HarmonyOS ImageKnife图片库加载问题？

Question

几张图片放在可以滑动的页面里，首次安装，加载网络图片，上面的图片能加载出来，底下的图片不显示，但是杀死重进就显示出来了。

Answer 1

建议使用lazyforeach来加载长列表内容，可以规避该问题，参考代码如下：

import { ImageKnifeComponent, ImageKnifeOption } from '@app/mpoinImageLoader';
import { MyData } from './MyData';

@Entry
@Component
struct Index {
  private dataSource: MyData = new MyData()
  option1:ImageKnifeOption = {
    loadSrc: 'xxxx',
    placeholderSrc: $r('app.media.app_icon'),
  }

  @State option2:ImageKnifeOption = {
    loadSrc: 'xxxx',
    placeholderSrc: $r('app.media.app_icon'),
  }

  private datas: ImageKnifeOption[] = [this.option1,this.option1,this.option1, this.option1, this.option1,this.option1,this.option1]

  aboutToAppear(): void {
    for (let i = 0; i <= 20; i++) {
      this.dataSource.pushData(this.option1)
    }
  }

  build() {
      LazyForEach(this.dataSource,(item: ImageKnifeOption, index: number) => {
        ListItem(){
          ImageKnifeComponent({imageKnifeOption: item}).width(200).height(200)
            .margin({ top: 10, left: 20, right: 20 })
        }
      })
    }
    .width('100%')
    .height('100%')
  }
}
import { ImageKnifeOption } from '@app/mpoinImageLoader';
export class MyData implements IDataSource {
  private listeners: DataChangeListener[] = [];
  private datas: ImageKnifeOption[] = []
  totalCount(): number {
    return this.datas.length
  }
  getData(index: number): ImageKnifeOption {
    return this.datas[index]
  }
  registerDataChangeListener(listener: DataChangeListener): void {
    if (this.listeners.indexOf(listener) < 0) {
      console.info('add listener');
      this.listeners.push(listener);
    }
  }
  unregisterDataChangeListener(listener: DataChangeListener): void {
    const pos = this.listeners.indexOf(listener);
    if (pos >= 0) {
      console.info('remove listener');
      this.listeners.splice(pos, 1);
    }
  }
  notifyDataReload(): void {
    this.listeners.forEach(listener => {
      listener.onDataReloaded();
    })
  }
  // 通知LazyForEach组件需要在index对应索引处添加子组件
  notifyDataAdd(index: number): void {
    this.listeners.forEach(listener => {
      listener.onDataAdd(index);
    })
  }
  // 通知LazyForEach组件在index对应索引处数据有变化，需要重建该子组件
  notifyDataChange(index: number): void {
    this.listeners.forEach(listener => {
      listener.onDataChange(index);
    })
  }
  // 通知LazyForEach组件需要在index对应索引处删除该子组件
  notifyDataDelete(index: number): void {
    this.listeners.forEach(listener => {
      listener.onDataDelete(index);
    })
  }
  // 通知LazyForEach组件将from索引和to索引处的子组件进行交换
  notifyDataMove(from: number, to: number): void {
    this.listeners.forEach(listener => {
      listener.onDataMove(from, to);
    })
  }
  public addData(index: number, data: ImageKnifeOption): void {
    this.datas.splice(index, 0, data);
    this.notifyDataAdd(index);
  }
  public pushData(data: ImageKnifeOption): void {
    this.datas.push(data);
    this.notifyDataAdd(this.datas.length - 1);
  }
}