class OverlayView : UIView { // ... previous code lazy var titleLabel : UILabel = { let titleLabel = UILabel () titleLabel . translatesAutoresizingMaskIntoConstraints = false return titleLabel }() lazy var containerView : UIView = { let view = UIView () view . translatesAutoresizingMaskIntoConstraints = false return view }() lazy var backgroundView : UIView = { let view = UIView () view .