在HarmonyOS NEXT开发中tab组件的页签该怎么实现？

Question

在HarmonyOS NEXT开发中tab组件的页签该怎么实现？

Answer 1

参考如下示例，点击页签，页签移动至最左端：

@Entry 
@Component 
struct Index { 
  @State tabArray: Array<number> = [0,1,2,3,4,5,6] 
  @State focusIndex: number = 0 
  private controller: TabsController = new TabsController() 
  scrollerForList: Scroller = new Scroller() 
 
  // 单独的页签 
  @Builder 
  Tab(tabName: string, tabItem: number, tabIndex: number) { 
    Column({ space: 20 }) { 
      Text(tabName).fontSize(18) 
    } 
    .width(100) 
    .height(30) 
    .borderRadius({ topLeft: 10, topRight: 10 }) 
    .onClick(() => { 
      this.controller.changeIndex(tabIndex) 
      this.focusIndex = tabIndex 
    }) 
    .backgroundColor(tabIndex === this.focusIndex ? "#ffffffff" : "#ffb7b7b7") 
  } 
 
  build() { 
    Column() { 
      // 页签 
      Row() { 
        List({ scroller: this.scrollerForList }) { 
          ForEach(this.tabArray, (item: number, index: number) => { 
            ListItem() { 
              this.Tab("页" + item, item, index) 
            } 
          }) 
        } 
        .listDirection(Axis.Horizontal) 
        .scrollBar(BarState.Off) 
      } 
      .height(30) 
      .justifyContent(FlexAlign.Start) 
      .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) 
        }) 
      } 
      .barMode(BarMode.Scrollable) 
      .barHeight(0) 
      .animationDuration(100) 
      .onChange((index: number) => { 
        this.focusIndex = index 
        // 使用scroller实现上下联动，具体滚动效果根据业务需要自行设计，以下为滚动示例 
        this.scrollerForList.scrollToIndex(index,true) 
      }) 
    } 
    .alignItems(HorizontalAlign.Start) 
    .width('100%') 
    .height('100%') 
  } 
}