Using NotificationCenter with UIView subclass: http://swiftiostutorials.com/quick-tip-adding-removing-nsnotificationcenter-observers-uiview-subclass/

NotificationView.swift

// Swift 3

import UIKit

class TestView: UIView {
    
// MARK: Observers
    
    override func didMoveToWindow() {
        
        if self.window != nil {
            NotificationCenter.default.addObserver(self, selector: #selector(test(_:)), name: NSNotification.Name(rawValue: "TestNotification"), object: nil)
        }
    }
    
    override func willMove(toWindow newWindow: UIWindow?) {
        
        if newWindow == nil {
            NotificationCenter.default.removeObserver(self, name: NSNotification.Name(rawValue: "TestNotification"), object: nil)
        }
    }
    
// MARK: Actions
    
    func test(_ notification : Notification) {
        print("Test")
    }
}