AppKit Consistency error: you are calling a method that can only be invoked from the UI thread.

1

I’m trying to run my game on Mac using Xamarin studio. The game compiles fine but then I get the error “AppKit Consistency error: you are calling a method that can only be invoked from the UI thread.”

Has anyone else seen this error?

1 Like
2

Where is this error occurring? There are things which can only be executed on the primary (UI) thread.

3

The crash happens in Game1 which is the Game class for my project. Here’s the callstack.

HackPuzzle.Game1..ctor () in /Users/barryhemans/Projects/HackPuzzleMacOSX/HackPuzzleMacOSX/Game1.cs:42
HackPuzzle.AppDelegate.FinishedLaunching (notification={NSConcreteNotification 0x774ae60 {name = NSApplicationDidFinishLaunchingNotification; object = <NSApplication: 0x7b4bc50>; userInfo = {
    NSApplicationLaunchIsDefaultLaunchKey = 1;
}}}) in /Users/barryhemans/Projects/HackPuzzleMacOSX/HackPuzzleMacOSX/Main.cs:34
MonoMac.AppKit.NSApplication.NSApplicationMain () in 
MonoMac.AppKit.NSApplication.Main (args={string[0]}) in /Users/builder/data/lanes/1977/6db87c53/source/maccore/src/AppKit/NSApplication.cs:94
HackPuzzle.Program.Main (args={string[0]}) in /Users/barryhemans/Projects/HackPuzzleMacOSX/HackPuzzleMacOSX/Main.cs:21

How do I set what thread the game is run on?

4

Can you show us the code in your Game constructor? What AppKit API are you calling that it is complaining about?

5

The Game1 constructor is

    public Game1()  
    {

		graphics = new GraphicsDeviceManager(this);
		
		Content.RootDirectory = "Content";
		//LeaderBoard.Load ();
		Settings.Load ();

		graphics.PreferredBackBufferHeight = (int)(768 * 1.0f );
		graphics.PreferredBackBufferWidth = (int)(1366 * 1.0f);
		GlobalData.Instance().sizeRatio = graphics.PreferredBackBufferHeight / 768.0f;

		screenManager = new ScreenManager(this);
		LoadingScreen.Load(screenManager, false, null, new MainMenuBackground(), new ControlSelection(NextScreen.MainMenu));

		IsMouseVisible = true;
		graphics.IsFullScreen = true;
	}

I’m not sure what AppKit API I’m calling that is causing the problem. My Main.cs looks like this

using System;
using System.Collections.Generic;
using System.Linq;
using MonoMac.AppKit;
using MonoMac.Foundation;

namespace HackPuzzle
{
	static class Program
	{
		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		static void Main (string[] args)
		{
			NSApplication.Init ();
			NSApplication.CheckForIllegalCrossThreadCalls = false;
			
			using (var p = new NSAutoreleasePool ()) {
				NSApplication.SharedApplication.Delegate = new AppDelegate ();
				NSApplication.Main (args);
			}


		}
	}

	class AppDelegate : NSApplicationDelegate
	{
		Game1 game;

		public override void FinishedLaunching (MonoMac.Foundation.NSObject notification)
		{
			game = new Game1 ();
			game.Run ();
		}

		public override bool ApplicationShouldTerminateAfterLastWindowClosed (NSApplication sender)
		{
			return true;
		}
	}
}