HarmonyOS 需要一个全局弹窗实现接口升级提示

参考示例代码：

// 1.封装1个弹框实例类CustomDialogLayou.ets
@CustomDialog
export struct CustomDialogLayout {
  controller?: CustomDialogController
  build() {
    Column() {
      Text('Global Custom Dialog Test')
    }
    .justifyContent(FlexAlign.Center)
    .alignItems(HorizontalAlign.Center)
    .height(400)
  }
}
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//2.在window的入口page（比如Index.ets）里import并创建实例
import { CustomDialogLayout } from './CustomDialogLayout'
dialogController: CustomDialogController | null = new CustomDialogController({
  builder: CustomDialogLayout({
  }),
  cancel: this.onCancel,
  autoCancel: true,
  alignment: DialogAlignment.Center,
})
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//3.在MainAbility.ts的onCreate方法里通过AppStorage定义关于弹框显示的全局属性，默认false不显示
AppStorage.setOrCreate('showGlobalCustomDialog', false)
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//4.在Index.ets里监听此属性值改变并进行拉起动作
@StorageLink('showGlobalCustomDialog') @Watch('globalCustomDialogStateChange') showGlobalCustomDialog: boolean = false
globalCustomDialogStateChange() {
  if (this.showGlobalCustomDialog) {
    if (this.dialogController != null) {
      this.dialogController.open()
      AppStorage.setOrCreate('showGlobalCustomDialog', false)
    }
  }
}
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//5.在需要调用的页面设置全局属性为true即可调起弹框
AppStorage.setOrCreate('showGlobalCustomDialog', true)
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