HarmonyOS鸿蒙Next中Swiper没有很方便的回调通知子组件刷新数据啊！

这个状态管理和事件订阅都可以搞定吧。刚打开页面，已算刷新一次。 状态管理，比如@Provide和@Consume组合，前后代或层级间同步。 事件订阅，比如emitter。用起来更灵活。 参考示例，只是做了状态同步，没有精细化，题主可以把@Provide和@Consume精细化，拆分成一个swiper子组件一对@Provide和@Consume。

import { emitter } from '@kit.BasicServicesKit';

// 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([]);
  private currentIndex: number = 4;

  [@Provide](/user/Provide) ('pageIndex') curIndex:number = -1;

  aboutToAppear(): void {
    let list: number[] = [];
    for (let i = 1; i <= 10; i++) {
      list.push(i);
    }
    this.data = new MyDataSource(list);
    // this.curIndex = this.currentIndex;
  }

  onPageShow(): void {
    console.log('方法：onPageShow')
    // this.curIndex = this.currentIndex;
  }

  onDidBuild(): void {
    this.curIndex = this.currentIndex;
    // emitter.emit(currentIndex)
  }

  build() {
    Column({ space: 5 }) {
      Swiper(this.swiperController) {
        LazyForEach(this.data, (item: string,index:number) => {
          MyComponent({ txt: item.toString(), myIndex:index})
        }, (item: string) => item)
      }
      .index(this.currentIndex)
      .loop(false)
      .onChange((index: number) => {
        this.currentIndex = index;
        this.curIndex = index;
        // emitter.emit(index)
      })


      Row({ space: 12 }) {
        Button('showNext')
          .onClick(() => {
            this.swiperController.showNext();
          })
          Button('showNext')
          .onClick(() => {
            // emitter.emit();
          })
        Button('showPrevious')
          .onClick(() => {
            this.swiperController.showPrevious();
          })
      }.margin(5)
    }.width('100%')
    .margin({ top: 5 })
  }
}

@Component
struct MyComponent {
  txt: string = "";
  myIndex: number = 0;

  [@Consume](/user/Consume) ('pageIndex') curIndex:number;
  private count:number = 0;

  aboutToAppear(): void {
    console.info('aboutToAppear txt:' + this.txt);
    // emitter.on(this.myIndex)
  }

  aboutToDisappear(): void {
    console.info('aboutToDisappear txt:' + this.txt);
    // emitter.off(this.myIndex);
  }

  build() {
    Text(this.txt+' '+(this.curIndex===this.myIndex?this.count++:this.myIndex))
      .width('90%')
      .height(160)
      .backgroundColor(0xAFEEEE)
      .textAlign(TextAlign.Center)
      .fontSize(30)
  }
}

首页不会触发onChange怎么办。。。