GameCenter接入

问题一：The requested operation could not be completed because this application is not recognized by Game Center.

Domain=GKErrorDomain Code=15 "The requested operation could not be completed because this application is not recognized by Game Center." UserInfo=0x17d08ee0 {NSLocalizedDescription=The requested operation could not be completed because this application is not recognized by Game Center.}

解决办法：

Just need to enable Sandbox in Settings--> Game Center --> Sandbox.

参考链接：http://stackoverflow.com/questions/25891250/game-center-authentication-doesnt-work-in-ios-8

问题二：The requested operation has been cancelled.

Error Domain=GKErrorDomain Code=2 "The requested operation has been cancelled." UserInfo=0x1fdc4740 {NSLocalizedDescription=The requested operation has been cancelled.}

原因：

如果用户多次调用gamecenter，但是又取消登录，苹果就会认为用户取消登录，后续就无法正常登录了。

解决办法：

在设置->gamecenter中登录，后续游戏便可正常调用gamecenter登录