Ignore menu code pre iOS13

src/Core/src/Handlers/MenuBar/MenuBarHandler.iOS.cs

@@ -24,6 +24,9 @@ public override void SetVirtualView(IElement view)
 
 		void BuildNewMenu()
 		{
+			if (!OperatingSystem.IsIOSVersionAtLeast(13))
+				return;
+
 			UIMenu? lastFoundMenu = null;
 			foreach (var item in VirtualView)
 			{

src/Core/src/Handlers/MenuFlyoutItem/MenuFlyoutItemHandler.iOS.cs

@@ -52,6 +52,9 @@ internal static void Execute(UICommand uICommand)
 
 		internal static void Reset()
 		{
+			if (!OperatingSystem.IsIOSVersionAtLeast(13))
+				return;
+
 			menus.Clear();
 		}
 	}

src/Core/src/Handlers/Window/WindowHandler.iOS.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using ObjCRuntime;
 using UIKit;
 
@@ -22,6 +22,9 @@ public static void MapContent(IWindowHandler handler, IWindow window)
 
 		public static void MapMenuBar(IWindowHandler handler, IWindow view)
 		{
+			if (!OperatingSystem.IsIOSVersionAtLeast(13))
+				return;
+
 			if (MauiUIApplicationDelegate.Current != null &&
 				view is IMenuBarElement mb)
 			{

src/Core/src/Platform/iOS/MauiUIApplicationDelegate.Menu.cs

@@ -17,6 +17,9 @@ public override void BuildMenu(IUIMenuBuilder builder)
 
 			base.BuildMenu(builder);
 
+			if (!OperatingSystem.IsIOSVersionAtLeast(13))
+				return;
+
 			MenuBuilder = builder;
 
 			var window = Window ?? this.GetWindow() ??

src/Core/src/Platform/iOS/MenuExtensions.cs

@@ -43,6 +43,9 @@ internal static UIMenu ToPlatformMenu(
 			IMauiContext mauiContext,
 			IUIMenuBuilder? uIMenuBuilder)
 		{
+			if (String.IsNullOrWhiteSpace(title))
+				throw new ArgumentNullException(nameof(title), $"{menuElements} requires title text.");
+
 			uIMenuBuilder = uIMenuBuilder ??
 				MauiUIApplicationDelegate.Current.MenuBuilder!;