ProtocolOrientedFinalViewController.swift

class BuzzableTextField: UITextField, Buzzable {}
class BuzzableButton: UIButton, Buzzable {}
class BuzzableImageView: UIImageView, Buzzable {}
class BuzzablePoppableLabel: UILabel, Buzzable, Poppable {}

class LoginViewController: UIViewController {
  @IBOutlet weak var passcodTextField: BuzzableTextField!
  @IBOutlet weak var loginButton: BuzzableButton!
  @IBOutlet weak var errorMessageLabel: BuzzablePoppableLabel!
  @IBOutlet weak var profileImageView: BuzzableImageView!
  
  @IBAction func didTabLoginButton(_ sender: UIButton) {
    passcodTextField.buzz()
    loginButton.buzz()
    errorMessageLabel.buzz()
    errorMessageLabel.pop()
    profileImageView.buzz()
  }
}