Protocol that loads some JSON from a file in the main bundle (Uses SwiftyJSON).

DataLoaderProtocol

import Foundation
import SwiftyJSON

protocol DataLoader { }

extension DataLoader {
  func loadJSON(fileName: String, type: String = "json") -> JSON? {
    let filePath = NSBundle.mainBundle().pathForResource(fileName, ofType: type)
    if let data = NSData(contentsOfFile: filePath!) {
      let json = JSON(data: data)
      return json
    }
    return nil
  }
}