Swift :: Service for Notifications

notificationService.swift

import Foundation


class NotificationService {
    static private var _instance: NotificationService! = nil
    
    static var sharedInstance: NotificationService {
        get {
            if NotificationService._instance == nil {
                NotificationService._instance = NotificationService()
            }
            
            return NotificationService._instance
        }
    }
    
    private init() {}
    
    func post(name: String!, data: Any?) {
        NotificationCenter.default.post(name: self.buildEventName(name), object: data)
    }
    
    func on(name: String!, handler: @escaping (Notification) -> Void) -> NSObjectProtocol{
        return NotificationCenter.default.addObserver(forName: self.buildEventName(name),
                                               object: nil,
                                               queue: nil,
                                               using: handler)
    }
    
    func remove(observer: NSObjectProtocol) {
        NotificationCenter.default.removeObserver(observer)
    }
    
    private func buildEventName(_ name: String!) -> Notification.Name {
        return NSNotification.Name(rawValue: name)
    }
}