Connecting Itunes Connect To Code For GameCenter Leaderboard - swift

Question

I have used the code below to create my GameCenter page in my app. However, I haven't been able to connect the leaderboard that I created on iTunes Connect to my code, so the app just produces a blank leaderboard page. How do I connect my Itunes Connect leaderboard to my code, and how do I make the app such that it places your score on the leaderboard, as right now the leaderboard is empty.
Here is the code I used:
override func viewDidAppear(animated: Bool) {
//check user is logged into GameCenter
var localPlayer = GKLocalPlayer.localPlayer()
localPlayer.authenticateHandler = {(viewController : UIViewController!, error : NSError!) -> Void in
if ((viewController) != nil) {
self.presentViewController(viewController, animated: true, completion: nil)
} else {
println((GKLocalPlayer.localPlayer().authenticated))
}
}
//display leaderboard
func showLeaderboard() {
var gcViewController: GKGameCenterViewController = GKGameCenterViewController()
gcViewController.gameCenterDelegate = self
gcViewController.viewState = GKGameCenterViewControllerState.Leaderboards
gcViewController.leaderboardIdentifier = "MyLeaderboard"
self.showViewController(gcViewController, sender: self)
self.navigationController?.pushViewController(gcViewController, animated: true)
}
//take leaderboard away
func gameCenterViewControllerDidFinish(gcViewController: GKGameCenterViewController!) {
self.dismissViewControllerAnimated(true, completion: nil)
}
How do I connect my Itunes Connect leaderboard to the app, and what code do I use to upload one's score to the leaderboard?

Answer 1

Firstly add the GKGameCenterControllerDelegate to your class:
class viewController: UIViewController, GKGameCenterControllerDelegate {
...
}
This is the code you need to use to authenticate the player:
func login() {
println("Game Center Login Called")
let localPlayer = GKLocalPlayer.localPlayer()
// Handle the authentication
localPlayer.authenticateHandler = {(Home: UIViewController!, error: NSError!) -> Void in
if Home != nil {
println("Authentication is being processed.")
self.presentViewController(Home, animated: true, completion: nil)
} else {
println("Player has been successfully authenticated.")
}
}
}
This is the code you should use to show up the leaderboard:
func showLeaderboard() {
var gcViewController: GKGameCenterViewController = GKGameCenterViewController()
gcViewController.gameCenterDelegate = self
gcViewController.viewState = GKGameCenterViewControllerState.Leaderboards
gcViewController.leaderboardIdentifier = "YOUR_LEADERBOARD_ID"
self.showViewController(gcViewController, sender: self)
self.presentViewController(gcViewController, animated: true, completion: nil)
}
This code is needed when the user taps on "Done".
func gameCenterViewControllerDidFinish(gcViewController: GKGameCenterViewController!)
{
self.dismissViewControllerAnimated(true, completion: nil)
}
You can call the authentication method login() in the viewDidLoad method:
override func viewDidLoad() {
super.viewDidLoad()
login()
...
}
Show up the leaderboard when the user taps on a button
#IBAction func button(sender: AnyObject) {
showLeaderboard()
}
If you want to submit the best score:
if GKLocalPlayer.localPlayer().authenticated {
println("I have submitted the score to Game Center")
let gkScore = GKScore(leaderboardIdentifier: "Best_Score")
gkScore.value = Int64(bestScore)
GKScore.reportScores([gkScore], withCompletionHandler: ( { (error: NSError!) -> Void in
if (error != nil) {
// handle error
println("Error: " + error.localizedDescription);
} else {
println("Score reported: \(gkScore.value)")
}
}))
}