[iOS] 스토리보드에서 특정 화면에서만 사용하는 복잡한 뷰를 분리하여 동적으로 붙이기

class ViewController: UIViewController {

  @IBOutlet weak var sampleView: UIView!

  override func viewDidLoad() {
    super.viewDidLoad()

    view.addSubview(sampleView)
    view.leadingAnchor.constraint(equalTo: sampleView.leadingAnchor, constant: 0).isActive = true
    view.trailingAnchor.constraint(equalTo: sampleView.trailingAnchor, constant: 0).isActive = true
    view.centerYAnchor.constraint(equalTo: sampleView.centerYAnchor, constant: 0).isActive = true
    sampleView.heightAnchor.constraint(equalToConstant: 100).isActive = true
    sampleView.translatesAutoresizingMaskIntoConstraints = false
  }
}