[iOS] - Fix Custom FlyoutIcon from Being Overridden to Default Color in Shell

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

@@ -89,7 +89,7 @@ protected virtual void HandleShellPropertyChanged(object sender, PropertyChanged
 		{
 			if (e.Is(VisualElement.FlowDirectionProperty))
 				UpdateFlowDirection();
-			else if (e.Is(Shell.FlyoutIconProperty))
+			else if (e.Is(Shell.FlyoutIconProperty) || e.Is(Shell.ForegroundColorProperty))
 				UpdateLeftToolbarItems();
 		}
 
@@ -350,6 +350,12 @@ void UpdateLeftToolbarItems()
 				if (image != null)
 				{
 					icon = result?.Value;
+
+					var foregroundColor = _context.Shell.GetValue(Shell.ForegroundColorProperty);
+					if (foregroundColor is null)
+					{
+						icon = icon.ImageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal);
+					}
 				}
 				else if (String.IsNullOrWhiteSpace(text) && IsRootPage && _flyoutBehavior == FlyoutBehavior.Flyout)
 				{

src/Controls/tests/TestCases.HostApp/Issues/IssueShell6738.cs

@@ -0,0 +1,35 @@
+namespace Maui.Controls.Sample.Issues
+{
+	[Issue(IssueTracker.None, 6738, "The color of the custom icon in Shell always resets to the default blue", PlatformAffected.iOS | PlatformAffected.macOS)]
+	public class IssueShell6738 : TestShell
+	{
+		protected override void Init()
+		{
+			FlyoutBehavior = FlyoutBehavior.Flyout;
+			FlyoutIcon = "star_flyout.png";
+
+			ContentPage contentPage = new ContentPage
+			{
+				Content = new VerticalStackLayout
+				{
+					VerticalOptions = LayoutOptions.Center,
+					HorizontalOptions = LayoutOptions.Center,
+					Children =
+					{
+						new Label
+						{
+							AutomationId = "Label",
+							Text = "ContentPage Label"
+						}
+					}
+				}
+			};
+
+			Items.Add(new ShellContent
+			{
+				Title = "Home",
+				Content = contentPage
+			});
+		}
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/IssueShell6738.cs

@@ -0,0 +1,27 @@
+#if TEST_FAILS_ON_WINDOWS && TEST_FAILS_ON_ANDROID
+// Windows: The snapshot does not capture the FlyoutIcon applied to the TitleBar.
+// Android: The fix has not been implemented, so the icon defaults to white.
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+	public class IssueShell6738 : _IssuesUITest
+	{
+		public override string Issue => "The color of the custom icon in Shell always resets to the default blue";
+
+		public IssueShell6738(TestDevice testDevice) : base(testDevice)
+		{
+		}
+
+		[Test]
+		[Category(UITestCategories.Shell)]
+		public void EnsureCustomFlyoutIconColor()
+		{
+			App.WaitForElement("Label");
+			VerifyScreenshot();
+		}
+	}
+}
+#endif