[iOS] Fix Gray Line Appears on the Right Side of GraphicsView with Decimal WidthRequest

src/Controls/tests/TestCases.HostApp/Issues/Issue25502.cs

@@ -0,0 +1,58 @@
+namespace Maui.Controls.Sample.Issues
+{
+
+	[Issue(IssueTracker.Github, 25502, "Gray Line Appears on the Right Side of GraphicsView with Decimal WidthRequest on iOS Platform", PlatformAffected.iOS)]
+	public class Issue25502 : ContentPage
+	{
+		public Issue25502()
+		{
+			GraphicsView graphicsView = new GraphicsView
+			{
+				AutomationId = "GraphicsView",
+				HeightRequest = 200.25,
+				WidthRequest = 248.25,
+				BackgroundColor = Colors.White,
+				Margin = new Thickness(20),
+			};
+			graphicsView.Drawable = new GraphicsDrawable(graphicsView);
+
+			Button changeColorButton = new Button
+			{
+				Text = "Click to change Color",
+				AutomationId = "ChangeColorButton"
+			};
+
+			changeColorButton.Clicked += ChangeColorButton_Clicked;
+
+			Content = new StackLayout
+			{
+				Spacing = 10,
+				Children =
+				{
+					graphicsView,
+					changeColorButton
+				}
+			};
+
+			void ChangeColorButton_Clicked(object sender, EventArgs e)
+			{
+				graphicsView.BackgroundColor = Colors.Yellow;
+			}
+		}
+
+		public class GraphicsDrawable : IDrawable
+		{
+			GraphicsView _graphicsView;
+			public GraphicsDrawable(GraphicsView graphicsView)
+			{
+				_graphicsView = graphicsView;
+			}
+
+			public void Draw(ICanvas canvas, RectF dirtyRect)
+			{
+				canvas.FillColor = _graphicsView.BackgroundColor;
+				canvas.FillRectangle(new RectF(dirtyRect.X, dirtyRect.Y + 40, dirtyRect.Width - 40, dirtyRect.Height - 40));
+			}
+		}
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue25502.cs

@@ -0,0 +1,24 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+	public class Issue25502 : _IssuesUITest
+	{
+		public Issue25502(TestDevice testDevice) : base(testDevice)
+		{
+		}
+
+		public override string Issue => "Gray Line Appears on the Right Side of GraphicsView with Decimal WidthRequest on iOS Platform";
+
+		[Test]
+		[Category(UITestCategories.GraphicsView)]
+		public void VerifyGraphicsViewWithoutGrayLine()
+		{
+			App.WaitForElement("ChangeColorButton");
+			App.Click("ChangeColorButton");
+			VerifyScreenshot();
+		}
+	}
+}

src/Core/src/Handlers/GraphicsView/GraphicsViewHandler.Android.cs

@@ -6,6 +6,15 @@ public partial class GraphicsViewHandler : ViewHandler<IGraphicsView, PlatformTo
 	{
 		protected override PlatformTouchGraphicsView CreatePlatformView() => new(Context);
 
+		// TODO : The modifier needs to be changed to public in the future.
+		internal static void MapBackground(IGraphicsViewHandler handler, IGraphicsView graphicsView)
+		{
+			if (graphicsView.Background is not null)
+            {
+                handler.PlatformView?.Invalidate();
+            }
+		}
+
 		public static void MapDrawable(IGraphicsViewHandler handler, IGraphicsView graphicsView)
 		{
 			handler.PlatformView?.UpdateDrawable(graphicsView);

src/Core/src/Handlers/GraphicsView/GraphicsViewHandler.Windows.cs

@@ -25,6 +25,15 @@ private protected override void OnDisconnectHandler(FrameworkElement platformVie
 			platformView.Loaded -= OnLoaded;
 		}
 
+		// TODO : The modifier needs to be changed to public in the future.
+		internal static void MapBackground(IGraphicsViewHandler handler, IGraphicsView graphicsView)
+		{
+			if (graphicsView.Background is not null)
+            {
+                handler.PlatformView?.Invalidate();
+            }
+		}
+
 		public static void MapDrawable(IGraphicsViewHandler handler, IGraphicsView graphicsView)
 		{
 			handler.PlatformView?.UpdateDrawable(graphicsView);

src/Core/src/Handlers/GraphicsView/GraphicsViewHandler.cs

@@ -12,6 +12,7 @@ public partial class GraphicsViewHandler : IGraphicsViewHandler
 	{
 		public static IPropertyMapper<IGraphicsView, IGraphicsViewHandler> Mapper = new PropertyMapper<IGraphicsView, IGraphicsViewHandler>(ViewHandler.ViewMapper)
 		{
+			[nameof(IView.Background)] = MapBackground,
 			[nameof(IGraphicsView.Drawable)] = MapDrawable,
 			[nameof(IView.FlowDirection)] = MapFlowDirection
 		};

src/Core/src/Handlers/GraphicsView/GraphicsViewHandler.iOS.cs

@@ -10,6 +10,15 @@ protected override PlatformTouchGraphicsView CreatePlatformView()
 			return new PlatformTouchGraphicsView();
 		}
 
+		// TODO : The modifier needs to be changed to public in the future.
+		internal static void MapBackground(IGraphicsViewHandler handler, IGraphicsView graphicsView)
+		{
+			if (graphicsView.Background is not null)
+            {
+                handler.PlatformView?.InvalidateDrawable();
+            }
+		}
+
 		public static void MapDrawable(IGraphicsViewHandler handler, IGraphicsView graphicsView)
 		{
 			handler.PlatformView?.UpdateDrawable(graphicsView);