public protocol SimpleViewControllerDelegate: class {
  func simpleViewControllerAction(_ viewController: SimpleViewController)
}

public final class SimpleViewController {

  // MARK: - Public Properties

  public weak var delegate: SimpleViewControllerDelegate? = nil

  // MARK: - Initialization

  public convenience init(delegate: SimpleViewControllerDelegate) {
    self.init()
    self.delegate = delegate
  }

  // MARK: - IBActions

  @IBAction func action() {
    self.delegate?.simpleViewControllerAction(self)
  }

}