[iOS/MacCatalyst] Fix IndicatorView not updating when IndicatorSize is changed to default value

src/Controls/tests/TestCases.HostApp/Issues/Issue35214.cs

@@ -0,0 +1,62 @@
+namespace Maui.Controls.Sample.Issues;
+
+[Issue(IssueTracker.Github, 35214, "Dynamically changing IndicatorView IndicatorSize to default value does not work", PlatformAffected.iOS | PlatformAffected.macOS)]
+public class Issue35214 : ContentPage
+{
+    public Issue35214()
+    {
+        var carouselItems = new List<string> { "Item 0", "Item 1", "Item 2" };
+
+        var indicatorView = new IndicatorView
+        {
+            AutomationId = "TestIndicatorView",
+            HorizontalOptions = LayoutOptions.Center,
+            IndicatorColor = Colors.Orange,
+            SelectedIndicatorColor = Colors.Blue,
+            IndicatorSize = 20,
+        };
+
+        var carouselView = new CarouselView
+        {
+            ItemsSource = carouselItems,
+            HeightRequest = 300,
+            HorizontalOptions = LayoutOptions.Fill,
+            IndicatorView = indicatorView,
+            ItemTemplate = new DataTemplate(() =>
+            {
+                var label = new Label
+                {
+                    VerticalOptions = LayoutOptions.Center,
+                    HorizontalOptions = LayoutOptions.Center,
+                    FontSize = 18,
+                };
+                label.SetBinding(Label.TextProperty, ".");
+                return label;
+            }),
+        };
+
+        var setDefaultSizeButton = new Button
+        {
+            AutomationId = "SetDefaultSizeButton",
+            Text = "Set IndicatorSize = 6 (Default)",
+            Margin = new Thickness(0, 20, 0, 0)
+        };
+
+        setDefaultSizeButton.Clicked += (s, e) =>
+        {
+            indicatorView.IndicatorSize = 6;
+        };
+
+        Content = new VerticalStackLayout
+        {
+            Padding = 20,
+            Spacing = 10,
+            Children =
+            {
+                carouselView,
+                indicatorView,
+                setDefaultSizeButton,
+            }
+        };
+    }
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue35214.cs

@@ -0,0 +1,31 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues;
+
+public class Issue35214 : _IssuesUITest
+{
+    public Issue35214(TestDevice device) : base(device)
+    {
+    }
+
+    public override string Issue => "Dynamically changing IndicatorView IndicatorSize to default value does not work";
+
+    [Test, Order(1)]
+    [Category(UITestCategories.IndicatorView)]
+    public void VerifyIndicatorSizeBeforeReset()
+    {
+        App.WaitForElement("TestIndicatorView");
+        VerifyScreenshot("IndicatorSizeBeforeReset", retryTimeout: TimeSpan.FromSeconds(2));
+    }
+
+    [Test, Order(2)]
+    [Category(UITestCategories.IndicatorView)]
+    public void VerifyIndicatorSizeAfterReset()
+    {
+        App.WaitForElement("SetDefaultSizeButton");
+        App.Tap("SetDefaultSizeButton");
+        VerifyScreenshot("IndicatorSizeAfterReset", retryTimeout: TimeSpan.FromSeconds(2));
+    }
+}

src/Core/src/Platform/iOS/MauiPageControl.cs

@@ -13,7 +13,7 @@ public class MauiPageControl : UIPageControl, IUIViewLifeCycleEvents
 
 		WeakReference<IIndicatorView>? _indicatorView;
 		bool _updatingPosition;
-		double _lastAppliedIndicatorSize = -1;
+		double _lastAppliedIndicatorSize = DefaultIndicatorSize;
 
 		public MauiPageControl()
 		{
@@ -65,7 +65,7 @@ public override void LayoutSubviews()
 
 		public void UpdateIndicatorSize()
 		{
-			if (IndicatorSize == 0 || IndicatorSize == DefaultIndicatorSize)
+			if (IndicatorSize == 0 || IndicatorSize == _lastAppliedIndicatorSize)
 				return;
 
 			if (Math.Abs(IndicatorSize - _lastAppliedIndicatorSize) < IndicatorSizeTolerance)