NetworkingEvolution_Step2_NetworkClient.swift

import Alamofire
import SwiftyJSON

struct NetworkClient {
  static func makeRequest(url: String,
                          params: [String : AnyObject],
                          callback: (JSON?, ErrorType?) -> Void)
  {
    request(.POST, url, parameters: params).response { _, _, data, error in
      if let jsonData = data where error == nil {
        let json = JSON(data: jsonData)
        callback(json, nil)
      }
      else {
        callback(nil, error)
      }
    }
  }
}