鸿蒙官方Tabs是不支持居左对齐的，有时候我们希望我们的Tab能居左对齐，像这样

image.png

如果要自定义组件实现麻烦还容易出现各种BUG，网上也有自己现实的但是实在繁琐效果还不好，这里教大家一种我自己实践出来的简单方法，我们可以通过自定义Tab的最后一个标签的右边距来实现整个Tab控价的左移，但同时TabContent页面保持原位不动的效果，下边来看代码。

@Entry
@Component
struct TabsPage {

  @State tabBarArray: string[] = ["SUV","燃油车","新能源","插电混动"]
  @State currentIndex: number = 0;

  @Builder
  TabBuilder(index: number) {
    Column() {
      Text(this.tabBarArray[index])
        .textAlign(TextAlign.Center)
        .lineHeight(22)
        .fontSize(this.currentIndex == index ? 16 : 16)
        .fontWeight(this.currentIndex == index ? 600 : 400)
        .fontColor((this.currentIndex == index ? "#3B86F6" : "#333333"))

      Image(null)
        .backgroundColor("#3B86F6")
        .width(24)
        .height(2)
        .margin({ top: 6 })
        .visibility(this.currentIndex == index ? Visibility.Visible : Visibility.Hidden)
    }.alignItems(HorizontalAlign.Center).justifyContent(FlexAlign.Center)
    .margin({
      right: index == this.tabBarArray.length - 1 ? 80 : 0
    })
    .padding({ left: 12, right: 12})
  }

  build() {
    Tabs() {
      ForEach(this.tabBarArray, (tabsItem: string, index: number) => {
        TabContent() {
          Column() {
            Text(tabsItem)
          }.justifyContent(FlexAlign.Center).alignItems(HorizontalAlign.Center)
        }.tabBar(this.TabBuilder(index)).backgroundColor("#f00")
      })
    }
    .barHeight("7.2%")
    .barMode(BarMode.Scrollable)
    .barWidth("100%")
    .onChange((index: number) => {
      this.currentIndex = index
    })
    .vertical(false)
  }
}

如果我们要实现Tabs右边添加菜单，我们只需要按上边的方法让Tabs空出一部分距离，在相对布局中加入菜单即可，看代码

image.png

@Entry
@Component
struct TabsPage {

  @State tabBarArray: string[] = ["SUV","燃油车","新能源","插电混动"]
  @State currentIndex: number = 0;

  @Builder
  TabBuilder(index: number) {
    Column() {
      Text(this.tabBarArray[index])
        .textAlign(TextAlign.Center)
        .lineHeight(22)
        .fontSize(this.currentIndex == index ? 16 : 16)
        .fontWeight(this.currentIndex == index ? 600 : 400)
        .fontColor((this.currentIndex == index ? "#3B86F6" : "#333333"))

      Image(null)
        .backgroundColor("#3B86F6")
        .width(24)
        .height(2)
        .margin({ top: 6 })
        .visibility(this.currentIndex == index ? Visibility.Visible : Visibility.Hidden)
    }.alignItems(HorizontalAlign.Center).justifyContent(FlexAlign.Center)
    .margin({
      right: index == this.tabBarArray.length - 1 ? 80 : 0
    })
    .padding({ left: 12, right: 12})
  }

  build() {
    RelativeContainer(){
      Tabs() {
        ForEach(this.tabBarArray, (tabsItem: string, index: number) => {
          TabContent() {
            Column() {
              Text(tabsItem)
            }.justifyContent(FlexAlign.Center).alignItems(HorizontalAlign.Center)
          }.tabBar(this.TabBuilder(index)).backgroundColor("#f00")
        })
      }
      .barHeight("7.2%")
      .barMode(BarMode.Scrollable)
      .barWidth("100%")
      .onChange((index: number) => {
        this.currentIndex = index
      })
      .vertical(false)

      Image($r("app.media.app_icon")).width(20).height(20).alignRules({
        top: { anchor: "__container__", align: VerticalAlign.Top },
        right: { anchor: "__container__", align: HorizontalAlign.End }
      }).margin({right:16, top: 14})
    }.width("100%").height("100%")

  }
}