[WIP] feat: Support for iOS SceneDelegate

src/SamplesApp/SamplesApp.netcoremobile/iOS/Info.plist

@@ -72,5 +72,22 @@
 	<string>Assets.xcassets/iconapp.appiconset</string>
 	<key>ITSAppUsesNonExemptEncryption</key>
 	<false/>
+	<key>UIApplicationSceneManifest</key>
+	<dict>
+		<key>UIApplicationSupportsMultipleScenes</key>
+		<true/>
+		<key>UISceneConfigurations</key>
+		<dict>
+			<key>UIWindowSceneSessionRoleApplication</key>
+			<array>
+				<dict>
+					<key>UISceneConfigurationName</key>
+					<string>__UNOPLATFORM_DEFAULT_CONFIGURATION</string>
+					<key>UISceneDelegateClassName</key>
+					<string>SceneDelegate</string>
+				</dict>
+			</array>
+		</dict>
+	</dict>
 </dict>
 </plist>

src/SamplesApp/SamplesApp.netcoremobile/iOS/Main.iOS.cs

@@ -1,21 +1,19 @@
 using UIKit;
 
-namespace SamplesApp.iOS
+namespace SamplesApp.iOS;
+
+public class Application
 {
-	public class Application
+	// This is the main entry point of the application.
+	static void Main(string[] args)
 	{
-		// This is the main entry point of the application.
-		static void Main(string[] args)
-		{
 #if __IOS__ && !__MACCATALYST__ && !TESTFLIGHT && !DEBUG
-			// requires Xamarin Test Cloud Agent
-			Xamarin.Calabash.Start();
+		// requires Xamarin Test Cloud Agent
+		Xamarin.Calabash.Start();
 #endif
 
-
-			// if you want to use a different Application Delegate class from "AppDelegate"
-			// you can specify it here.
-			UIApplication.Main(args, null, typeof(App));
-		}
+		// if you want to use a different Application Delegate class from "AppDelegate"
+		// you can specify it here.
+		UIApplication.Main(args, null, typeof(App));
 	}
 }

src/SamplesApp/SamplesApp.netcoremobile/iOS/SceneDelegate.cs

@@ -0,0 +1,15 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.UI.Xaml;
+using Foundation;
+using UIKit;
+
+namespace SamplesApp.iOS;
+
+[Register("SceneDelegate")]
+public class SceneDelegate : UnoSceneDelegate
+{
+}

src/Uno.UI/UI/Xaml/Application.iOS.cs

@@ -25,6 +25,8 @@
 	[Register("UnoAppDelegate")]
 	public partial class Application : UIApplicationDelegate
 	{
+		private const string UIApplicationSceneManifestKey = "UIApplicationSceneManifest";
+
 		private bool _preventSecondaryActivationHandling;
 
 		partial void InitializePartial()
@@ -142,6 +144,10 @@
 		[global::System.ComponentModel.EditorBrowsable(global::System.ComponentModel.EditorBrowsableState.Never)]
 		public NSString GetWorkingFolder() => new NSString(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData));
 
+		internal static bool HasSceneManifest() =>
+			(OperatingSystem.IsIOSVersionAtLeast(13, 0) || OperatingSystem.IsTvOSVersionAtLeast(13, 0)) &&
+			NSBundle.MainBundle.InfoDictionary.ContainsKey(new NSString(UIApplicationSceneManifestKey));
+
 		private bool TryHandleUniversalLinkFromUserActivity(NSUserActivity userActivity)
 		{
 			// If the application was not running, universal link was already handled by FinishedLaunching

src/Uno.UI/UI/Xaml/UnoSceneDelegate.iOS.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Foundation;
+using UIKit;
+
+namespace Microsoft.UI.Xaml;
+
+[Register(nameof(UnoSceneDelegate))]
+public class UnoSceneDelegate : UISceneDelegate
+{
+}