Fix ScrollToPosition.Center behavior in ScrollView on iOS and MacCatalyst

src/Controls/tests/TestCases.HostApp/Issues/Bugzilla/Bugzilla44461.cs

@@ -7,18 +7,16 @@ public class Bugzilla44461 : ContentPage
 
 		public Bugzilla44461()
 		{
-			var grid = new Grid
-			{
-				RowSpacing = 0,
-			};
+			var stackLayout = new StackLayout();
+
 
 			var instructions = new Label
 			{
 				Text = @"Tap the first button (Button0). The button should be aligned with the left side of the screen "
 				+ "and should not move. If it's not, the test failed."
 			};
 
-			grid.Children.Add(instructions);
+			stackLayout.Add(instructions);
 
 			var scrollView = new ScrollView
 			{
@@ -27,9 +25,19 @@ public Bugzilla44461()
 				BackgroundColor = Colors.Yellow,
 				HeightRequest = 50
 			};
-			grid.Children.Add(scrollView);
 
-			var stackLayout = new StackLayout
+
+			var scrollButton = new Button
+			{
+				Text = "Scroll to Button0",
+				AutomationId = "Scroll to Button0",
+				Margin = 10,
+			};
+
+			stackLayout.Add(scrollButton);
+			stackLayout.Add(scrollView);
+
+			var horizontalStack = new StackLayout
 			{
 				Orientation = StackOrientation.Horizontal,
 				Spacing = 20
@@ -47,10 +55,16 @@ public Bugzilla44461()
 					scrollView.ScrollToAsync(sender as Button, ScrollToPosition.Center, true);
 				};
 
-				stackLayout.Children.Add(button);
+				horizontalStack.Children.Add(button);
 			}
-			scrollView.Content = stackLayout;
-			Content = grid;
+
+			scrollButton.Clicked += (sender, args) =>
+			{
+				var button = horizontalStack.Children[0];
+				scrollView.ScrollToAsync(button as Element, ScrollToPosition.Center, true);
+			};
+			scrollView.Content = horizontalStack;
+			Content = stackLayout;
 		}
 	}
-}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Bugzilla/Bugzilla44461.cs

@@ -1,6 +1,4 @@
-#if TEST_FAILS_ON_IOS && TEST_FAILS_ON_CATALYST   //When clicking Button0 (the first button) incorrectly centers it in the ScrollView instead of maintaining its left alignment.                                                                                                                                 
-//Issue Link: https://github.com/dotnet/maui/issues/26760
-using NUnit.Framework;
+using NUnit.Framework;
 using NUnit.Framework.Legacy;
 using UITest.Appium;
 using UITest.Core;
@@ -18,24 +16,10 @@ public Bugzilla44461UITests(TestDevice device)
 		public override string Issue => "ScrollToPosition.Center works differently on Android and iOS";
 
 		[Test]
-		[FailsOnIOSWhenRunningOnXamarinUITest("This test is failing, likely due to product issue")]
-		[FailsOnMacWhenRunningOnXamarinUITest("This test is failing, likely due to product issue")]
 		public void Bugzilla44461Test()
 		{
-			var positions = TapButton(0);
-			Assert.That(positions.initialPosition.X, Is.EqualTo(positions.finalPosition.X));
-			Assert.That(positions.finalPosition.X, Is.LessThanOrEqualTo(1));
-		}
-
-		(System.Drawing.Rectangle initialPosition, System.Drawing.Rectangle finalPosition) TapButton(int position)
-		{
-			var buttonId = $"{position}";
-			App.WaitForElement(buttonId);
-			var initialPosition = App.WaitForElement(buttonId).GetRect();
-			App.Tap(buttonId);
-			var finalPosition = App.WaitForElement(buttonId).GetRect();
-			return (initialPosition, finalPosition);
+			App.Tap("Scroll to Button0");
+			VerifyScreenshot();
 		}
 	}
-}
-#endif
+}

src/Core/src/Handlers/ScrollView/ScrollViewHandler.iOS.cs

@@ -108,10 +108,10 @@ public static void MapRequestScrollTo(IScrollViewHandler handler, IScrollView sc
 					return;
 				}
 
-				var availableScrollHeight = uiScrollView.ContentSize.Height - uiScrollView.Frame.Height;
-				var availableScrollWidth = uiScrollView.ContentSize.Width - uiScrollView.Frame.Width;
-				var minScrollHorizontal = Math.Min(request.HorizontalOffset, availableScrollWidth);
-				var minScrollVertical = Math.Min(request.VerticalOffset, availableScrollHeight);
+				var availableScrollHeight = Math.Max(uiScrollView.ContentSize.Height - uiScrollView.Frame.Height, 0);
+				var availableScrollWidth = Math.Max(uiScrollView.ContentSize.Width - uiScrollView.Frame.Width, 0);
+				var minScrollHorizontal = Math.Clamp(request.HorizontalOffset, 0, availableScrollWidth);
+				var minScrollVertical = Math.Clamp(request.VerticalOffset, 0, availableScrollHeight);
 				uiScrollView.SetContentOffset(new CGPoint(minScrollHorizontal, minScrollVertical), !request.Instant);
 
 				if (request.Instant)