启动时，我试图通过在每个设备上调用此方法以编程方式清除我的设备之间的游戏中心服务器上的所有比赛：
/**
* called to authenticate the players game centre id
*/
- (void)authenticateLocalUser
{
if (!self.gameCentreAvailable) return;
NSLog(@"Authenticating Local User.");
if ([GKLocalPlayer localPlayer].authenticated == NO)
{
[[GKLocalPlayer localPlayer] setAuthenticateHandler:^(UIViewController* viewcontroller, NSError *error)
{
NSLog(@"Inside Authentication Handler.");
// if there was no error, and we got a valid view controller to display
if (!error && viewcontroller)
{
// get a handle to the app delegate
AppDelegate *delegate = [UIApplication sharedApplication].delegate;
// use the view controller in the app delegate to present the authentication view controller
[delegate.viewController presentViewController:viewcontroller animated:YES completion:
^{
// once the view controller has been displayed, register the change in authentication
[self authenticationChanged];
}];
// set this class as the event handler delegate
GKTurnBasedEventHandler *event = [GKTurnBasedEventHandler sharedTurnBasedEventHandler];
event.delegate = self;
}
// load all of the matches the player is currently a part of
[GKTurnBasedMatch loadMatchesWithCompletionHandler:^(NSArray *matches, NSError *error)
{
NSLog(@"Error loading matches: %@", error);
// for each match
for (GKTurnBasedMatch *match in matches)
{
// log the id of the match
NSLog(@"ID of match we are removing: %@", match.matchID);
// and then remove it
[match removeWithCompletionHandler:^(NSError *error)
{
NSLog(@"Error removing match: %@", error);
}];
}
}];
}];
}
else
NSLog(@"Already Authenticated.");
}
但是，该方法不起作用，而是在控制台中收到此错误：
2012-11-05 08:32:39.699 纺纱 [6266:907] 删除匹配时出错：错误域 = GKErrorDomain 代码 = 17 “请求的操作无法完成，因为一个或多个参数无效。” UserInfo=0x1e5b2140 {NSLocalizedDescription=请求的操作无法完成，因为一个或多个参数无效。}
发生的唯一错误是在 removeWithCompletionHandler 内部：其他一切都很好，并且没有错误。
任何帮助都是极好的。