Create apps that allow players to interact with each other using GameKit.

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Problem with GKAccessPoint on visionOS
I started adding GameCenter support for my visionOS game and I noticed an issue. After authenticating the player the access point shows in the location I specified but my window content gets an overlay and game cannot be used. Anybody has experience with GameCenter on visionOS and how to properly set it up and use the GKAccessPoint? Thank you! Adding a screenshot:
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500
Apr ’24
New Game Center Sign In Screen: How to know when it is presented, covering my app?
Recently (I'm not sure exactly when), the "Sign in to Game Center" banner started appearing at the top of my app when the app sets the GC authentication handler and there is no Game Center player currently signed in on the device: So far so good. But if the banner is tapped, a full "Sign In to Game Center" modal view automatically appears and covers the app without notification: This is not the sign-in view controller that the GC authentication handler normally passes when a player is not signed in, which previously gave my app control over when to present it. My app is unaware that it is covered by this new sign-in screen. Is there any way for my app to know when the user taps the "Sign In" banner and causes this new automatic sign-in screen to appear? I need to pause my game while it is covered up. In general, is there a way for my view controller to be notified when it has been covered by a modal view controller that's outside my app's control?
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581
Mar ’24
I delete Gaming Port Kit and want to redownload it again, than it happened.
I've installed the GPTK before, but it pops up with some problems so I want to reinstall it again. So I deleted home brew and redownload all the materials I needed. But when it comes to install the game-porting-toolkit formula, I can't download it, did anyone have the same problem with me? jimmy@Jimmymbp14 ~ % brew -v install apple/apple/game-porting-toolkit Error: Formulae found in multiple taps: * apple/apple/game-porting-toolkit-compiler * gcenx/apple/game-porting-toolkit-compiler Please use the fully-qualified name (e.g. apple/apple/game-porting-toolkit-compiler) to refer to a specific formula. jimmy@Jimmymbp14 ~ %
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809
Mar ’24
USB HID Specifics for Mac OS?
I am currently developing an USB HID Device, specifically a type of Joystick. However it seems that any attempt of getting a joystick to work on Mac do not work. My prototype works perfectly on Windows, being recognised as such and receiving all data. On MacOS, the Joystick is not recognised as a Joystick though, and the OS does not seem to receiver any Input from it whatsoever. I have translated my code to use both Mouse and Keyboard, both work perfectly. I have also tried to have the Joystick identify as a Gamepad, but again, it works on Windows and is not recognised on Mac (is not recognised as a Gamepad). Are there any specific restrictions to HID devices on MacOS? Apple developer only seems to describe specifics from a software standpoint, not from the standpoint of someone developing hardware. And even then it only seems to describe very specific HID devices, such as mouse, keyboard or a stylus. Please also keep in mind that I don't have much experience developing MacOS applications.
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1.3k
Mar ’24
GKLocalPlayer.local.isMultiplayerGamingRestricted not representing all relevant scenarios?
I need clarification on the GKLocalPlayer.local.isMultiplayerGamingRestricted behavior which check's user's device capability (whether it is set up to allow or disallow multiplayer) I am referring to this from Apple documentation at : https://developer.apple.com/documentation/gamekit/authenticating_a_player if GKLocalPlayer.local.isMultiplayerGamingRestricted { // Disable multiplayer game features. } The issue is that this is a boolean (true/false value ) However I have noticed that iOS ( latest version and preceding versions) allow people to have the following options: ( you can set these under screen time -> content restrictions -> Multiplayer games ) Disallow all multiplayer games - presumably your API returns a false for this. Allow multiplayer with friends only -???? what does GKLocalPlayer.local.isMultiplayerGamingRestricted return here?? if True, how is the Friends only restriction handled? Are we supposed to do something to force it? Note: So far I am relying on Apple's Game Center native experience and have not added wrappers to do additional filtering etc. I hope that I shall be able to keep doing so. Allow all multiplayer games - presumably your API returns a false for this. You can see how there are three choices but this is modeled as a boolean. Choice number 2. is not addressed. Has anyone come across this? Note: This is very different from checking for underage users. No matter what I do, in my post above, it won't set the correct numbers for numbered bullet -points. I call them 1, 2, 3 it posts 1,1,2 or 1.,2,1 etc. ( side nit ) Apologies if this isn't as readable as it should be.
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1.4k
Mar ’24
NSMutableDictionary removeAllObjects does not free up used memory!
I have a custom Objective-C ObjectCache class that utilized NSMutableDictionary to store named objects (specifically large NSImage objects). The class has a maxItems property and clear method, which worked fine. - (void)clear { @synchronized(_cache) { [_cache removeAllObjects]; } } But yesterday I received a customer feedback complaining one of my app consumes up to 24GB memory. I verified that on my M1 Mac mini, and it's true. Even after calling clear method, memory usage shown in both Xcode debugger panel and Activity Monitor remains the same. It did work before. Once I close a picture gallery window by calling clear method, memory usage dropped immediately as shown in Activity Monitor. I suspect that this is a bug in ARM architecture. Does anyone else have same problem?
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684
Mar ’24
iOS 17 Crash
We are noticing below iOS crash majorly happening from iOS 17 version. Can someone please check and let me know what might be causing this crash and how to solve this? Attached full crash report from app store. Last Exception Backtrace: 0 CoreFoundation 0x1b5cce69c __exceptionPreprocess + 164 (NSException.m:249) 1 libobjc.A.dylib 0x1adf67c80 objc_exception_throw + 60 (objc-exception.mm:356) 2 UIKitCore 0x1b8592ab4 -[UIViewController _presentViewController:withAnimationController:completion:] + 4236 (UIViewController.m:0) 3 UIKitCore 0x1b859312c __63-[UIViewController _presentViewController:animated:completion:]_block_invoke + 92 (UIViewController.m:9730) 4 UIKitCore 0x1b7f36fac -[_UIViewControllerTransitionCoordinator _applyBlocks:releaseBlocks:] + 128 (UIViewControllerTransitioning.m:1205) 5 UIKitCore 0x1b7f36ab4 -[_UIViewControllerTransitionContext _runAlongsideCompletions] + 140 (UIViewControllerTransitioning.m:393) 6 UIKitCore 0x1b7f36144 -[_UIViewControllerTransitionContext completeTransition:] + 128 (UIViewControllerTransitioning.m:307) 7 UIKitCore 0x1b80a9460 -[UITransitionView notifyDidCompleteTransition:] + 180 (UITransitionView.m:280) 8 UIKitCore 0x1b80a9118 -[UITransitionView _didCompleteTransition:] + 832 (UITransitionView.m:249) 9 UIKitCore 0x1b7e91d78 UIVIEW_IS_EXECUTING_ANIMATION_COMPLETION_BLOCK + 36 (UIView.m:16376) 10 UIKitCore 0x1b7e91510 -[UIViewAnimationBlockDelegate _didEndBlockAnimation:finished:context:] + 624 (UIView.m:16409) 11 UIKitCore 0x1b7e90b88 -[UIViewAnimationState sendDelegateAnimationDidStop:finished:] + 436 (UIView.m:0) 12 UIKitCore 0x1b7e72d84 -[UIViewAnimationState animationDidStop:finished:] + 196 (UIView.m:2407) 13 UIKitCore 0x1b7e72e98 -[UIViewAnimationState animationDidStop:finished:] + 472 (UIView.m:2426) 14 QuartzCore 0x1b725f980 run_animation_callbacks(void*) + 132 (CALayer.mm:7713) 15 libdispatch.dylib 0x1bdbd9300 _dispatch_client_callout + 20 (object.m:561) 16 libdispatch.dylib 0x1bdbe7998 _dispatch_main_queue_drain + 984 (queue.c:7813) 17 libdispatch.dylib 0x1bdbe75b0 _dispatch_main_queue_callback_4CF + 44 (queue.c:7973) 18 CoreFoundation 0x1b5c1901c CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE + 16 (CFRunLoop.c:1780) 19 CoreFoundation 0x1b5c15d28 __CFRunLoopRun + 1996 (CFRunLoop.c:3149) 20 CoreFoundation 0x1b5c15478 CFRunLoopRunSpecific + 608 (CFRunLoop.c:3420) 21 GraphicsServices 0x1f91964f8 GSEventRunModal + 164 (GSEvent.c:2196) 22 UIKitCore 0x1b803962c -[UIApplication _run] + 888 (UIApplication.m:3685) 23 UIKitCore 0x1b8038c68 UIApplicationMain + 340 (UIApplication.m:5270) 24 UnityFramework 0x11151c310 -[UnityFramework runUIApplicationMainWithArgc:argv:] + 92 (main.mm:124) 25 myapp 0x10497c17c main + 60 (main.mm:26) 26 dyld 0x1d894edcc start + 2240 (dyldMain.cpp:1269) Kernel Triage: VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter VM - (arg = 0x3) mach_vm_allocate_kernel failed within call to vm_map_enter Thread 0 name: Thread 0 Crashed: 0 libsystem_kernel.dylib 0x00000001fd349fbc __pthread_kill + 8 (:-1) 1 libsystem_pthread.dylib 0x000000021fc0b680 pthread_kill + 268 (pthread.c:1681) 2 libsystem_c.dylib 0x00000001bdc91c24 __abort + 136 (abort.c:159) 3 libsystem_c.dylib 0x00000001bdc91b9c abort + 192 (abort.c:126) 4 libc++abi.dylib 0x000000021fb35ff8 abort_message + 132 (abort_message.cpp:78) 5 libc++abi.dylib 0x000000021fb25f90 demangling_terminate_handler() + 348 (cxa_default_handlers.cpp:77) 6 libobjc.A.dylib 0x00000001adf6ada4 _objc_terminate() + 144 (objc-exception.mm:496) 7 UnityFramework 0x000000011358d254 CPPExceptionTerminate() + 332 (BSG_KSCrashSentry_CPPException.mm:137) 8 libc++abi.dylib 0x000000021fb353bc std::__terminate(void (*)()) + 16 (cxa_handlers.cpp:59) 9 libc++abi.dylib 0x000000021fb35360 std::terminate() + 108 (cxa_handlers.cpp:88) 10 libdispatch.dylib 0x00000001bdbd9314 _dispatch_client_callout + 40 (object.m:564) 11 libdispatch.dylib 0x00000001bdbe7998 _dispatch_main_queue_drain + 984 (queue.c:7813) 12 libdispatch.dylib 0x00000001bdbe75b0 _dispatch_main_queue_callback_4CF + 44 (queue.c:7973) 13 CoreFoundation 0x00000001b5c1901c CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE + 16 (CFRunLoop.c:1780) 14 CoreFoundation 0x00000001b5c15d28 __CFRunLoopRun + 1996 (CFRunLoop.c:3149) 15 CoreFoundation 0x00000001b5c15478 CFRunLoopRunSpecific + 608 (CFRunLoop.c:3420) 16 GraphicsServices 0x00000001f91964f8 GSEventRunModal + 164 (GSEvent.c:2196) 17 UIKitCore 0x00000001b803962c -[UIApplication _run] + 888 (UIApplication.m:3685) 18 UIKitCore 0x00000001b8038c68 UIApplicationMain + 340 (UIApplication.m:5270) 19 UnityFramework 0x000000011151c310 -[UnityFramework runUIApplicationMainWithArgc:argv:] + 92 (main.mm:124) 20 myapp 0x000000010497c17c main + 60 (main.mm:26) 21 dyld 0x00000001d894edcc start + 2240 (dyldMain.cpp:1269) NSInvalidArgumentException.txt
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1k
Feb ’24
[iOS 17] GKAppLevelSignInVisibility fetchAppLevelVisibilityConstraintsWithHandler crash
We noticing below crash mainly happening in iOS 17. Can someone check and confirm what is the root cause for this and how to fix the crash. GKAppLevelSignInVisibility fetchAppLevelVisibilityConstraintsWithHandler Thread 36 Crashed: 0 CoreFoundation 0x00000001904a9d6c -[__NSDictionaryM setObject:forKeyedSubscript:] + 452 (NSDictionaryM.m:202) 1 GameCenterUICore 0x000000020fe6d508 __76+[GKAppLevelSignInVisibility fetchAppLevelVisibilityConstraintsWithHandler:]_block_invoke_3 + 84 (GKAppLevelSignInVisibility.m:82) 2 GameCenterFoundation 0x00000001c8b8971c @objc closure #1 in LimitedPresentationManager.presentationDisabled(config:context:) + 268 3 GameCenterFoundation 0x00000001c8b8b111 partial apply for @objc closure #1 in LimitedPresentationManager.presentationDisabled(config:context:) + 1 4 GameCenterFoundation 0x00000001c8b8b101 thunk for @escaping @callee_guaranteed @Sendable @async () -> () + 1 5 GameCenterFoundation 0x00000001c8b8b105 partial apply for thunk for @escaping @callee_guaranteed @Sendable @async () -> () + 1 6 GameCenterFoundation 0x00000001c8b8aa0d specialized thunk for @escaping @callee_guaranteed @Sendable @async () -> (@out A) + 1 (:0) 7 GameCenterFoundation 0x00000001c8b8ab6d partial apply for specialized thunk for @escaping @callee_guaranteed @Sendable @async () -> (@out A) + 1 (:0) 8 libswift_Concurrency.dylib 0x000000019b78da41 completeTaskWithClosure(swift::AsyncContext*, swift::SwiftError*) + 1 (Task.cpp:463) Full iOS crash log
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911
Feb ’24
Using video chat instead of voice chat on online game ?
Hello, I am building an app that requires players joined to an online game session and to have a video chat with both of their front cameras turned on. I currently know that GameKit supports the voice chat option but could not find any source for video chat. Is it possible set up a video chat on an online game session?. What libraries can I use that have support in implementing the video chat (AVFoundation) ? Your assistance is greatly appreciated.
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898
Feb ’24
Game Center authenticateHandler on visionOS
GKLocalPlayer.local.authenticateHandler = {viewController, error in When authenticating a player using authenticateHandler, the completion handler is only called if the player is already logged in. If the player is not logged in, the authentication window will appear but the completion handler is never called. If I have content in a volumetric window that obscures the login window (which appears at a slight Z increase from the parent window), what can I do? If the completion handler was being called then I could make adjustments to my view, but it never gets called if the user is not already logged in. https://developer.apple.com/documentation/gamekit/authenticating_a_player Thanks.
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563
Jun ’24
AGPT not working properly.
I am on a MacBook Pro 2023. 16inch, 16gb ram, 1tb drive. I am on the latest MacOs (Sonoma 14.3.1) and using the steps from the Apple Gaming Wiki to download the Game Porting Toolkit. I have met all the requirements. I tried using the automated installer, didn't work. I tried doing homebrew, and it worked all up until I got to the step where I had to run the command to download Apple tap: brew tap apple/apple http://github.com/apple/homebrew-apple I get this error: Logs: /Users/MYNAME/Library/Logs/Homebrew/game-porting-toolkit/00.options.out /Users/MYNAME/Library/Logs/Homebrew/game-porting-toolkit/01.configure /Users/MYNAME/Library/Logs/Homebrew/game-porting-toolkit/01.configure.cc /Users/MYNAME/Library/Logs/Homebrew/game-porting-toolkit/02.make /Users/MYNAME/Library/Logs/Homebrew/game-porting-toolkit/wine64-build If reporting this issue please do so to (not Homebrew/brew or Homebrew/homebrew-core): apple/apple
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726
Feb ’24
Game Center Achievements with 1,000 Units
I'm putting together a group of achievements on Game Center for my new game. From what I read, you must just adjust the "Percent Complete" when reporting updates on an achievement. However, you can only use whole numbers when doing that. So, how would one update a single "unit" to an achievement that needs 1,000 units to achieve? Any suggestions would be very helpful. Thanks!
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519
Feb ’24
Game Porting Toolkit Error
I tried twice to install homebrew and I got a error message twice: Error: apple/apple/game-porting-toolkit 1.1 did not build Logs: /Users/omarzunun/Library/Logs/Homebrew/game-porting-toolkit/00.options.out /Users/omarzunun/Library/Logs/Homebrew/game-porting-toolkit/01.configure /Users/omarzunun/Library/Logs/Homebrew/game-porting-toolkit/01.configure.cc /Users/omarzunun/Library/Logs/Homebrew/game-porting-toolkit/02.make /Users/omarzunun/Library/Logs/Homebrew/game-porting-toolkit/wine64-build If reporting this issue please do so to (not Homebrew/brew or Homebrew/homebrew-core): apple/apple
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1.9k
Jan ’24
Matchmaker connecting issues on Mobile network
I'm trying to establish a connection between two devices using mobile network. The config in both devices are ok allowing use mobile data for the app. I'm able to connect and start the game with WIFI networ `// Initiate matchmaking - (void)initiateMatchmakingWithViewController:(UIViewController*)rustViewController { dispatch_async(dispatch_get_main_queue(), ^{ if (![GKLocalPlayer localPlayer].isAuthenticated) { NSLog(@"Player is not authenticated."); return; } NSLog(@"Preparing MatchMaker"); GKMatchRequest *request = [[GKMatchRequest alloc] init]; request.minPlayers = 2; request.maxPlayers = 2; GKMatchmakerViewController *mmvc = [[GKMatchmakerViewController alloc] initWithMatchRequest:request]; mmvc.matchmakerDelegate = self; // Use the passed view controller to present the matchmaking UI [rustViewController presentViewController:mmvc animated:YES completion:nil]; NSLog(@"MatchMaker running...."); // Store the rustViewController for later, to revert back to it originalViewController = rustViewController; }); } // GKMatchmakerViewControllerDelegate methods - (void)matchmakerViewControllerWasCancelled:(GKMatchmakerViewController *)viewController { [originalViewController dismissViewControllerAnimated:YES completion:nil]; NSLog(@"Matchmaking was cancelled."); } - (void)matchmakerViewController:(GKMatchmakerViewController *)viewController didFailWithError:(NSError *)error { [originalViewController dismissViewControllerAnimated:YES completion:nil]; NSLog(@"Matchmaking failed with error: %@", error.localizedDescription); } - (void)matchmakerViewController:(GKMatchmakerViewController *)viewController didFindMatch:(GKMatch *)match { [originalViewController dismissViewControllerAnimated:YES completion:nil]; self.currentMatch = match; match.delegate = self; NSLog(@"Match found."); // Fetch details for each player in the match NSMutableArray<NSString *> *playerIDs = [NSMutableArray array]; for (GKPlayer *player in match.players) { [playerIDs addObject:player.playerID]; } [GKPlayer loadPlayersForIdentifiers:playerIDs withCompletionHandler:^(NSArray<GKPlayer *> *players, NSError *error) { if (error) { NSLog(@"Error retrieving player details: %@", error.localizedDescription); return; } for (GKPlayer *player in players) { if (![player.playerID isEqualToString:GKLocalPlayer.localPlayer.playerID]) { [self loadAndStoreAvatarForRemotePlayer:player]; } } }]; }` I can see how both clients are in state "connecting" but the log "Match found." it's never set. I also can see this log "[Match] syncPlayers failed to loadPlayersForLegacyIdentifiers"
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476
Jan ’24
GKTurnBasedMatchmakerViewController showExistingMatches not always showing
In a SwiftUI game using a UIViewControllerRepresentable; When presenting a GKTurnBasedMatchmakerViewController view with showExistingMatches set to true, sometimes the Invite view is presented and not the existing matches, dismissing it or even inviting someone does not stop it from presenting the next time it's called. Sometimes logging out and of Game Center and back in fixes it other times a restart of the device is required. typealias ViewControllerRepresentable = UIViewControllerRepresentable struct GameCenterView: ViewControllerRepresentable { ... // Creates a new view controller func makeUIViewController(context: Context) -> GKTurnBasedMatchmakerViewController { let request = GKMatchRequest() request.minPlayers = 2 request.maxPlayers = 2 request.inviteMessage = "Would you like to play a game of X?" request.defaultNumberOfPlayers = 2 let viewController = GKTurnBasedMatchmakerViewController(matchRequest: request) viewController.showExistingMatches = true viewController.turnBasedMatchmakerDelegate = context.coordinator return viewController } ...
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430
Jan ’24
Game Center MatchMaker only work on WIFI
I'm working in a game where I integrate matchmaker and it's working fine when I try with two devices under same wifi network, but in the moment I use 5g mobile network and I do the matchmaker, I can still see each other but the game did not start and I see error sending data to the remote player. The game is not yet published and I'm using TestFlight for the clients.
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599
Jan ’24