HarmonyOS UI和ViewModel如何刷新数据

根据MVVM原则ViewMode请求数据，何时在page里调用vm的数据请求，vm返回一个Promise，这个数据又如何更新到PageUI上？

代码如下：

export class HomeViewModel {
  async getHomeNetData(): Promise<Array<HomeItem>> {
    let homeList: Array<HomeItem> = []
    await getHomeUI().then((listData: Array<HomeItem>) => {
      homeList = listData
    });
    return homeList
  }
}

页面

@Entry
@Component
export struct Home {
  @State homeList: Array<HomeItem> = []

  build() {
    Column() {
      List({ scroller: this.listScroller, space: 12 }) {
        ForEach(this.homeList, (item: HomeItem) => {
          ListItem() {
            HomeItemUI(item)
          }
        })
      }.listDirection(Axis.Vertical).lanes(2).margin({ left: 10, right: 10, top: 14 })
    }
  }
}