HarmonyOS 自定义弹窗组件，builder 函数将组件作为值，传进去，第一次显示，@prop 数据不更新

在app中实现一个Toast组件功能，使用自定义弹窗组件进行二次封装，关键代码如下：

struct CustomerDialogToast{
  controller?: CustomDialogController;
  @Prop type:string = "info"
  @Prop info:string = ""
  build() {
    Column(){
      if(this.type=="info"){
        Text(this.info)
          .fontSize(CommonConstants.fontSize)
          .fontColor(CommonConstants.fontColorInfo).maxLines(1)
      }
      if (this.type=="loading"){

      }
    }
    .width(CommonConstants.toastWidth)
    .borderRadius(CommonConstants.borderRadius)
    .borderColor(CommonConstants.borderColor)
    .borderWidth(CommonConstants.borderWidth)
    .backgroundColor(CommonConstants.backgroundColor)
    .padding({
      top:CommonConstants.paddingTop,bottom:CommonConstants.paddingTop,
      left:CommonConstants.paddingLeft,right:CommonConstants.paddingLeft
    })
  }
}

@Component
export struct CustomDialogUser{
  @Prop type:string = "info"
  @Prop info:string = ""

  @Link @Watch('onShowUpdate') showToast:boolean;

  dialogController:CustomDialogController |null = new CustomDialogController({
    builder:CustomerDialogToast({type:this.type,info:this.info}),
    openAnimation: {
      duration: CommonConstants.DURATION,
      curve: Curve.Friction,
      delay: CommonConstants.DELAY,
      playMode: PlayMode.Alternate
    },
    closeAnimation: {
      duration: CommonConstants.DURATION,
      curve: Curve.Friction,
      delay: CommonConstants.DELAY,
      playMode: PlayMode.Alternate
    },
    alignment: DialogAlignment.Bottom,
    offset: { dx: 0, dy:  CommonConstants.offsetY},
    customStyle: true,
    cornerRadius:CommonConstants.cornerRadius,
    isModal: false
  })

  onShowUpdate(value:boolean){
    console.log("点击",this.showToast)
    this.info = this.info
    if(this.showToast){
      this.dialogController?.open()
      setTimeout(()=>{
        this.dialogController?.close()
        this.showToast = false
      },3000)
    }else{
      this.dialogController?.close()
      this.showToast = false
    }
  }
  aboutToDisappear(){
    this.dialogController = null
  }
  build() {
  }
}
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然后在其他组件引入CustomDialogUser。

build() {
  Column(){
    CustomDialogUser({ info: this.showInfo, type: "info",showToast:this.showToast })
  }
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在处理逻辑上

if(!this.isValidPhone){
  this.showInfo = "请输入正确手机号 ！"
  this.showToast = true
  return
}
if(!this.isChecked){
  this.showInfo = "请阅读并同意协议 ！"
  this.showToast = true
  return
}
if(!this.isCoded){
  this.showInfo = "请输入验证码 ！"
  this.showToast = true
  return
}
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第一次弹窗内容为空 ，直到第二次点击才显示 “请输入正确手机号”的提示，如何解决第一次文字提醒为空？