HarmonyOS 引用找不到方法

@Entry 
@Component 
export struct ExamFacePage { 
  public static Ins:ExamFacePage|null = null; 
  build() { 
    Column() { 
      Column() { 
        CustomNavigationWidget({ 
          title: { text: '人脸比对' }, 
          leftWidget: ExamFacePage.Ins?.test 
        }) 
        this.NormalPage() 
      } 
    }.width('100%') 
    .height('100%') 
  } 
  aboutToAppear(): void { 
    ExamFacePage.Ins = this; 
  } 
  @Builder 
  test() { 
    //做一些处理 
    Text('111111') 
  }