AuthenticationManager.swift

protocol AuthenticationManagerDelegate: class {
    func userDidLogout()
    func userDidLogin(_ user: User)
}

@objc class AuthenticationManager: NSObject  {
    
    static let sharedInstace = AuthenticationManager()
    public var user: User?
    
    public var multicastDelegate =  MulticastDelegate<AuthenticationManagerDelegate>()

    func logout()->() {
      self.multicastDelegate.invoke({ $0.userDidLogout() })
    }

    func login(email: String, password: String, completionHandler: @escaping (LoginResponseResult)->())->() {
      /*Network request to get user object with email and password*/
      self.user = user
      multicastDelegate.invoke({ $0.userDidLogin(user)})
      completionHandler(.success(user))
    }
}