At what phase of the UIViewController lifecycle is NSLayoutConstraint set?

Setting NSLayoutConstraint in UIViewController usually occurs in the viewDidLoad or updateViewConstraints method.

• In viewDidLoad, it is convenient to create and activate constraints once after the view has loaded.
• The updateViewConstraints method is called when there is a need to update constraints and is suitable for dynamically changing constraints.

Most often, constraints are created and activated in viewDidLoad to establish the basic layout of the interface.