At what stage in the lifecycle of a View Controller is the calculation and setting of constraints performed?

Calculating and setting constraints for the View Controller is usually done in the updateViewConstraints() method.

The lifecycle of a View Controller includes several stages, and constraints should be set after the view hierarchy is created but before the views are displayed.

Key points:

• loadView() — creating and initializing the view.
• viewDidLoad() — configuring the view, adding subviews.
• updateViewConstraints() — a place to update and set Auto Layout constraints.

This method is called automatically by the system when constraints need to be updated. If you override it, don't forget to call super.updateViewConstraints().

Example:

override func updateViewConstraints() {
    // Update or set constraints
    super.updateViewConstraints()
}