AnimalsViewController

MasteringFocusExample6.swift

class AnimalsViewController: UIViewController {
  let dogButton: UIButton
  let catButton: UIButton
  let pigButton: UIButton

  override func viewDidLoad() {
    super.viewDidLoad()

    view.addSubview(dogButton)
    view.addSubview(catButton)
    view.addSubview(pigButton)
    
    // ...
  }
  
  // ...
}