Hidden ListView doesn't appear as expected - fix

src/Controls/src/Core/Compatibility/Handlers/ListView/Android/ListViewRenderer.cs

@@ -239,6 +239,8 @@ protected override void OnElementPropertyChanged(object sender, PropertyChangedE
 				UpdateHorizontalScrollBarVisibility();
 			else if (e.PropertyName == ScrollView.VerticalScrollBarVisibilityProperty.PropertyName)
 				UpdateVerticalScrollBarVisibility();
+			else if (e.PropertyName == ListView.IsVisibleProperty.PropertyName)
+				UpdateVisibility();
 		}
 
 		/*
@@ -541,6 +543,17 @@ void UpdateHorizontalScrollBarVisibility()
 			Control.HorizontalScrollBarEnabled = newHorizontalScrollVisiblility == ScrollBarVisibility.Always;
 		}
 
+		private void UpdateVisibility()
+		{
+			if (Element.IsVisible)
+			{
+				if (Element.Parent is View parent)
+				{
+					parent.InvalidateMeasure();
+				}
+			}
+		}
+
 		void UpdateVerticalScrollBarVisibility()
 		{
 			if (_defaultVerticalScrollVisibility == 0)

src/Controls/src/Core/Compatibility/Handlers/ListView/iOS/ListViewRenderer.cs

@@ -310,6 +310,8 @@ protected override void OnElementPropertyChanged(object sender, PropertyChangedE
 				UpdateVerticalScrollBarVisibility();
 			else if (e.PropertyName == ScrollView.HorizontalScrollBarVisibilityProperty.PropertyName)
 				UpdateHorizontalScrollBarVisibility();
+			else if (e.PropertyName == ListView.IsVisibleProperty.PropertyName)
+				UpdateVisibility();
 		}
 
 		public override void TraitCollectionDidChange(UITraitCollection previousTraitCollection)
@@ -494,6 +496,17 @@ void UpdateFooter()
 			}
 		}
 
+		private void UpdateVisibility()
+		{
+			if (Element.IsVisible)
+			{
+				if (Element.Parent is View parent)
+				{
+					parent.InvalidateMeasure();
+				}
+			}
+		}
+
 		void UpdateHeader()
 		{
 			var header = ListView.HeaderElement;

src/Controls/tests/TestCases.HostApp/Issues/Issue27630.cs

@@ -0,0 +1,36 @@
+namespace Maui.Controls.Sample.Issues
+{
+	[Issue(IssueTracker.Github, 27630, "Hidden ListView doesn't appear as expected", PlatformAffected.iOS | PlatformAffected.Android)]
+	public class Issue27630 : TestContentPage
+	{
+		protected override void Init()
+		{
+			var listView = new ListView
+			{
+				HeightRequest = 100,
+				IsVisible = false,
+				ItemTemplate = new DataTemplate(() => new ViewCell()
+				{
+					View = new Label()
+					{
+						Text = "Hello",
+						AutomationId = "ViewCellLabel"
+					}
+				}),
+				ItemsSource = new string[] { "Item 1", "Item 2", "Item 3" }
+			};
+
+			var button = new Button
+			{
+				Text = "Show/Hide ListView",
+				AutomationId = "Button",
+				Command = new Command(() => listView.IsVisible = !listView.IsVisible)
+			};
+
+			Content = new VerticalStackLayout()
+			{
+				Children = { button, listView }
+			};
+		}
+	}
+}

src/Controls/tests/TestCases.Shared.Tests/Tests/Issues/Issue27630.cs

@@ -0,0 +1,26 @@
+#if ANDROID || IOS
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.TestCases.Tests.Issues
+{
+	public class Issue27630 : _IssuesUITest
+	{
+		public Issue27630(TestDevice testDevice) : base(testDevice)
+		{
+		}
+
+		public override string Issue => "Hidden ListView doesn't appear as expected";
+
+		[Test]
+		[Category(UITestCategories.ListView)]
+		public void ListViewShouldBeVisible()
+		{
+			App.WaitForElement("Button");
+			App.Click("Button");
+			App.WaitForElement("ViewCellLabel");
+		}
+	}
+}
+#endif