addObserver1.swift

// 1
extension Notification.Name {
    static let profileUpdated = Notification.Name("OnProfileUpdated")
}

class ViewController: UIViewController {
    //...
    //...
    override func viewDidLoad() {
        super.viewDidLoad()
        initObserver()
    }
    
    // 2
    func initObserver() {
        // Register to receive notification
        NotificationCenter.default.addObserver(self, selector: #selector(self.updateUI(_:)), name: NSNotification.Name.profileUpdated, object: nil)
    }
  
    // 3
    @objc private func updateUI(_ notification: Notification) {
        // 4
        guard let userInfo = notification.userInfo else { return }
        if let title = userInfo["title"] as? String {
            // print title
        }
        if let subtitle = userInfo["subtitle"] as? String {
            // print subtitle
        }
        if let image = userInfo["image"] as? UIImage {
            // do something with the image
        }
    }
    // ...
}