iOS 8 Game Center Error

问题:

I updated my XCode and iOS. My codes worked well before update. Now I can't login game center. Console gives this error

GameKitHelper ERROR: {
    NSLocalizedDescription = "The requested operation could not be completed because this application is not recognized by Game Center.";
}

回答1:

I found the answer. Sandbox is not enable in iOS 8. Need to enable Sandbox in Settings -> Game Center -> Sandbox.