8

我想为多部 iPhone 之间的流数据设置客户端-服务器架构。例如,“服务器”iPhone 拥有一份动物主列表。任意数量的客户端 iPhone 可以连接到服务器 iPhone,然后读取和编辑列表。我尝试过的一些方法:

  • 多点连接 - 最多仅支持 8 个客户端。如果有办法解决这个问题,这正是我正在寻找的
  • GameKit - 我读到蓝牙连接在处理多个客户端时可能会出现问题
  • BLE - 蓝牙的特征值限制为 512 个八位字节。我假设动物列表在存档时可能会增长到大于最大特征值。
  • 套接字 - 我宁愿不必依赖外部服务器

我愿意接受“hacky”解决方案。我正在考虑将每个动物作为一个单独的特征进行广播,但这可能会减慢发现速度,而且我觉得这会引起其他一些麻烦。任何帮助将不胜感激

4

1 回答 1

14

Multipeer Connectivity 每个会话仅支持 8 个对等点,但它支持多个会话。在您的情况下,如果有一个带有许多客户端的“服务器”设备,并且客户端不需要互相看到,那么“服务器”可以根据需要创建新会话。

因此,当“服务器”对等方充当广告商并接受邀请时,有一种方法可以返回现有会话或创建新会话:

- (MCSession *)availableSession {

   //Try and use an existing session (_sessions is a mutable array)
   for (MCSession *session in _sessions)
       if ([session.connectedPeers count]<kMCSessionMaximumNumberOfPeers)
           return session;

    //Or create a new session
    MCSession *newSession = [self newSession];
    [_sessions addObject:newSession];

    return newSession;
}

- (MCSession *)newSession {

    MCSession *session = [[MCSession alloc] initWithPeer:_myPeerID securityIdentity:nil encryptionPreference:MCEncryptionNone];
    session.delegate = self;

    return session;
}

- (void)advertiser:(MCNearbyServiceAdvertiser *)advertiser didReceiveInvitationFromPeer:(MCPeerID *)peerID withContext:(NSData *)context invitationHandler:(void (^)(BOOL, MCSession *))invitationHandler {

    MCSession *session = [self availableSession];
    invitationHandler(YES,session);
}

然后我有这种发送方法:

- (void)sendData:(NSData *)data toPeers:(NSArray *)peerIDs reliable:(BOOL)reliable error:(NSError *__autoreleasing *)error {

    if ([peerIDs count]==0)
        return;

    NSPredicate *peerNamePred = [NSPredicate predicateWithFormat:@"displayName in %@", [peerIDs valueForKey:@"displayName"]];

    MCSessionSendDataMode mode = (reliable) ? MCSessionSendDataReliable : MCSessionSendDataUnreliable;

    //Need to match up peers to their session
    for (MCSession *session in _sessions){

        NSError __autoreleasing *currentError = nil;

        NSArray *filteredPeerIDs = [session.connectedPeers filteredArrayUsingPredicate:peerNamePred];

        [session sendData:data toPeers:filteredPeerIDs withMode:mode error:&currentError];

        if (currentError && !error)
            *error = currentError;
    }
}

There are certainly performance optimizations that can be made to this approach, but for the frequency with which I am sending data to peers this has worked well enough.

于 2014-01-03T15:46:13.833 回答