[iOS][CV2] Fix Rotating the Simulator causes the text on the collection view to disappear.

src/Controls/src/Core/Handlers/Items2/iOS/LayoutFactory2.cs

@@ -503,6 +503,7 @@ class CustomUICollectionViewCompositionalLayout : UICollectionViewCompositionalL
 		ItemsLayout? _itemsLayout;
 		LayoutGroupingInfo? _groupingInfo;
 		LayoutHeaderFooterInfo? _headerFooterInfo;
+		CGSize _currentSize;
 
 		public CustomUICollectionViewCompositionalLayout(LayoutSnapInfo snapInfo, LayoutGroupingInfo? groupingInfo, LayoutHeaderFooterInfo? headerFooterInfo, UICollectionViewCompositionalLayoutSectionProvider sectionProvider, UICollectionViewCompositionalLayoutConfiguration configuration, ItemsLayout? itemsLayout) : base(sectionProvider, configuration)
 		{
@@ -555,6 +556,20 @@ void ForceScrollToLastItem(UICollectionView collectionView)
 			}
 		}
 
+		public override bool ShouldInvalidateLayoutForBoundsChange(CGRect newBounds)
+        {
+            // If the size hasn't changed, use the base implementation
+			if (newBounds.Size.IsCloseTo(_currentSize))
+            {
+                return base.ShouldInvalidateLayoutForBoundsChange(newBounds);
+            }
+
+            // Size has changed (e.g., rotation), so we need to invalidate the layout
+            // to ensure cells are properly measured and displayed
+            _currentSize = newBounds.Size;
+            return true;
+        }
+
 		public override CGPoint TargetContentOffset(CGPoint proposedContentOffset, CGPoint scrollingVelocity)
 		{
 			var snapPointsType = _snapInfo.SnapType;

src/Controls/tests/TestCases.HostApp/Issues/Issue32435.cs

@@ -0,0 +1,74 @@
+using Microsoft.Maui.Controls;
+using System.Collections.ObjectModel;
+
+namespace Maui.Controls.Sample.Issues;
+
+[Issue(IssueTracker.Github, 32435, "Rotating the Simulator causes the text on the collection view to disappear", PlatformAffected.iOS)]
+
+public class Issue32435 : ContentPage
+{
+    readonly ObservableCollection<string> items = new();
+    readonly CollectionView2 collectionView;
+
+    public Issue32435()
+    {
+        var rootGrid = new Grid
+        {
+            Margin = 20,
+            RowDefinitions =
+            {
+                new RowDefinition { Height = GridLength.Auto },
+                new RowDefinition { Height = GridLength.Auto },
+                new RowDefinition { Height = GridLength.Star }
+            }
+        };
+
+        var topStack = new StackLayout();
+        topStack.Add(new Label { Text = "CollectionView text should appear after rotating the device", AutomationId = "InstructionLabel" });
+        rootGrid.Add(topStack);
+        Grid.SetRow(topStack, 0);
+
+        var addButton = new Button
+        {
+            Text = "Add",
+			AutomationId = "AddButton",
+            HorizontalOptions = LayoutOptions.Start,
+            VerticalOptions = LayoutOptions.Start
+        };
+        addButton.Clicked += ButtonAdd_Clicked;
+        rootGrid.Add(addButton);
+        Grid.SetRow(addButton, 1);
+
+        var innerGrid = new Grid
+        {
+            RowDefinitions =
+            {
+                new RowDefinition { Height = GridLength.Auto },
+                new RowDefinition { Height = GridLength.Star }
+            }
+        };
+
+        collectionView = new CollectionView2
+        {
+            BackgroundColor = Colors.LightSalmon,
+            HeightRequest = 50,
+            ItemsLayout = new GridItemsLayout(ItemsLayoutOrientation.Horizontal)
+        };
+
+        innerGrid.Add(collectionView);
+        Grid.SetRow(collectionView, 0);
+
+        rootGrid.Add(innerGrid);
+        Grid.SetRow(innerGrid, 2);
+
+        items.Add("item: " + items.Count);
+        collectionView.ItemsSource = items;
+
+        Content = rootGrid;
+    }
+
+    void ButtonAdd_Clicked(object sender, System.EventArgs e)
+    {
+        items.Add("item: " + items.Count);
+    }
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue32435.cs

@@ -0,0 +1,24 @@
+#if TEST_FAILS_ON_CATALYST && TEST_FAILS_ON_WINDOWS    //Issue reproduce only when rotating device.
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+
+public class Issue32435 : _IssuesUITest
+{
+	public Issue32435(TestDevice device) : base(device) { }
+
+	public override string Issue => "Rotating the Simulator causes the text on the collection view to disappear";
+	[Test]
+	[Category(UITestCategories.CollectionView)]
+	public void VerifyCollectionViewTextShouldAppearAfterRotatingTheDevice()
+	{
+		App.WaitForElement("InstructionLabel");
+		App.Tap("AddButton");
+		App.SetOrientationLandscape();
+		App.SetOrientationPortrait();
+		VerifyScreenshot();
+	}
+}
+#endif