NotificationCenter.swift

extension NotificationCenter {
  func post(_ notification:NotificationType, object:Any? = nil) {
    post(name: notification.name, object: object, userInfo: notification.userInfo)
  }
  
  func addObserver<T:NotificationType>(forType type: T.Type, object obj: Any? = nil, queue: OperationQueue? = nil, 
    using block: @escaping (T?) -> Swift.Void) -> NSObjectProtocol {
    return addObserver(forName: type.name, object: obj, queue: queue) { 
      block( type.init(notification: $0) ) 
    }
  }
}