HarmonyOS 自定义Canvas刷新和@ObservedV2如何配合刷新？

@ObservedV2  
export class BaseChartPickData {  
  //昨日收盘价格  
  @Trace preClosePrice: number  
  //240个点  
  @Trace themeKLineEntity: Array<TimeSharePointEntry>  
}  
@Component  
export struct HomeMiniFenShi {  
  @Prop preClosePrice?: number  
  // 240个点  
  @Prop themeKLineEntity?: Array<TimeSharePointEntry>  
  private miniModel: TimeChartModel | null = null;  
  private miniFenShiHelper: MiniFenShiView | null = null;  
  aboutToAppear(): void {  
    let miniModel4GlobalConfig = new GlobalChartConfig(ShowMode.COUNT)  
    miniModel4GlobalConfig.PAGE_SIZE = 241  
    this.miniModel = new TimeChartModel(miniModel4GlobalConfig);  
    this.miniFenShiHelper = new MiniFenShiView(this.miniModel);  
    this.miniFenShiHelper.setMode(false)  
    if (this.themeKLineEntity && this.preClosePrice) {  
      this.miniFenShiHelper.setNewData(this.getLineData(), this.preClosePrice)  
    }  
miniModel4GlobalConfig.addChildChartConfig(this.miniModel)  
  }  
  build() {  
    ChartView({ model: this.miniModel })  
      .width('100%')  
      .height('100%')  
  }