HarmonyOS 如何实时更新ForEach里的自定义组件

参考以下demo

@Observed class observerMap <k, v> extends Map<k, v> {

}

@Component
struct Day {
  @ObjectLink schema: observerMap<string, ResourceColor>
  @State title: string = ''
  build() {
    Text(this.title)
      .textAlign(TextAlign.Center)
      .backgroundColor(this.schema.has('key') ? this.schema.get('key') : Color.Orange)
  }
}


@Entry
@Component
struct Index2 {

  @State array: string[] = ['one','two']
  @State schema: observerMap<string, ResourceColor> = new observerMap<string, ResourceColor>()

  build() {
    Column({space:20}) {
      Button('observerMap change')
        .onClick(() => {
          this.schema.set('key', Color.Red)
        })

      Grid() {
        ForEach(this.array, (item:string, index:number)=> {
          GridItem() {
            Day({title:item,schema:this.schema})
          }
          .layoutWeight(1)
        })
      }
      .columnsTemplate('1fr 1fr')
      .rowsTemplate('1fr 1fr')
      .width('50%')
      .height(200)
      .flingSpeedLimit(360)
      .margin({ top: 8 })
    }
    .width('100%')
    .height('100%')
  }
}
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