无法在卡片正常使用TextTimer组件

const storage = new LocalStorage();  
  
// 绑定  
@Entry(storage)  
@Component  
struct WidgetCard {  
  @LocalStorageProp('formId') formId: string = ''  
  @LocalStorageProp('formDimension') formDimension: number = 2  
  @LocalStorageProp('next') next: number = 0  
  textTimerController: TextTimerController = new TextTimerController()  
  @State format: string = 'mm:ss.SS'  
  
  build() {  
    Column() {  
      TextTimer({ isCountDown: true, count: 30000, controller: this.textTimerController })  
        .format(this.format)  
        .fontColor(Color.Black)  
        .fontSize(20)  
        .onTimer((utc: number, elapsedTime: number) => {  
          console.info('textTimer notCountDown utc is：' + utc + ', elapsedTime: ' + elapsedTime)  
        })  
        .onAppear(() => {  
          try {  
            console.info('wytest: enter onAppear')  
            this.textTimerController.start()  
          } catch (error) {  
            console.error('wytest: onAppear err.')  
          }  
        })  
  
      Row() {  
        Button("start").onClick(() => {  
          this.textTimerController.start()  
        })  
        Button("pause").onClick(() => {  
          this.textTimerController.pause()  
        })  
        Button("reset").onClick(() => {  
          this.textTimerController.reset()  
        })  
      }  
    }  
  }  
}