HarmonyOS @CustomDialog自定义弹窗封装后在异步函数中不显示的问题

this.getStrings()  
new WTRHUD().showLoading()  
getStrings() {  
    let systemResourceManager = resourceManager.getSystemResourceManager();  
    systemResourceManager.getStringValue($r('sys.string.ohos_lab_vibrate').id).then((value: string) => {  
        this.mgr = value  
    }).catch((error: BusinessError) => {  
      console.error("systemResourceManager getStringValue promise error is " + error);  
    });  
  }

public static Ins:Index|null = null;  
aboutToAppear(): void {  
    Index.Ins = this;  
  }  
let systemResourceManager = resourceManager.getSystemResourceManager();  
systemResourceManager.getStringValue($r('sys.string.ohos_lab_vibrate').id).then((value: string) => {  
   if(Index.Ins){  
     Index.Ins.mgr = value  
   }  
}).catch((error: BusinessError) => {  
   console.error("systemResourceManager getStringValue promise error is " + error);  
});  
new WTRHUD().showLoading()