Fixes #1405

src/OSX/Avalonia.MonoMac/ClipboardImpl.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.Threading.Tasks;
+using Avalonia.Input.Platform;
+using MonoMac.AppKit;
+
+namespace Avalonia.MonoMac
+{
+    class ClipboardImpl : IClipboard
+    {
+        public Task<string> GetTextAsync()
+        {
+            return Task.FromResult(NSPasteboard.GeneralPasteboard.GetStringForType(NSPasteboard.NSStringType));
+        }
+
+        public Task SetTextAsync(string text)
+        {
+            NSPasteboard.GeneralPasteboard.ClearContents();
+            if (text != null)
+                NSPasteboard.GeneralPasteboard.SetStringForType(text, NSPasteboard.NSStringType);
+            return Task.CompletedTask;
+        }
+
+        public async Task ClearAsync()
+        {
+            NSPasteboard.GeneralPasteboard.ClearContents();
+        }
+    }
+}
+

src/OSX/Avalonia.MonoMac/MonoMacPlatform.cs

@@ -3,6 +3,7 @@ using System.Threading;
 using Avalonia.Controls;
 using Avalonia.Controls.Platform;
 using Avalonia.Input;
+using Avalonia.Input.Platform;
 using Avalonia.Platform;
 using Avalonia.Rendering;
 using MonoMac.AppKit;
@@ -32,6 +33,7 @@ namespace Avalonia.MonoMac
                 .Bind<IPlatformSettings>().ToConstant(this)
                 .Bind<IWindowingPlatform>().ToConstant(this)
                 .Bind<ISystemDialogImpl>().ToSingleton<SystemDialogsImpl>()
+                .Bind<IClipboard>().ToSingleton<ClipboardImpl>()
                 .Bind<IRenderLoop>().ToConstant(s_renderLoop)
                 .Bind<IPlatformThreadingInterface>().ToConstant(PlatformThreadingInterface.Instance);
         }