[iOS] Fixed the crash occurred on CarouselView2 when deleting last one remaining item with loop as false

src/Controls/src/Core/Handlers/Items2/iOS/LoopObservableItemsSource2.cs

@@ -22,6 +22,16 @@ public LoopObservableItemsSource2(IEnumerable itemSource, UICollectionViewContro
 
 		protected override NSIndexPath[] CreateIndexesFrom(int startIndex, int count)
 		{
+			if (!Loop)
+			{
+				return base.CreateIndexesFrom(startIndex, count);
+			}
+			var collectionView = CollectionView;
+			if (collectionView is null || count < 0)
+			{
+				return Array.Empty<NSIndexPath>();
+			}
+
 			if (ItemCount == 0)
 			{
 				count += 2;

src/Controls/tests/TestCases.HostApp/Issues/Issue31535.cs

@@ -0,0 +1,131 @@
+using System.Collections.ObjectModel;
+
+namespace Maui.Controls.Sample.Issues;
+
+[Issue(IssueTracker.Github, 31535, "[iOS] Crash occurred on CarouselView2 when deleting last one remaining item with loop as false", PlatformAffected.iOS)]
+public class Issue31535 : ContentPage
+{
+    ObservableCollection<string> _items = new();
+    public ObservableCollection<string> Items
+    {
+        get => _items;
+        set
+        {
+            _items = value;
+            OnPropertyChanged();
+        }
+    }
+    public Issue31535()
+    {
+        // Start with empty collection to test all scenarios
+        Items = new ObservableCollection<string>();
+
+        // Create CarouselView
+        var carousel = new CarouselView2
+        {
+            Loop = false,
+            HeightRequest = 200,
+            ItemsSource = Items,
+            AutomationId = "TestCarouselView",
+            ItemTemplate = new DataTemplate(() =>
+            {
+                var border = new Border
+                {
+                    Margin = 10,
+                    WidthRequest = 200,
+                    BackgroundColor = Colors.Red
+                };
+
+                var label = new Label();
+                label.SetBinding(Label.TextProperty, ".");
+
+                border.Content = label;
+                return border;
+            })
+        };
+
+        // Create Buttons for testing different scenarios
+        var addSingleItemButton = new Button
+        {
+            AutomationId = "AddSingleItemButton",
+            Text = "Add Single Item"
+        };
+
+        var removeSingleItemButton = new Button
+        {
+            AutomationId = "RemoveSingleItemButton",
+            Text = "Remove Single Item"
+        };
+
+        var addMultipleItemsButton = new Button
+        {
+            AutomationId = "AddMultipleItemsButton",
+            Text = "Add Multiple Items"
+        };
+
+        var removeAllItemsButton = new Button
+        {
+            AutomationId = "RemoveAllItemsButton",
+            Text = "Remove All Items"
+        };
+
+        var itemCountLabel = new Label
+        {
+            Text = $"Items Count: {Items.Count}",
+            HorizontalOptions = LayoutOptions.Center
+        };
+
+        // Event handlers
+        addSingleItemButton.Clicked += (s, e) =>
+        {
+            Items.Add($"Item {Items.Count + 1}");
+            itemCountLabel.Text = $"Items Count: {Items.Count}";
+        };
+
+        removeSingleItemButton.Clicked += (s, e) =>
+        {
+            if (Items.Count > 0)
+            {
+                Items.RemoveAt(Items.Count - 1);
+                itemCountLabel.Text = $"Items Count: {Items.Count}";
+            }
+        };
+
+        addMultipleItemsButton.Clicked += (s, e) =>
+        {
+            var currentCount = Items.Count;
+            Items.Add($"Item {currentCount + 1}");
+            Items.Add($"Item {currentCount + 2}");
+            Items.Add($"Item {currentCount + 3}");
+            itemCountLabel.Text = $"Items Count: {Items.Count}";
+        };
+
+        removeAllItemsButton.Clicked += (s, e) =>
+        {
+            Items.Clear();
+            itemCountLabel.Text = $"Items Count: {Items.Count}";
+        };
+
+        Content = new VerticalStackLayout
+        {
+            Spacing = 10,
+            Padding = 20,
+            Children =
+            {
+                new Label
+                {
+                    Text = "CarouselView2 Loop=false Test",
+                    FontSize = 18,
+                    HorizontalOptions = LayoutOptions.Center
+                },
+                itemCountLabel,
+                carousel,
+                addSingleItemButton,
+                removeSingleItemButton,
+                addMultipleItemsButton,
+                removeAllItemsButton
+            }
+        };
+        BindingContext = this;
+    }
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue31535.cs

@@ -0,0 +1,25 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+
+public class Issue31535 : _IssuesUITest
+{
+    public Issue31535(TestDevice device) : base(device) { }
+
+    public override string Issue => "[iOS] Crash occurred on CarouselView2 when deleting last one remaining item with loop as false";
+
+    [Test]
+    [Category(UITestCategories.CarouselView)]
+    public void CarouselView2ShouldNotCrashOnRemovingItems()
+    {
+        App.WaitForElement("AddSingleItemButton");
+        App.Tap("AddSingleItemButton");
+        //remove one single item, crash should not occured
+        App.Tap("RemoveSingleItemButton");
+        App.Tap("AddMultipleItemsButton");
+        App.Tap("RemoveAllItemsButton");
+        App.WaitForElement("TestCarouselView");
+    }
+}