notification-swift3.swift

// Basic.swift
extension Notification.Name {
    func post(object:Any? = nil, userInfo:[AnyHashable: Any]? = nil) {
        NotificationCenter.default.post(self, object: object, userInfo: userInfo)
    }
}

// DataModel.swift
extension Notification.Name {
    static let AccountBalanceUpdated = Notification.Name("accountBalanceUpdated")
}

// Sample Usage ..
Notification.Name.AccountBalanceUpdated.post(myAccountObject);

For better explanation - see http://peatiscoding.me/geek-stuff/using-notification-name-swift-3/.

addObservers:

func addObserver(_ observer: Any, selector aSelector: Selector, object anObject: Any?) {
      NotificationCenter.default.addObserver(observer, selector: aSelector, name: self, object: anObject)
 }

func addObserver(forObject obj: Any?, queue: OperationQueue?, using block: @escaping (Notification) -> Void) {
   NotificationCenter.default.addObserver(forName: self, object:obj, queue:queue, using: block)
}