NSNotificationCenter wrapper in swift

KVOManager.swift

import Foundation

enum KVOManagerNotificationType: String {
  case StickerBought = "com.mojilala.Stickers.Keyboard.StickerBought"
}

class KVOManager: NSObject {
  static let sharedManager = KVOManager()

  func addObserver(
    toObject object: NSObject,
    forNotificationType notificationType: KVOManagerNotificationType,
    withActionHandler actionHandler: (NSNotification) -> Void) {
    NSNotificationCenter.defaultCenter().addObserverForName(
      notificationType.rawValue,
      object: nil,
      queue: nil,
      usingBlock: actionHandler)
  }

  func removeObserver(fromObject object: NSObject, forNotificationType notificationType: KVOManagerNotificationType) {
    NSNotificationCenter.defaultCenter().removeObserver(
      object,
      name: notificationType.rawValue,
      object: nil)
  }

  func postNotification(forNotificationType notificationType: KVOManagerNotificationType) {
    NSNotificationCenter.defaultCenter().postNotificationName(
      notificationType.rawValue,
      object: nil)
  }
}