Can you explain what happens when the viewWillAppear method is called in the UIViewController lifecycle?

The viewWillAppear method is called in the UIViewController lifecycle just before its view is added to the screen and becomes visible to the user.

At this stage, you can perform actions that need to be updated every time before the screen appears, such as:

• Updating data or the interface
• Starting animations
• Configuring controls

It is important that by this point, the view has already been loaded (viewDidLoad has been called), but it has not yet been displayed.

Example usage:

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