HarmonyOS 禁用滑动返回手势问题

参考如下：index页面：

import { AppRouter } from './AppRouter' 
import { AppDialog } from './AppDialog' 
import { PrivacyDialogViewBuilder } from './PrivacyDialogView'; 
import { DefaultDialog } from './DefaultDialog';

@Entry
@Component
struct Index {
  @Builder
  PageMap(name: string) {
    DefaultDialog()
  }
  build() {
    Navigation(AppRouter.getInstance().getPathStack()) {
      Stack({ alignContent: Alignment.Center }) {
        Column() {
          Button('基于Navigation实现自定义弹窗', { stateEffect: true, type: ButtonType.Capsule }).onClick(() => {
            AppDialog.build(wrapBuilder(PrivacyDialogViewBuilder))
              .onBackPressed((): boolean => true).open();
          })
        }
      }.height("100%").width("100%")
    }.hideTitleBar(true).navDestination(this.PageMap)
  }
}