feat: Pass arguments to LaunchActivatedEventArgs on macOS

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

@@ -87,7 +87,17 @@ public override void DidFinishLaunching(NSNotification notification)
 			}
 			if (!handled)
 			{
-				OnLaunched(new LaunchActivatedEventArgs());
+				var argumentsString = "";
+				if (NSProcessInfo.ProcessInfo?.Arguments is { } processArguments)
+				{
+					// First argument is just executable path
+					if (processArguments.Length > 1)
+					{
+						argumentsString = string.Join(" ", processArguments.Skip(1));
+					}
+				}
+
+				OnLaunched(new LaunchActivatedEventArgs(ActivationKind.Launch, argumentsString));
 			}
 		}
 

src/Uno.UWP/ApplicationModel/Activation/LaunchActivatedEventArgs.cs

@@ -21,38 +21,23 @@ internal LaunchActivatedEventArgs(ActivationKind kind, string arguments)
 #if !__ANDROID__ && !__IOS__
 		[NotImplemented]
 #endif
-		public ActivationKind Kind
-		{
-			get;
-		}
+		public ActivationKind Kind { get; } = ActivationKind.Launch;
 
 		/// <summary>
 		/// Defaults to NotRunning, may not be accurate in all cases for all platforms.
 		/// </summary>
-		public ApplicationExecutionState PreviousExecutionState { get; }
+		public ApplicationExecutionState PreviousExecutionState { get; } = ApplicationExecutionState.NotRunning;
 
 		[NotImplemented]
-		public SplashScreen SplashScreen
-		{
-			get;
-		}
+		public SplashScreen SplashScreen { get; } = new SplashScreen();
 
 		[NotImplemented]
-		public int CurrentlyShownApplicationViewId
-		{
-			get;
-		}
+		public int CurrentlyShownApplicationViewId { get; }
 
-		public string Arguments
-		{
-			get;
-		}
+		public string Arguments { get; } = "";
 
 		[NotImplemented]
-		public string TileId
-		{
-			get;
-		}
+		public string TileId { get; } = "App";
 
 		public bool PrelaunchActivated => false; // No platform other than UWP supports prelaunch yet.
 	}