问题描述
我正在用Swift制作游戏.我希望能够使用GameCenter发布用户的分数,以便可以看到我所有用户的分数.但是,我花了整整一天的时间试图弄清楚该如何做,但是我没有找到任何有用的说明.
我对iOS编程和Swift还是很陌生,关于这个主题的信息很少,这些都是用Objective-C编写的.
任何人都可以帮助我将GameCenter集成到我的应用中,以便我可以将用户分数发布到排行榜上,以供人们查看吗?
我已经在iTunesConnect上创建了GameCenter排行榜.
我已尝试按照本教程进行操作: http://www.appcoda.com/ios- game-kit-framework/并将其转换为Swift.我已将其转换为
-(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;
}
}
};
}
对此:
func authenticateLocalPlayer() {
var localPlayer : GKLocalPlayer!
localPlayer.authenticateHandler = {(viewController : MenuViewController!, error : NSError!) -> Void in
if viewController != nil {
self.presentViewController(viewController, animated: true, completion: nil)
} else {
if localPlayer.authenticated {
self.gameCenterEnabled = true
localPlayer.loadDefaultLeaderboardIdentifierWithCompletionHandler({ (leaderboardIdentifier : String!, error : NSError!) -> Void in
if error != nil {
println(error.localizedDescription)
} else {
self.leaderboardIdentifier = leaderboardIdentifier
}
})
} else {
self.gameCenterEnabled = false
}
}
}
}
但它在此行崩溃:
localPlayer.authenticateHandler = {(viewController : UIViewController!, error : NSError!) -> Void in
错误消息是:
我不敢相信这有多难!
您的特定问题与Game Center无关,并且正在发生,因为您有var localPlayer : GKLocalPlayer!
行.
您要声明一个隐式解包的可选内容,然后立即使用它.当您尝试设置localPlayer.authenticateHandler
时,在下一行中它的值为nil.
相反,您应该像这样实例化GKLocalPlayer:
var localPlayer = GKLocalPlayer()
请注意,Game Center和Swift当前存在问题.您的代码将正常工作,但localPlayer.authenticated
永远不会设置为true.在此跟踪此问题:
http://www.openradar.me/17825348
信用至: http://www.stuarticus .net/blog/2014/7/game-center-authentication-and-swift 提交雷达票.
I am making a game in Swift. I want to be able to post the users' score using GameCenter, so that scores from all my users' can be seen. However, I have spent the past day trying to figure out how to do this, but I haven't found any helpful instructions.
I am pretty new to iOS programming, and Swift, and of the very little amount of information on this subject, it's all written in Objective-C.
Can anyone help me integrate GameCenter into my app, so that I can post users scores to the leaderboards for people to see?
EDIT: I have already created a GameCenter leaderboard on iTunesConnect.
EDIT 2: I have tried following this tutorial: http://www.appcoda.com/ios-game-kit-framework/ and converting it to Swift. I have converted this:
-(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;
}
}
};
}
into this:
func authenticateLocalPlayer() {
var localPlayer : GKLocalPlayer!
localPlayer.authenticateHandler = {(viewController : MenuViewController!, error : NSError!) -> Void in
if viewController != nil {
self.presentViewController(viewController, animated: true, completion: nil)
} else {
if localPlayer.authenticated {
self.gameCenterEnabled = true
localPlayer.loadDefaultLeaderboardIdentifierWithCompletionHandler({ (leaderboardIdentifier : String!, error : NSError!) -> Void in
if error != nil {
println(error.localizedDescription)
} else {
self.leaderboardIdentifier = leaderboardIdentifier
}
})
} else {
self.gameCenterEnabled = false
}
}
}
}
but it crashes on this line:
localPlayer.authenticateHandler = {(viewController : UIViewController!, error : NSError!) -> Void in
The Error message is:
I can't believe how hard this is!
Your specific issue has nothing to do with Game Center and is happening because you have the line var localPlayer : GKLocalPlayer!
.
You're declaring an implicitly unwrapped optional and then using it right away. It's value is nil in the subsequent line when you try to set localPlayer.authenticateHandler
.
Instead you should instantiate GKLocalPlayer like so:
var localPlayer = GKLocalPlayer()
Note that there are currently issues with Game Center and Swift. Your code is going to work but localPlayer.authenticated
never gets set to true. This issue is tracked here:
http://www.openradar.me/17825348
Credit to: http://www.stuarticus.net/blog/2014/7/game-center-authentication-and-swiftfor filing the radar ticket.
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