: this.subController }) {
              TabContent() {
                Column().width('100%').height('100%').backgroundColor('#00CB87')
                  // 左右拖动触发该手势事件
                  .gesture(
                    PanGesture(this.panOptionRight)
                      .onActionStart((event?: GestureEvent) => {
                        console.info('Pan start')
                      })
                      .onActionUpdate((event?: GestureEvent) => {
                        if (event) {
                        }
                      })
                      .onActionEnd(() => {
                        this.controller.changeIndex(2)
                        console.info('Pan end')
                      })

                  )
                  // .gesture(
                  //   PanGesture(this.panOptionLeft)
                  //     .onActionStart((event?: GestureEvent) => {
                  //       console.info('Pan start')
                  //     })
                  //     .onActionUpdate((event?: GestureEvent) => {
                  //       if (event) {
                  //       }
                  //     })
                  //     .onActionEnd(() => {
                  //       this.controller.changeIndex(0)
                  //       console.info('Pan end')
                  //     })
                  // )
              }.tabBar(this.subTabBuilder(3, 'pink'))
            }
            .vertical(false)
            .barMode(BarMode.Fixed)
            .barWidth(360)
            .barHeight(56)
            .animationDuration(400)
            .onChange((index: number) => {
              this.subCurrentIndex = index
            })
            .width(360)
            .backgroundColor('#F1F3F5')
          }
          .width('100%').height('100%').backgroundColor('#00CB87')
        }.tabBar(this.tabBuilder(1, '详情'))

        TabContent() {
          Column().width('100%').height('100%').backgroundColor('#ffc19757')
        }.tabBar(this.tabBuilder(2, '我的'))

      }
      .vertical(false)
      .barMode(BarMode.Fixed)
      .barWidth(360)
      .barHeight(56)
      .animationDuration(400)
      .onChange((index: number) => {
        this.currentIndex = index
      })
      .width(360)
      .height(296)
      .margin({ top: 52 })
      .backgroundColor('#F1F3F5')
    }.width('100%')
  }
}