不推荐使用playerID，目标C.

Question

什么取代了玩家ID？

- (void)lookupPlayers {

    NSLog(@"Looking up %d players...", match.players.count);
    [GKPlayer loadPlayersForIdentifiers:match.players withCompletionHandler:^(NSArray *players, NSError *error) {

        if (error != nil) {
            NSLog(@"Error retrieving player info: %@", error.localizedDescription);
            matchStarted = NO;
            [delegate matchEnded];
        } else {

            // Populate players dict
            self.playersDict = [NSMutableDictionary dictionaryWithCapacity:players.count];
            for (GKPlayer *player in players) {
                NSLog(@"Found player: %@", player.alias);
                [playersDict setObject:player forKey:player.playerID];
            }

            // Notify delegate match can begin
            matchStarted = YES;
            [delegate matchStarted];

        }
    }];

}