HarmonyOS 群头像生成的Demo

请参考以下示例：

import { JSON } from '@kit.ArkTS'

@Component
struct avatars {
  @Prop data: Array<Resource | string> = []
  @State data2: Array<Array<Resource | string>> = []
  @State imageSize: string = ''

  build() {
    Flex({
      wrap: FlexWrap.NoWrap,
      direction: FlexDirection.Column,
      justifyContent: FlexAlign.Center,
      alignContent: FlexAlign.Center,
    }) {
      ForEach(this.data2, (item: Array<Resource | string>, index: number) => {
        Flex({
          wrap: FlexWrap.NoWrap,
          justifyContent: FlexAlign.Center,
          alignContent: FlexAlign.Center,
        }) {
          ForEach(item, (item2: Resource | string, index2: number) => {
            Image(item2)
              .size({ width: this.imageSize, height: this.imageSize })
              .padding(1)
          })
        }
      }, (item: Resource | string, index: number) => JSON.stringify(item) + index)
    }
    .onAppear(() => {
      this.data2 = []
      let arr: Array<Resource | string> = []
      this.data.forEach((item: Resource | string) => {
        arr.push(item)
      })
      if (arr.length > 4) {
        this.imageSize = '33%'
        for (let index = 0; index < 3; index++) {
          this.data2.unshift(arr.splice(-3, 3))
        }
      } else if (arr.length > 1 && arr.length <= 4) {
        this.imageSize = '48%'
        for (let index = 0; index < 2; index++) {
          this.data2.unshift(arr.splice(-2, 2))
        }
      } else {
        this.data2.unshift(arr)
        this.imageSize = '98%'
      }
    })
    .width('100%')
    .height('100%')

  }
}


@Entry
@Component
struct Index {
  @State listData: Array<Array<Resource | string>> = [
    [$r('app.media.image')], [$r('app.media.image'), $r('app.media.image')],
    [$r('app.media.image'), $r('app.media.image'), $r('app.media.image')],
    [$r('app.media.image'), $r('app.media.image'), $r('app.media.image'), $r('app.media.image')],
    [$r('app.media.image'), $r('app.media.image'), $r('app.media.image'), $r('app.media.image'), $r('app.media.image')],
    [$r('app.media.image'), $r('app.media.image'), $r('app.media.image'), $r('app.media.image'), $r('app.media.image'),
      $r('app.media.image')],
    [$r('app.media.image'), $r('app.media.image'), $r('app.media.image'), $r('app.media.image'), $r('app.media.image'),
      $r('app.media.image'), $r('app.media.image')],
    [$r('app.media.image'), $r('app.media.image'), $r('app.media.image'), $r('app.media.image'), $r('app.media.image'),
      $r('app.media.image'), $r('app.media.image'), $r('app.media.image')],
    [$r('app.media.image'), $r('app.media.image'), $r('app.media.image'), $r('app.media.image'), $r('app.media.image'),
      $r('app.media.image'), $r('app.media.image'), $r('app.media.image'), $r('app.media.image')]
  ]
  build() {
    Column() {
      Column() {
        List() {
          ForEach(this.listData, (item: Array<Resource | string>) => {
            ListItem() {
              Column() {
                avatars({ data: item })
                  .width(44)
                  .height(44)
                  .backgroundColor('#cdcdcd')
              }
              .alignItems(HorizontalAlign.Start)
              .width('100%')
              .height(60)
              .padding({ top: 8, bottom: 8 })
            }
            .borderWidth({ bottom: 1 })
            .borderColor('#c4cacf')
            .width('100%')
            .margin({ bottom: 4 })
          })
        }
        .padding({ left: 10, right: 10 })
      }
    }
  }
}