爲什麼localPlayer.displayName是「我」？

Question

在an iPhone app我獲取由下面的代碼遊戲中心本地球員GameCenterViewController.m：

- (void)fetchUser 
{ 
    __weak GKLocalPlayer *localPlayer = [GKLocalPlayer localPlayer]; 
    localPlayer.authenticateHandler = ^(UIViewController *viewController, NSError *error) { 
     if (viewController != nil) { 
      [self presentViewController:viewController 
           animated:YES 
          completion:nil]; 

     } else if (localPlayer.isAuthenticated) { 
      NSLog(@"%s: displayName=%@ playerID=%@", __PRETTY_FUNCTION__, 
        [localPlayer displayName], 
        [localPlayer playerID]); 

      User *user  = [[User alloc] init]; 
      user.userId = [localPlayer playerID]; 
      user.firstName = [localPlayer displayName]; 
      [user save]; 

      dispatch_async(dispatch_get_main_queue(), ^(void){ 
       [self performSegueWithIdentifier: @"replaceGameCenter" sender: self]; 
      }); 
     } 

     NSLog(@"%s: error=%@", __PRETTY_FUNCTION__, error); 
    }; 
} 

相應的調試器輸出和屏幕截圖低於：

__37-[GameCenterViewController fetchUser]_block_invoke: displayName=Me playerID=G:216741811 
__37-[GameCenterViewController fetchUser]_block_invoke: error=(null) 

爲什麼我在那裏得到「我」而不是「farber72」？

Answer 1

你在標題中看到的可能是播放器alias。