AwareNavigationController.cs

public class AwareNavigationController : UINavigationController
{
    public event EventHandler PoppedViewController;

    public AwareNavigationController():base() {}
    public AwareNavigationController(UIViewController rootViewController):base(rootViewController){}
    public AwareNavigationController(IntPtr intPtr) : base(intPtr) { }
    public AwareNavigationController(NSCoder coder) : base(coder) { }
    public AwareNavigationController(NSObjectFlag t) : base(t) { }
    public AwareNavigationController(string nibName, NSBundle bundle) : base(nibName, bundle ) { }
    public AwareNavigationController(Type navigationBarType, Type toolbarType) : base(navigationBarType, toolbarType) { }

	public override UIViewController PopViewController(bool animated)
	{
        PoppedViewController?.Invoke(this, null);
        return base.PopViewController(animated);
	}
}