SpriteKit - Can't sign in to Gamecenter - swift

Question

I did everything right regarding itunes connect, but when I start the app it doesn't authenticate, and when I press my Gamecenter button it gives me a message "Gamecenter is not available, user not signed in"
Code:
ViewController:
import UIKit
import SpriteKit
import GameKit
class GameViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
authenticateLocalPlayer()
}
//initiate gamecenter
func authenticateLocalPlayer(){
print("Starting..1")
let localPlayer = GKLocalPlayer.localPlayer()
print("Starting..2")
localPlayer.authenticateHandler = {(viewController, error) -> Void in
print("Starting..3")
if (viewController != nil) {
print("Not signed in. Authenticating now")
var vc = self.view?.window?.rootViewController
vc?.presentViewController(viewController!, animated: true, completion: nil)
}
else {
print((GKLocalPlayer.localPlayer().authenticated))
}
}
}
GameScene:
import SpriteKit
import iAd
import GameKit
class GameScene: SKScene, SKPhysicsContactDelegate, ADBannerViewDelegate, GKGameCenterControllerDelegate {
func saveHighscore(score:Int) {
//check if user is signed in
if GKLocalPlayer.localPlayer().authenticated {
let scoreReporter = GKScore(leaderboardIdentifier: "CC_Leaderboard_1") //leaderboard id here
scoreReporter.value = Int64(score) //score variable here (same as above)
let scoreArray: [GKScore] = [scoreReporter]
GKScore.reportScores(scoreArray, withCompletionHandler: {(error : NSError?) -> Void in
if error != nil {
print("error") }
})
}
}
//shows leaderboard screen
func showLeader() {
var vc = self.view?.window?.rootViewController
var gc = GKGameCenterViewController()
gc.gameCenterDelegate = self
vc?.presentViewController(gc, animated: true, completion: nil)
}
//hides leaderboard screen
func gameCenterViewControllerDidFinish(gameCenterViewController: GKGameCenterViewController!)
{
gameCenterViewController.dismissViewControllerAnimated(true, completion: nil)
}
}
I also tried authenticating inside GameScene but that didn't work either.
Edit:
//initiate gamecenter
func authenticateLocalPlayer(){
print("Gamecenter..1")
let localPlayer = GKLocalPlayer.localPlayer()
print("Gamecenter..2")
localPlayer.authenticateHandler = {(viewController, error) -> Void in
print("Gamecenter..3")
if (viewController != nil) {
print("Not signed in. Authenticating now")
var vc = self.view?.window?.rootViewController
vc?.presentViewController(viewController!, animated: true, completion: nil)
}
else {
print((GKLocalPlayer.localPlayer().authenticated))
}
}
}
Take a look at the print statements at the function above, "Gamecenter..3" never get printed.
Edit 2:
The problem solved itself when I signed out of Gamecenter. (How stupid this kind of stuff)

Answer 1

One possibility: In your authentication handler, you never check the error code. You only check if the viewController is set or not. If the error code is set, though, the viewController will (usually) be nil, so you could be interpreting a login error as a successful login.
I would change the code to:
localPlayer.authenticateHandler = {(viewController, error) -> Void in
if (error != nil)
{
//add some stuff to report the error
}
else if (viewController != nil){
print("Not signed in. Authenticating now")
var vc = self.view?.window?.rootViewController
vc?.presentViewController(viewController!, animated: true, completion: nil)
}
else {
print((GKLocalPlayer.localPlayer().authenticated))
}
}
to confirm you're not getting an error on login. If you are getting an error, that will provide a clue as to what to look at next.
Edit
Some folks are reporting authentication problems until they add at least 1 leaderboard or achievement in iTunesConnect. In those reports, they're actually getting a login error that the game isn't recognized. But, given the inherent flakiness in game center, I would add a placeholder achievement or leaderboard to rule that issue out. (iOS9 “This game is not recognized by game center.”)