Have you studied the interface of the ViewController class?

UIViewController is the base class for all view controllers in iOS. It manages the screen's lifecycle, handles user interactions, and navigation.

Key aspects of the UIViewController interface:

• Lifecycle methods: viewDidLoad(), viewWillAppear(), viewDidAppear(), viewWillDisappear(), viewDidDisappear() — allow executing code during the loading and display of the controller.
• View management: the view property contains the controller's root view.
• Navigation: supports transitions between controllers, for example via navigationController.
• Handling screen rotations and interface adaptation.

Example of lifecycle usage:

class MyViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        // Initialize interface
        view.backgroundColor = .white
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        // Update data before display
    }
}