Convenience Auto Layout methods and ability to apply your constraints through a function builder
someView.extendToSuperview()
someOtherView.extendToSuperviewLayoutMargins()
centeredView.center(in: mySpecialLayoutGuide)someView.applyConstraints {
$0.leadingAnchor.constraint(equalTo: contentView.layoutMarginsGuide.leadingAnchor)
$0.centerYAnchor.constraint(equalTo: contentView.layoutMarginsGuide.centerYAnchor)
}