HarmonyOS 关于onKeyEvent不生效问题

@Entry  
@Component  
struct CustomDialogPage {  
  controller: CustomDialogController = new CustomDialogController({ builder: CustomDialogExample({}) })  
  @Provide("isShowed") isShowed: boolean = false  
  @Provide("ifBanBack") ifBanBack: boolean = true  
  onBackPress() {  
    return this.ifBanBack  
  }  
  build() {  
    Column() { //自定义实现 Button('点击操作弹窗')  
      .onClick(() => {  
        this.isShowed = !this.isShowed  
      })  
        .visibility(this.isShowed ? Visibility.None : Visibility.Visible)  
      CustomExample().visibility(this.isShowed ? Visibility.Visible : Visibility.None)  
    }.width('100%').height('100%').justifyContent(FlexAlign.Center)  
  }  
}  
@Component  
struct CustomExample {  
  @Consume("isShowed") isShowed: boolean  
  @Consume("ifBanBack")  
  ifBanBack: boolean  
  
  build() {  
    Column() {  
      Text('This is the setting of textOverflow to Clip text content This is the setting of textOverflow to None text content.  This is the setting of textOverflow to Clip text content This is the setting of textOverflow to None text content.')   
      Blank()  
      Row() {  
        Button("拒绝").width(100)  
          .onClick(() => {  
            const context = getContext(this) as common.UIAbilityContext;  
            context.terminateSelf()//退出app }) Button('接受').width(100)   
              .onClick(() => {  
                this.isShowed = false  
                this.ifBanBack = false  
              })  
          }.width('100%').justifyContent(FlexAlign.SpaceAround).padding({ bottom: 10 })  
      }  
      .width('90%').height('70%').backgroundColor('#D5D5D5').borderRadius(10)  
    }  
  }