SampleViewController.swift

final class SampleViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let button = UIButton(type: .System)

        // ...

        button.addTarget(self, action: #selector(SampleViewController.buttonTapped(_:)), forControlEvents: .TouchUpInside)
        view.addSubview(button)
    }

    /**
     Handle .TouchUpInside event on the button in SampleViewController.
     This is a method associated with an action selector, not meant to be called externally.

     - parameter button: The button that was tapped
     */
    func buttonTapped(button: UIButton) {
        print("Selector method called!")
    }
}