[Net10] [iOS] Enable sizing back/flyout icon with the FontImageSource size property (#30962)

* FontImageSource

* - just use height as the bounding box not width

* - set to 24

* - change to 44

* - fix screen shots

---------

Co-authored-by: Shane Neuville <shneuvil@microsoft.com>

Author: kubaflo

src/Controls/src/Core/Compatibility/Handlers/NavigationPage/iOS/NavigationRenderer.cs

@@ -977,16 +977,27 @@ internal static void SetFlyoutLeftBarButton(UIViewController containerController
 			{
 				var icon = result?.Value;
 				var originalImageSize = icon?.Size ?? CGSize.Empty;
-				// Referred from the default hamburger size 
-				var defaultIconHeight = 23f;
-				var defaultIconWidth = 23f;
+
+				// The largest height you can use for navigation bar icons in iOS.
+				// Per Apple's Human Interface Guidelines, the navigation bar height is 44 points,
+				// so using the full height ensures maximum visual clarity and maintains consistency
+				// with iOS design standards. This allows icons to utilize the entire available
+				// vertical space within the navigation bar container.
+				var defaultIconHeight = 44f;
 				var buffer = 0.1;
+				// We only check height because the navigation bar constrains vertical space (44pt height),
+				// but allows horizontal flexibility. Width can vary based on icon design and content,
+				// while height must fit within the fixed navigation bar bounds to avoid clipping.
+				
 				// if the image is bigger than the default available size, resize it
 				if (icon is not null)
 				{
-					if (originalImageSize.Height - defaultIconHeight > buffer || originalImageSize.Width - defaultIconWidth > buffer)
+					if (originalImageSize.Height - defaultIconHeight > buffer)
 					{
-						icon = icon.ResizeImageSource(defaultIconWidth, defaultIconHeight, originalImageSize);
+						if (FlyoutPage.Flyout.IconImageSource is not FontImageSource fontImageSource || !fontImageSource.IsSet(FontImageSource.SizeProperty))
+						{
+							icon = icon.ResizeImageSource(originalImageSize.Width, defaultIconHeight, originalImageSize);
+						}
 					}
 					try
 					{

src/Controls/src/Core/Compatibility/Handlers/Shell/iOS/ShellPageRendererTracker.cs

@@ -465,15 +465,26 @@ void UpdateLeftToolbarItems()
 				{
 					icon = result?.Value;
 					var originalImageSize = icon?.Size ?? CGSize.Empty;
-					// Referred from the default hamburger size 
-					var defaultIconHeight = 23f;
-					var defaultIconWidth = 23f;
+
+					// The largest height you can use for navigation bar icons in iOS.
+					// Per Apple's Human Interface Guidelines, the navigation bar height is 44 points,
+					// so using the full height ensures maximum visual clarity and maintains consistency
+					// with iOS design standards. This allows icons to utilize the entire available
+					// vertical space within the navigation bar container.
+					var defaultIconHeight = 44f;
 					var buffer = 0.1;
+					// We only check height because the navigation bar constrains vertical space (44pt height),
+					// but allows horizontal flexibility. Width can vary based on icon design and content,
+					// while height must fit within the fixed navigation bar bounds to avoid clipping.
+					
 					// if the image is bigger than the default available size, resize it
 
-					if (icon is not null && originalImageSize.Height - defaultIconHeight > buffer || originalImageSize.Width - defaultIconWidth > buffer)
+					if (icon is not null && originalImageSize.Height - defaultIconHeight > buffer)
 					{
-						icon = icon.ResizeImageSource(defaultIconWidth, defaultIconHeight, originalImageSize);
+						if (image is not FontImageSource fontImageSource || !fontImageSource.IsSet(FontImageSource.SizeProperty))
+						{
+							icon = icon.ResizeImageSource(originalImageSize.Width, defaultIconHeight, originalImageSize);
+						}
 					}
 				}
 				else if (String.IsNullOrWhiteSpace(text) && IsRootPage && _flyoutBehavior == FlyoutBehavior.Flyout)