Retrieve Scores from Leaderboard

GKLeaderboard* leaderboard = nil; if ([players count] > 0) {     leaderboard = [[[GKLeaderboard alloc] initWithPlayerIDs:players] autorelease]; } else {     leaderboard = [[[GKLeaderboard alloc] init] autorelease];     leaderboard.playerScope = playerScope; } if (leaderboard != nil) {     leaderboard.timeScope = timeScope;     leaderboard.category = category;     leaderboard.range = range;     [leaderboard loadScoresWithCompletionHandler:^(NSArray* scores, NSError* error)     {         NSMutableArray *retrievePlayerIDs = [[[NSMutableArray alloc]init]autorelease];              for (GKScore *s in scores)         {             [retrievePlayerIDs addObject:s.playerID];                 }              [GKPlayer loadPlayersForIdentifiers:retrievePlayerIDs withCompletionHandler:^(NSArray *playerArray, NSError *error)          {              NSMutableArray *retrievePlayerAlias = [[[NSMutableArray alloc]init]autorelease];              for (GKPlayer* player in playerArray)              {                  NSLog(@"Player : %@",player.alias);              }          }];      }]; }