Notification Center Design

class NotificationCenter {
    static let shared = NotificationCenter()
    
    // notification to (class name and closures)
    private var notificationsStorage = [String: [(String: [(String, Any) -> Void)]]]()
    
    private init() { }
    
    func addObserver(_ class: Any?, name: String, closure: @escaping (String, Any) -> Void) { }
    
    func removeObserver(_ class: Any?, name: String) { }
    
    func postNotification(_ name: String, _ object: Any?) { }
}