gistfile1.txt

private lazy var actionButton: UIButton = UIButton.create {
	// Do
	$0.backgroundColor = .blue
	$0.setTitle(.., for: .normal)

	// maybe add own constraints?
	constrainSquare($0, withSideLength: 40)

	// Don't
	self.view.addSubview($0)
	$0.reactive.pressed = Action...
}

override func viewDidLoad() {
  super.viewDidLoad()
  
  // Add subview and hook up actions at explicit time
  view.addSubview(actionButton)
  actionButton.reactive.pressed = ...
}