HarmonyOS 滑动距离onDidScroll方法 scrollOffset不对？

Question

list组件 实现 固定item 吸顶效果 滑动距离检测问题

想法实现：当滑动距离到固定item，onScrollInde 方法的 start 可以拿到

检测到滑动距离onDidScroll 方法 scrollOffset 不对

代码 如下：

onScrollIndex:(start: number, end: number, center: number)=>{
  console.log("  Applist  有子组件划入"
    + '   start :' + start
    + '   end :' + end
    + '   center :' + center
  )
},
  .onDidScroll( (scrollOffset: number, scrollState: ScrollState)=>{
    console.log("  Applist  滑动时触发"
      + '   scrollOffset :' + scrollOffset)
  }

Answer 1

参考如下代码：

@Entry
@Component
export struct EPage {
  @State arr: number[] = []
  @State isRefreshing: boolean = false
  @State listFlag: boolean = true
  private scroller: Scroller = new Scroller();

  @Styles
  listCard() {
    .backgroundColor(Color.White)
    .height(72)
    .width("100%")
    .borderRadius(12)
  }

  build() {

    Column() {
      Search()
      Scroll() {
        Column() {
          Text("Scroll Area")
            .width("100%")
            .height(60)
            .backgroundColor('#0080DC')
            .textAlign(TextAlign.Center)
          Refresh({ refreshing: $$this.isRefreshing}) {
            Scroll() {
              Column() {
                Image($r('app.media.startIcon'))
                  .width("100%")
                  .height(200)
                Tabs({ barPosition: BarPosition.Start }) {
                  TabContent() {
                    List({ space: 10, scroller: this.scroller }) {
                      ForEach(this.arr, (item: number) => {
                        ListItem() {
                          Text("item" + item)
                            .fontSize(16)
                        }.listCard()
                      }, (item: string) => item)

                      ListItem() {
                        CustomLayout()
                      }
                      .visibility(this.listFlag ?Visibility.Visible : Visibility.None)
                    }.width("100%")
                    .onReachEnd(() => {
                      setTimeout(() => {
                        this.listFlag = false
                      }, 2000)
                    })

                    .edgeEffect(EdgeEffect.Spring)
                    .nestedScroll({
                      scrollForward: NestedScrollMode.PARENT_FIRST,
                      scrollBackward: NestedScrollMode.SELF_FIRST
                    })
                  }.tabBar("Tab1")

                  TabContent() {
                  }.tabBar("Tab2")
                }
                .vertical(false)
                .height("100%")
              }
            }
            .nestedScroll({
              scrollForward: NestedScrollMode.SELF_FIRST,
              scrollBackward: NestedScrollMode.PARENT_FIRST
            })

            .edgeEffect(EdgeEffect.Spring)
            .friction(0.6)
            .backgroundColor('#DCDCDC')
            .scrollBar(BarState.Off)
            .width('100%')
            .height('100%')
          }
          .onRefreshing(() => {
            setTimeout(() => {
              this.isRefreshing = false
            }, 2000)
            console.log('onRefreshing test')
          })


        }.width("100%")
      }
      .edgeEffect(EdgeEffect.Spring)
      .friction(0.6)
      .backgroundColor('#DCDCDC')
      .scrollBar(BarState.Off)
      .width('100%')
      .height('100%')
    }
  }

  aboutToAppear() {
    for (let i = 0; i < 30; i++) {
      this.arr.push(i)
    }
  }
}

@Component
export default struct CustomLayout {

  build() {
    Row() {
      Image($r('app.media.ic_pull_up_load'))
        .width(18)
        .height(18)

      Text('加载中...')
        .margin({
          left: 7,
          bottom: 1
        })
        .fontSize(17)
        .textAlign(TextAlign.Center)
    }
    .clip(true)
    .width('100%')
    .justifyContent(FlexAlign.Center)
    .height(70)
  }
}