What is the role of the view controller and why is it important in application architecture?

The View Controller in iOS is responsible for managing the user interface and user interactions. It links the model data with visual elements, handles events (such as button presses), and updates the interface.

Its importance in the application architecture lies in providing separation of concerns: the model handles data, the view handles display, and the controller manages the interaction logic between them. This simplifies maintenance and development of the application.

Example: UIViewController contains lifecycle methods where you can set up the interface and handle user actions.

class MyViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        // Set up the interface
    }

    @IBAction func buttonTapped(_ sender: UIButton) {
        // Handle button tap
    }
}