HarmonyOS Navigation页面出栈时，onShown是否执行

可以通uiObserver.on(‘navDestinationUpdate’，func)来进行监听，文档地址：https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V5/arkts-navigation-navigation-V5#%E9%A1%B5%E9%9D%A2%E7%9B%91%E5%90%AC%E5%92%8C%E6%9F%A5%E8%AF%A2

通过eventHub传递事件，文档地址：https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-inner-application-eventhub-V5

示例代码如下：

// index.ets
eventFunc() {
  console.log('eventFunc is called');
}

aboutToAppear() {
  if (!this.entryHapRouter) {
    this.entryHapRouter = new NavPathStack();
  }
  console.log("====Index=aboutToAppear=")
  let context = getContext() as common.UIAbilityContext;
  context.eventHub.on('myEvent', this.eventFunc);
  RouterModule.createRouter(RouterNameConstants.ENTRY_HAP, this.entryHapRouter);
};
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// EntryAbility.ets
windowStage.getMainWindow((err: BusinessError, data) => {
  let windowClass = data;
  let uiContext: UIContext = windowClass.getUIContext();

  let uiObserver: UIObserver = uiContext.getUIObserver();
  uiObserver.on("navDestinationUpdate", (info) => {
    // NavDestinationState.ON_SHOWN = 0, NavDestinationState.ON_HIDE = 1
    if (info.state == 0) {
      // NavDestination组件显示时操作
      console.info('page ON_SHOWN:' + info.name.toString());
      console.info('page ON_SHOW:' + info.navDestinationId.toString());
    } else if (info.state == 1) {
      console.info('page ON_HiDDEN:' + info.name.toString());
      console.info('page ON_HiDDEN:' + info.navDestinationId.toString());
      this.context.eventHub.emit('myEvent');
    }
  })
})
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