HarmonyOS 使用Tabs其中的某一项点击需要跳转到某一页面而不是切换，这种如何实现？能不能阻止点击事件的默认执行逻辑？

Question

如题：HarmonyOS 使用Tabs其中的某一项点击需要跳转到某一页面而不是切换，这种如何实现？能不能阻止点击事件的默认执行逻辑？

Answer 1

tabBar没有点击拦截功能实现，可以使用TabsController自定义页签以及并在其中添加事件进行逻辑判断，

可以参考以下demo：

export class ButtonInfoModel {
  index: number = 0;
  info: string = 'home';
  title: string = 'Home';
}
const buttonInfo: ButtonInfoModel[] =
  [{ index: 0, info: 'home', title: 'Home' }, { index: 1, info: 'map', title: 'Map' },
    { index: 2, info: 'charging', title: 'Charging' }]

@Component
export struct Home {
  @State message: string = 'Home';

  build() {
    Row() {
      Column() {
        Text(this.message).fontSize(50).fontWeight(FontWeight.Bold)
        Text('点击之后无法进入charging页，会跳转map页').fontSize(20).fontWeight(FontWeight.Bold).onClick(() => {
          buttonInfo[2].info = "map"
        })
      }.width('100%')
    }.height('100%')
  }
}

@Component
export struct Map {
  @State message: string = 'Map';

  build() {
    Row() {
      Column() {
        Text(this.message).fontSize(50).fontWeight(FontWeight.Bold)
      }.width('100%')
    }.height('100%')
  }
}

@Component
export struct Charging {
  @State message: string = 'Charging';
  build() {
    Row() {
      Column() {
        Text(this.message).fontSize(50).fontWeight(FontWeight.Bold)
      }.width('100%')
    }.height('100%')
  }
}

@Entry
@Component
struct home {
  @StorageProp('currentBreakpoint') currentBreakpoint: string = 'sm';
  @State currentPageIndex: number = 0;
  @State tabArray: Array<number> = [0, 1, 2]
  private controller: TabsController = new TabsController()

  build() {
    Column() {
      Tabs({ barPosition: BarPosition.End, controller: this.controller }) {
        TabContent() {
          Home()
        }

        TabContent() {
          Map()
        }

        TabContent() {
          Charging()
        }
      }.barHeight('0vp').height('94%').vertical(this.currentBreakpoint === 'lg').scrollable(false)
      this.bottomNavigation()
    }.justifyContent(FlexAlign.SpaceBetween).backgroundColor("#f1f3f5")
  }

  @Builder
  bottomNavigation() {
    Row() {
      ForEach(this.tabArray, (item: number) => {
        this.BottomNavigation(buttonInfo[item])
      })
    }.height("50vp").backgroundColor(Color.White).justifyContent(FlexAlign.SpaceAround).width("100%")
  }
  @Builder
  BottomNavigation(button: ButtonInfoModel) {
    Column({ space: '10vp' }) {
      Text(button.title)
        .fontColor(this.currentPageIndex === button.index ? "#0587D7" : "#A5A9AD")
        .fontWeight(500)
        .textAlign(TextAlign.Center)
        .fontSize('10fp')
    }.alignItems(HorizontalAlign.Center).margin(-20).onClick(() => {
      if (button.index === 2 && button.info === 'map') {
        this.controller.changeIndex(1)
        this.currentPageIndex = 1
      } else {
        this.controller.changeIndex(button.index)
        this.currentPageIndex = button.index
      }
    })
  }
}