HarmonyOS 鸿蒙Next swiper轮播指示器怎么设置间距？

当前swiper自有的属性不支持设置指示器的间距，如果要设置间距，需要自定义UI来实现指示器，会比较复杂。 以下示例代码给出了样例供你参考：

// xxx.ets
class MyDataSource implements IDataSource {
  private list: number[] = []

  constructor(list: number[]) {
    this.list = list
  }

  totalCount(): number {
    return this.list.length
  }

  getData(index: number): number {
    return this.list[index]
  }

  registerDataChangeListener(listener: DataChangeListener): void {
  }

  unregisterDataChangeListener() {
  }
}@Entry
@Component
struct SwiperExample {
  private swiperController: SwiperController = new SwiperController()
  private data: MyDataSource = new MyDataSource([])

  @State widthLength:number=0
  @State heightLength:number=0
  @State currentIndex:number=0

  // 实现导航点自定义动画

  private swiperWidth: number = 0
  private getTextInfo(index: number): Record<string, number> {
    let strJson = getInspectorByKey(index.toString())
    try {
      let obj: Record<string, string> = JSON.parse(strJson)
      let rectInfo: number[][] = JSON.parse('[' + obj.$rect + ']')
      return { 'left': px2vp(rectInfo[0][0]), 'width': px2vp(rectInfo[1][0] - rectInfo[0][0]) }
    } catch (error) {
      return { 'left': 0, 'width': 0 }
    }
  }

  private getCurrentIndicatorInfo(index: number, event: TabsAnimationEvent): Record<string, number> {
    let nextIndex = index
    if (index > 0 && event.currentOffset > 0) {
      nextIndex--
    } else if (index < 3 && event.currentOffset < 0) {
      nextIndex++
    }
    let indexInfo = this.getTextInfo(index)
    let nextIndexInfo = this.getTextInfo(nextIndex)
    let swipeRatio = Math.abs(event.currentOffset / this.swiperWidth)
    let currentIndex = swipeRatio > 0.5 ? nextIndex : index // 页面滑动超过一半，swiper切换到下一页。
    let currentLeft = indexInfo.left + (nextIndexInfo.left - indexInfo.left) * swipeRatio
    let currentWidth = indexInfo.width + (nextIndexInfo.width - indexInfo.width) * swipeRatio
    return { 'index': currentIndex, 'left': currentLeft, 'width': currentWidth }
  }

  aboutToAppear(): void {
    let list: number[] = []
    for (let i = 1; i <= 6; i++) {
      list.push(i);
    }
    this.data = new MyDataSource(list)
  }build() {
  Column({ space: 5 }) {
    Stack({ alignContent: Alignment.Bottom }) {
      Swiper(this.swiperController) {
        LazyForEach(this.data, (item: string) => {
          Text(item.toString())
            .width('90%')
            .height(160)
            .backgroundColor(0xAFEEEE)
            .textAlign(TextAlign.Center)
            .fontSize(30)
        }, (item: string) => item)
      }
      .cachedCount(2)
      .index(0)
      .autoPlay(false)
      .interval(4000)
      .loop(true)
      .duration(1000)
      .itemSpace(0)
      .indicator(false)
      .curve(Curve.Linear)
      .onChange((index: number) => {
        console.info(index.toString())
        this.currentIndex=index
      })
      .onGestureSwipe((index: number, extraInfo: SwiperAnimationEvent) => {
        console.info("index: " + index)
        console.info("current offset: " + extraInfo.currentOffset)


        // 在页面跟手滑动过程中，逐帧触发该回调。
        let currentIndicatorInfo = this.getCurrentIndicatorInfo(index,extraInfo)
        this.currentIndex = currentIndicatorInfo.index
      })
      .onAnimationStart((index: number, targetIndex: number, extraInfo: SwiperAnimationEvent) => {
        console.info("index: " + index)
        console.info("targetIndex: " + targetIndex)
        console.info("current offset: " + extraInfo.currentOffset)
        console.info("target offset: " + extraInfo.targetOffset)
        console.info("velocity: " + extraInfo.velocity)
        // 切换动画开始时触发该回调。下划线跟着页面一起滑动，同时宽度渐变。
        this.currentIndex = targetIndex

      })
      .onAnimationEnd((index: number, extraInfo: SwiperAnimationEvent) => {
        console.info("index: " + index)
        console.info("current offset: " + extraInfo.currentOffset)
      })Row() {
        LazyForEach(this.data, (item: string, index: number) => {
          Column()
            .width(this.currentIndex===index?15:5)
            .height(5)
              // 实现设置指示器的间距
            .margin(15)
            .borderRadius(5)
            .backgroundColor(this.currentIndex===index?Color.Red:Color.Gray)
        }, (item: string) => item)
      }
      .margin({bottom:4})
    }
  }.width('100%')
  .margin({ top: 5 })
}
}