HarmonyOS tab组件无法刷新

@Require @Prop @Watch("viewModelUpdate") viewModel: CreditTradeViewModel
@State trendComponentParam: TrendComponentParam = new TrendComponentParam(this.viewModel.stockCode, this.viewModel.stockType, this.viewModel.stockName)
viewModelUpdate() {
  this.trendComponentParam.stockCode = this.viewModel.stockCode
  this.trendComponentParam.stockType = this.viewModel.stockType
  this.trendComponentParam.stockName = this.viewModel.stockName
}
TabContent() {
  if (IStockDetailService.instance() != null) {
    IStockDetailService.instance()!.getTrendChartComponent().builder(this.trendComponentParam)
  }
}

监听viewmodel的属性变化，更新组件的参数，但是这个组件一直无法刷新，断点发现，断点在if这句执行了，但是if里面那个不执行。而且可以肯定IStockDetailService.instance()这个实例是存在的。