ViewControllerPresentAlert.swift

import UIKit

class ViewController: UIViewController {
    
    lazy var blueView: ViewControllerView = {
        let view = ViewControllerView(viewColor: .systemBlue)
        return view
    }()
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        presentAlert(title: "Hello", body: "World")
    }
    
    override func loadView() {
        view = blueView
    }
    
    @objc private func presentAlert(title: String, body: String) {
        let alertController = UIAlertController(title: title, message: body, preferredStyle: .alert)
        let action = UIAlertAction(title: "Ok", style: .default)
        alertController.addAction(action)
        present(alertController, animated: true)
    }

}