Example code for https://medium.com/@PatrykPeszko/notification-pattern-a862ceff4226

Notifiable.swift

// In the past I was calling it Notification but iOS10 
// NSNotification was renamed to Notification, so ¯\_(ツ)_/¯
protocol Notifiable: RawRepresentable {

    func post(userInfo aUserInfo: [NSObject : AnyObject]?, object anObject: AnyObject?)
    func observe(observer: AnyObject, selector aSelector: Selector, object anObject: AnyObject?)

    func name() -> String

    func notificationCenter() -> NSNotificationCenter

}

extension Notifiable {

    func post(userInfo aUserInfo: [NSObject : AnyObject]? = nil, object anObject: AnyObject? = nil) {
        notificationCenter().postNotificationName(self.name(),
            object: anObject,
            userInfo: aUserInfo)
    }

    func observe(observer: AnyObject, selector aSelector: Selector, object anObject: AnyObject? = nil) {
        notificationCenter().addObserver(observer,
            selector: aSelector,
            name: name(),
            object: anObject)
    }

    func name() -> String {
        return "\(self.dynamicType).\(self.rawValue)"
    }

    func notificationCenter() -> NSNotificationCenter {
        return NSNotificationCenter.defaultCenter()
    }

    var description: String {
        return name()
    }

}