[iOS] Fix issue that does not allow scrolling in WebView with PDF

src/Controls/samples/Controls.Sample.UITests/Issues/Issue18716.xaml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage 
+    xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" 
+    x:Class="Maui.Controls.Sample.Issues.Issue18716">
+  <Grid
+    RowDefinitions="*, Auto">
+    <WebView
+      x:Name="WaitForStubControl"
+      AutomationId="WaitForStubControl"
+      Source="https://freetestdata.com/wp-content/uploads/2021/09/Free_Test_Data_1MB_PDF.pdf">
+    </WebView>
+    <Label
+      x:Name="LoadedControl"
+      AutomationId="LoadedControl" />
+  </Grid>
+</ContentPage>

src/Controls/samples/Controls.Sample.UITests/Issues/Issue18716.xaml.cs

@@ -0,0 +1,30 @@
+using Microsoft.Maui.Controls;
+
+namespace Maui.Controls.Sample.Issues
+{
+	[Issue(IssueTracker.Github, 18716, "Touch events are not working on WebView when a PDF is displayed", PlatformAffected.iOS)]
+	public partial class Issue18716 : ContentPage
+	{
+		public Issue18716()
+		{
+			InitializeComponent();
+		}
+
+		protected override void OnAppearing()
+		{
+			base.OnAppearing();
+			WaitForStubControl.Navigating += OnWebViewNavigating;
+		}
+
+		protected override void OnDisappearing()
+		{
+			base.OnDisappearing();
+			WaitForStubControl.Navigating -= OnWebViewNavigating;
+		}
+
+		void OnWebViewNavigating(object sender, WebNavigatingEventArgs e)
+		{
+			LoadedControl.Text = "Ready";
+		}
+	}
+}

src/Controls/tests/UITests/Tests/Issues/Issue18716.cs

@@ -0,0 +1,30 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.AppiumTests.Issues
+{
+	public class Issue18716 : _IssuesUITest
+	{
+		public Issue18716(TestDevice device)
+			: base(device)
+		{ }
+
+		public override string Issue => "Touch events are not working on WebView when a PDF is displayed";
+
+		[Test]
+		[Category(UITestCategories.WebView)]
+		public void CanScrollWebView()
+		{
+			this.IgnoreIfPlatforms(new TestDevice[] { TestDevice.Android, TestDevice.Mac, TestDevice.Windows });
+
+			App.WaitForElement("LoadedControl", timeout: TimeSpan.FromSeconds(1));
+			var result = App.FindElement("LoadedControl").GetText();
+			Assert.AreEqual("Ready", result);
+
+			App.WaitForElement("WaitForStubControl");
+			App.ScrollDown("WaitForStubControl", ScrollStrategy.Gesture, 0.75);
+			App.Screenshot("Scrolling has been done correctly.");
+		}
+	}
+}

src/Core/src/Platform/iOS/LayoutView.cs

@@ -1,3 +1,5 @@
+using System;
+using System.Linq;
 using CoreGraphics;
 using UIKit;
 
@@ -6,7 +8,7 @@ namespace Microsoft.Maui.Platform
 	public class LayoutView : MauiView
 	{
 		bool _userInteractionEnabled;
-
+		
 		public override void SubviewAdded(UIView uiview)
 		{
 			InvalidateConstraintsCache();
@@ -26,9 +28,11 @@ public override void WillRemoveSubview(UIView uiview)
 			var result = base.HitTest(point, uievent);
 
 			if (result is null)
+			{
 				return null;
+			}
 
-			if (!_userInteractionEnabled && this.Equals(result))
+			if (!_userInteractionEnabled && Equals(result))
 			{
 				// If user interaction is disabled (IOW, if the corresponding Layout is InputTransparent),
 				// then we exclude the LayoutView itself from hit testing. But it's children are valid
@@ -37,11 +41,10 @@ public override void WillRemoveSubview(UIView uiview)
 				return null;
 			}
 
-			if (!result.UserInteractionEnabled)
+			if (Subviews.Contains(result) && !result.UserInteractionEnabled)
 			{
 				// If the child also has user interaction disabled (IOW the child is InputTransparent),
-				// then we also want to exclude it from the hit testing.
-
+				// then we also want to exclude it from the hit testing.					}
 				return null;
 			}
 

src/TestUtils/src/UITest.Appium/HelperExtensions.cs

@@ -34,11 +34,6 @@ public static void Click(this IApp app, string element)
 			app.FindElement(element).Click();
 		}
 
-		public static void Tap(this IApp app, string element)
-		{
-			app.FindElement(element).Click();
-		}
-
 		public static string? GetText(this IUIElement element)
 		{
 			var response = element.Command.Execute("getText", new Dictionary<string, object>()