【鸿蒙Next】实现Tabbar 标签不满一屏靠左显示

解决的方案就是不用系统的tabbar😊

@Entry
@Component
struct CustomizeTheTabsBarAndItsAlignment {
  @State focusIndex: number = 0;
  private controller: TabsController = new TabsController();
  tabArray = [0, 1];

  // 自定义页签
  @Builder
  Tab(tabName: string, tabItem: number, tabIndex: number) {
    Column({ space: 20 }) {
      Text(tabName).fontSize(18)
    }
    .width(100)
    .height(60)
    .borderRadius({ topLeft: 10, topRight: 10 })
    .onClick(() => {
      this.controller.changeIndex(tabIndex);
      this.focusIndex = tabIndex;
    })
    .backgroundColor(tabIndex === this.focusIndex ? '#ffffffff' : '#ffb7b7b7')
  }

  build() {
    Column() {
      Column() {
        // 页签
        Row({ space: 6 }) {
          Scroll() {
            Row() {
              ForEach(this.tabArray, (item: number, index: number) => {
                this.Tab('页' + item, item, index);
              })
            }
            .justifyContent(FlexAlign.Start)
          }
          // 设置左对齐
          .align(Alignment.Start)
          .scrollable(ScrollDirection.Horizontal)
          .scrollBar(BarState.Off)
          .width('80%')
          .backgroundColor('#ffb7b7b7')
        }
        .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.Pink)
          })
        }
        .barHeight(0)
        .animationDuration(100)
        .onChange((index: number) => {
          console.log('foo change');
          this.focusIndex = index;
        })
      }
      .alignItems(HorizontalAlign.Start)
      .width('100%')
    }
    .height('100%')
  }
}