import UIKit

protocol Actionable {
    func action()
}

extension UIResponder: Actionable {
    func action() {
        next?.action()
    }
}

class ViewModel: UIResponder {
    override func action() {
        print("action")
    }
}

class MyView: UIView {
    func tapped() {
        next?.action()
    }
}

class ViewController: UIViewController {
    let viewModel = ViewModel()
    let myView = MyView()

    override var next: UIResponder? {
        return viewModel
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        view.addSubview(myView)
    }
}

let controller = ViewController(nibName: nil, bundle: nil)
_ = controller.view
controller.myView.tapped()