JSON <--> Dictionary

jsonDictionary.m

/// Dictionary --> JSON.
- (void)dictionaryToJson {
    // `message: NSDictionary` to send to server.
    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:message
                                                       options:0
                                                         error:nil];
    [self.socket send:jsonData];
}

/// JSON --> Dictionary.
- (void)jsonToDictionary {
    // `message: NSString` came back from socket.
    NSData *objectData = [message dataUsingEncoding:NSUTF8StringEncoding];
    NSDictionary *json = [NSJSONSerialization JSONObjectWithData:objectData
                                                         options:NSJSONReadingMutableContainers
                                                           error:nil];
}

jsonDictionary.swift

/// Dictionary --> JSON.
func send(messageDict: [String: Any]) {
  do {
    let messageData = try JSONSerialization.data(withJSONObject: messageDict, options: JSONSerialization.WritingOptions.prettyPrinted)
    socket.send(messageData)
  } catch (let error) {
    fatalError("\(error)")
  }
}

/// JSON --> Dictionary.
func webSocket(_ webSocket: SRWebSocket!, didReceiveMessage message: Any!) {
  guard let message = message as? String,
    let data = message.data(using: .utf8) else { return }
  do {
    let json = try JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.mutableContainers)
    guard let payload = json as? SocketManager.Payload else { return }
    guard let command = ServerCommand(payload: payload) else { return }
    delegate?.didReceive(command: command, payload: nil)
  } catch (let error) {
    fatalError("\(error)")
  }
}