[iOS] Fix merge

Author: rmarinho

Xamarin.Forms.Platform.iOS/PageLifecycleManager.cs

@@ -81,6 +81,8 @@ public void HandlePageDisappearing()
 			_pageController.SendDisappearing();
 		}
 
+		public bool Appeared => _appeared;
+
 		bool CheckIfWeAreTheCurrentPage()
 		{
 			if (_pageController.RealParent is IPageContainer<Page> multipage)

Xamarin.Forms.Platform.iOS/Renderers/PageRenderer.cs

@@ -378,7 +378,7 @@ bool ShouldUseSafeArea()
 
 		void UpdateUseSafeArea()
 		{
-			if (Element == null)
+			if (Element == null || _pageLifecycleManager == null)
 				return;
 
 			if (_userOverriddenSafeArea)
@@ -387,7 +387,7 @@ void UpdateUseSafeArea()
 			if (!IsPartOfShell && !Forms.IsiOS11OrNewer)
 				return;
 
-			if (IsPartOfShell && !_appeared)
+			if (IsPartOfShell && !_pageLifecycleManager.Appeared)
 				return;
 
 			var tabThickness = _tabThickness;