HarmonyOS ListItemGroup中ListItem数据有更新，如何刷新List？

将Group中的数据抽象成一个组件，在组件中传递Group所需的参数，代码：

@Observed
class ProjectArray extends Array<string>{
}

@Observed
class Subject {
  public title: string;
  public projects: ProjectArray;
  constructor(title, projects) {
    this.title = title;
    this.projects = projects;
  }
}

@Component
struct ViewA {
  title: string;
  @ObjectLink projects: ProjectArray;
  build() {
    Column() {
      Text(this.title)
      List(){
        ForEach(this.projects, (project) => {
          ListItem() {
            Text(project)
              .width("100%").height(100).fontSize(20)
              .textAlign(TextAlign.Center).backgroundColor(0xFFFFFF)
          }

        })
      }
    }
  }
}

@Entry
@Component
struct ListItemGroupExample2 {
  @State timetable: Subject[] = [
    new Subject('星期一', new ProjectArray('语文', '数学', '英语'))
  ]
  build() {
    Column() {
      Button('change')
        .onClick(() => {
          console.log('testTag: Change');
          this.timetable[0].projects.splice(0, 1, '英语');
        })
      ForEach(this.timetable, (table) => {
        ViewA({title: table.title, projects: table.projects})
      })

    }.width('100%').height('100%').backgroundColor(0xDCDCDC).padding({ top: 20 })
  }
}