gistfile1.swift

import Foundation

class NotificationCenter {
  func addObserver(name: String, object: AnyObject, callback: (NSDictionary) -> Void ) -> NSObjectProtocol {
    var observer : NSObjectProtocol = NSNotificationCenter.defaultCenter().addObserverForName(name, object: object, queue: nil, usingBlock: {
      (notification : NSNotification!) in
        callback(notification.userInfo)
    })

    return observer
  }

  func addObserver(name: String, object: AnyObject, callback: Void -> Void ) -> NSObjectProtocol {
    var observer : NSObjectProtocol = NSNotificationCenter.defaultCenter().addObserverForName(name, object: object, queue: nil, usingBlock: {
      (notification : NSNotification!) in
        callback()
    })

    return observer
  }

  func removeObserver(observer: NSObjectProtocol) {
    NSNotificationCenter.defaultCenter().removeObserver(observer)
  }

  func postNotification(name: String, object: AnyObject, userInfo: NSDictionary) {
    NSNotificationCenter.defaultCenter().postNotificationName(name, object: object, userInfo: userInfo)
  }
}