Explain what is meant by the viewIsAppearing event in the view lifecycle context?

The viewIsAppearing event in the view's lifecycle (for example, in iOS UIViewController) indicates that the view is about to appear on the screen but is not fully displayed yet.

In iOS, this corresponds to the viewWillAppear(_:) method, which is called before the view becomes visible to the user. Here, you can perform interface preparation, update data, start animations, or configure elements that should be current when displayed.

Example usage:

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