How to know the popped state of a NavigationPage in Xamarin

Question

I want it to popup or not to popup by receiving the On and Off events.

I received the On event and popped it up. Off event has [await Navigation.PopAllPopupAsync(false); ] to clear the popup.

There are cases where the off event comes in twice. If there is no currently popped page, await Navigation.PopAllPopupAsync(false); will throw an exception. So I want to know if there is a flag to know if there is currently popped screen.

How to know which page is currently popped up

Answer 1

Fix #1:

You could make the exception harmless:

    try
    {
      await Navigation.PopAllPopupAsync(false);
    }
    catch (Exception ex)
    {
    }

---

Fix #2:

You could keep track of it yourself:

public static bool PopupIsShowing;


  // In On event, Just before (or just after) you show it.
  PopupIsShowing = true;


  // In Off event,
  if (PopupIsShowing) {
    PopupIsShowing = false;
    await Navigation.PopAllPopupAsync(false);
  }