Extend StandardRuntimePlatform with more apple platforms

src/Avalonia.Base/Compatibility/OperatingSystem.cs

@@ -8,7 +8,9 @@ namespace Avalonia.Compatibility
 #if NET6_0_OR_GREATER
         public static bool IsWindows() => OperatingSystem.IsWindows();
         public static bool IsMacOS() => OperatingSystem.IsMacOS();
+        public static bool IsMacCatalyst() => OperatingSystem.IsMacCatalyst();
         public static bool IsLinux() => OperatingSystem.IsLinux();
+        public static bool IsFreeBSD() => OperatingSystem.IsFreeBSD();
         public static bool IsAndroid() => OperatingSystem.IsAndroid();
         public static bool IsIOS() => OperatingSystem.IsIOS();
         public static bool IsTvOS() => OperatingSystem.IsTvOS();
@@ -18,10 +20,12 @@ namespace Avalonia.Compatibility
         public static bool IsWindows() => RuntimeInformation.IsOSPlatform(OSPlatform.Windows);
         public static bool IsMacOS() => RuntimeInformation.IsOSPlatform(OSPlatform.OSX);
         public static bool IsLinux() => RuntimeInformation.IsOSPlatform(OSPlatform.Linux);
-        public static bool IsAndroid() => IsOSPlatform("ANDROID");
-        public static bool IsIOS() => IsOSPlatform("IOS");
-        public static bool IsTvOS() => IsOSPlatform("TVOS"); // untested
-        public static bool IsBrowser() => IsOSPlatform("BROWSER");
+        public static bool IsFreeBSD() => false;
+        public static bool IsAndroid() => false;
+        public static bool IsIOS() => false;
+        public static bool IsMacCatalyst() => false;
+        public static bool IsTvOS() => false;
+        public static bool IsBrowser() => false;
         public static bool IsOSPlatform(string platform) => RuntimeInformation.IsOSPlatform(OSPlatform.Create(platform));
 #endif
     }

src/Avalonia.Base/Platform/StandardRuntimePlatform.cs

@@ -1,20 +1,18 @@
-using System;
-using System.Threading;
 using Avalonia.Compatibility;
 using Avalonia.Metadata;
-using Avalonia.Platform.Internal;
 
 namespace Avalonia.Platform
 {
     [PrivateApi]
     public class StandardRuntimePlatform : IRuntimePlatform
     {
-        private static readonly RuntimePlatformInfo s_info = new()
+        public virtual RuntimePlatformInfo GetRuntimeInfo() => new()
         {
-            IsDesktop = OperatingSystemEx.IsWindows() || OperatingSystemEx.IsMacOS() || OperatingSystemEx.IsLinux(),
-            IsMobile = OperatingSystemEx.IsAndroid() || OperatingSystemEx.IsIOS()
+            IsDesktop = OperatingSystemEx.IsWindows()
+                        || OperatingSystemEx.IsMacOS() || OperatingSystemEx.IsMacCatalyst()
+                        || OperatingSystemEx.IsLinux() || OperatingSystemEx.IsFreeBSD(),
+            IsMobile = OperatingSystemEx.IsAndroid() || (OperatingSystemEx.IsIOS() && !OperatingSystemEx.IsMacCatalyst()),
+            IsTV = OperatingSystemEx.IsTvOS()
         };
-        
-        public virtual RuntimePlatformInfo GetRuntimeInfo() => s_info;
     }
 }