I have an iOS Application which will load a particular view controller for authentication. However no matter what, the view controller will not load. Below is the code for my method which handles this (This is for a Game Center authentication popup):
-(void)authenticateLocalUser {
GKLocalPlayer *localPlayer = [GKLocalPlayer localPlayer];
localPlayer.authenticateHandler = ^(UIViewController *viewController, NSError *error) {
if (viewController != nil) {
NSLog(#"AUTH VIEW CONTROLLER");
[[[UIApplication sharedApplication] keyWindow].rootViewController presentViewController:viewController animated:YES completion:nil];
}
else if (localPlayer.isAuthenticated) {
NSLog(#"User is authenticated");
}
else {
NSLog(#"Game Center Auth error.");
}
};
}
As you can see, I have followed the official Apple developer documentation. However the output of this method is always:
Game Center Auth Error (Last NSLog).
Why doesn't the view controller ever load? Because I need it to load so that the user can login to Game Center if they haven't done so already.
Thanks for your time, Dan.
It turned out that the issue in the end was to do with the Game Center app itself. I just logged in/out of that and it all worked. I have also now seen this same issue replicated in other iOS apps too which use Game Center.
Related
My iOS game is using Game Center.
I am authenticating via the following code:
GKLocalPlayer* localPlayer = [GKLocalPlayer localPlayer];
localPlayer.authenticateHandler = ^(UIViewController* viewController, NSError* error) {
if (viewController != nil) { [self.window.rootViewController presentViewController:viewController animated:YES completion:nil]; }
else {
if ([GKLocalPlayer localPlayer].authenticated) {
// code for Game Center enabled
[[GKLocalPlayer localPlayer] loadDefaultLeaderboardIdentifierWithCompletionHandler:getLeaderboardIdentifier]; }
else {
// code for Game Center disabled
}
} // viewController was nil
}; // localPlayer.authenticateHandler
It all works well, but when the game has been in the background for some time and gets restarted, the annoying "welcome back banner" is displayed even though I am not calling the previous code as I have checked that ([GKLocalPlayer localPlayer].authenticated == YES)...
Is there a way to know if this banner is going to appear that I could use in applicationWillEnterForeground?
At worse, is there a known background delay that triggers it?
In this case I would slightly delay resuming into the game for a better UX...
As there does not seem to be a way to know in advance for sure if the "Welcome Back" banner is going to be displayed when localPlayer is already authenticated, I will for now stick with the background delay trick.
I have done a dichotomic test by playing the game, leaving the App in the background and returning to the App after delay D.
It seems that the "Welcome Back" banner does not appear if D < 8 minutes and does if D is greater. If that may help others in improving their user experience...
In my case, if D >= 8 minutes when applicationWillEnterForeground, I disable the resume game button for 2.5 seconds. Most of the time, the "Welcome Back" banner appears during that lapse and doesn't bother the user while a tough game is restarting.
I am trying to integrate Game Centre to my Sprite Kit game. I am referring to this link:
http://www.appcoda.com/ios-game-kit-framework/
I have created a record on my iTunes Connect account for the game I am building. I try connecting to the Game Centre in the Simulator by trying to login through the Game Centre App itself and it gives me this error:
Could not Connect to the Game Center Server
And if I try to login through settings > Game Center, I get an error saying:
Unable to connect to server,
The network connection was lost
When I open my game, I have code written which checks if there is an authenticated user or not, and if not, it shows up the login to game centre scene. It showed this a couple of times but I canceled it because I kept getting the first error. Now that screen doesn't even show up.
What am I doing wrong?
PS: I have Game Centre enabled in my game in the capabilities menu.
EDIT:
This is in my viewController.m:
-(void)authenticateLocalPlayer {
GKLocalPlayer *localPlayer = [GKLocalPlayer localPlayer];
localPlayer.authenticateHandler = ^(UIViewController *viewController, NSError *error){
if (viewController != nil) {
[self presentViewController:viewController animated:YES completion:nil];
}
else{
if ([GKLocalPlayer localPlayer].authenticated) {
gameCenterEnabled = YES;
// Get the default leaderboard identifier.
[[GKLocalPlayer localPlayer] loadDefaultLeaderboardIdentifierWithCompletionHandler:^(NSString *leaderboardIdentifier, NSError *error) {
if (error != nil) {
NSLog(#"%#", [error localizedDescription]);
}
else{
leaderboardIdentifier = leaderboardIdentifier;
}
}];
}
else{
gameCenterEnabled = NO;
}
}
};
}
I call it in the viewDidLoad of my viewController.m
Issue might be with your device and not your code. Try these steps:
Press and hold the Sleep/Wake button and the Home button together for at least ten seconds, until the Apple logo appears.
If that doesn't help, tap Settings -> General -> Reset -> Reset Network Settings.
You will have to re-enter your WiFi password.
Also confirm your device Apple ID matches your developer ID.
I have a simple iOS app which makes use of Game Center. However recently when updating it to iOS 7, I noticed that the authenticate method does not work.
One of the issues is with the code I am using to present the view controller to the user if they need to sign in to game centre, it no longer pops up the game centre login window in the app.
Another issue I have is that I can't find what method to use instead of the deprecated "authenticateWithCompletionHandler".
Here is my code:
-(void)authenticateLocalUser {
GKLocalPlayer.localPlayer.authenticateHandler = ^(UIViewController *viewController, NSError *error) {
if (GKLocalPlayer.localPlayer.authenticated) {
// Already authenticated
}
else if (viewController) {
[self presentViewController:viewController animated:YES completion:nil];
}
else {
// Problem with authentication, probably bc the user doesn't use Game Center.
}
};
if ([GKLocalPlayer localPlayer].authenticated == NO) {
[[GKLocalPlayer localPlayer] authenticateWithCompletionHandler:^(NSError *error) {
[self callDelegateOnMainThread: #selector(processGameCenterAuth:) withArg:NULL error: error];
}];
}
}
Thanks for your time, Dan.
No matter I managed to figure it out in the end. As for 'authenticateWithCompletionHandler', I used this:
[[[UIApplication sharedApplication] keyWindow].rootViewController presentViewController:viewController animated:YES completion:nil];
I have an app that uses GameCenter in a very simple way (just a simple leaderboard with an all time high score). Sometimes when I switch to my app I'll see the notification saying "welcome back to Game Center" but sometimes this notification appears squished like in the following image:
http://i.imgur.com/KOCFIJo.jpg
Does anybody know what might the causing this? Because I have absolutely no idea.
My authentication code which generates the notification banner is fairly standard.
GKLocalPlayer *localPlayer = [GKLocalPlayer localPlayer];
[GKLocalPlayer localPlayer].authenticateHandler = ^(UIViewController *viewController, NSError *error) {
// If there is an error, do not assume local player is not authenticated.
if (localPlayer.isAuthenticated) {
// Enable Game Center Functionality
self.gameCenterAuthenticationComplete = YES;
[self enableGameCenter:YES];
gameCenterButton.enabled=true;
} else {
NSLog(#"game center not logged in");
// User has logged out of Game Center or can not login to Game Center, your app should run
// without GameCenter support or user interface.
self.gameCenterAuthenticationComplete = NO;
[self enableGameCenter:NO];
[self presentViewController:viewController animated:true completion:nil ];
gameCenterButton.enabled=false;
}
};
One additional piece of information is that my app is in portrait orientation when this problem occurs. It seems like if I rotate my phone 90 degrees while the banner is showing, it will look normally in landscape but in portrait it looks all squished. Does this help explain it?
I figured it out. I hadn't implemented preferredInterfaceOrientationForPresentation so I did that
- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
return UIInterfaceOrientationPortrait;
}
And also I made sure that supportedInterfaceOrientations returend UIInterfaceOrientationMaskPortrait (note that it returns UIInterfaceOrientationMASKPortrait not just UIInterfaceOrientationPortrait). After that everything worked fine.
- (NSUInteger)supportedInterfaceOrientations
{
return UIInterfaceOrientationMaskPortrait;
}
I call Chartboost interstitial at applicationDidBecomeActive. My game use s Game Center and sometimes GC authorization window pops up under Chartboost interstitial, blocking Chartboost window. Only solution is switch to GameCenter and login there. Is it possible to check what authorization window was shown?
Blocking ads when Game Center login is on screen might be an option! Code works only on iOS6 btw
#interface ChartboostBridge : NSObject<ChartboostDelegate>
#end
#implementation ChartboostBridge
- (BOOL)shouldDisplayInterstitial:(NSString *)location{
NSLog(#"CB shouldDisplayInterstitial for %#",location);
if ([location isEqualToString:#"game_launch"]) {
if( [[GameCenterIos shared ] hasLogInView] ){
return NO;
}
}
return YES;
}
#end
#implementation GameCenterIos
- (BOOL)hasLogInView{
return isViewOnScreen;
}
- (void)login
{
GKLocalPlayer* localPlayer = [GKLocalPlayer localPlayer];
if (localPlayer.isAuthenticated) {
isViewOnScreen=NO;
return;
}
localPlayer.authenticateHandler =
^(UIViewController *viewController,
NSError *error) {
if (localPlayer.authenticated) {
isAuthenticated = YES;
isViewOnScreen=NO;
} else if(viewController) {
NSLog(#"Game Center shows login ....");
isViewOnScreen=YES;
[self presentViewController:viewController];
} else {
NSLog(#"Game Center error or canceled login ....");
//User canceled Login view
isAuthenticated = NO;
isViewOnScreen=NO;
}
};
}
#pragma mark UIViewController stuff
-(UIViewController*) getRootViewController {
return [UIApplication
sharedApplication].keyWindow.rootViewController;
}
-(void)presentViewController:(UIViewController*)vc {
UIViewController* rootVC = [self getRootViewController];
[rootVC presentViewController:vc animated:YES
completion:nil];
}
#end
This is and old question but I just had the same problem and found a workaround.
Change the modalPresentationStyle of the gamecenter loggin view (returned by the ios 6 authentication handler) to UIModalPresentationFullScreen.
On iphone the screen doesn't lock when gamecenter loggin and chartboost interstitial appear. Only on Ipad happens. And whats the difference? that in ipad the loggin is not fullscreen. So I tested changing it to fullscreen and now it works without locking =)