iOS Swift create Popup Alert, Action Items Alert and Custom Alert programmatically

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        
        //Add a Simple Alert with Buttons
        let button = UIButton(frame: CGRect(x: 100, y: 100, width: 200, height: 50))
        button.setTitle("Popup Alert", for: .normal)
        button.setTitleColor(.black, for: .normal)
        button.backgroundColor = UIColor.lightGray
        button.addTarget(self, action: #selector(popupAlert), for: .touchUpInside)
        self.view.addSubview(button)
        
        //Add a Simple Alert with Action Items
        let button2 = UIButton(frame: CGRect(x: 100, y: 200, width: 200, height: 50))
        button2.setTitle("Action Alert", for: .normal)
        button2.setTitleColor(.black, for: .normal)
        button2.backgroundColor = UIColor.lightGray
        button2.addTarget(self, action: #selector(actionAlert), for: .touchUpInside)
        self.view.addSubview(button2)
        
        //Add a Custom Alert
        let button3 = UIButton(frame: CGRect(x: 100, y: 300, width: 200, height: 50))
        button3.setTitle("Custom Alert", for: .normal)
        button3.setTitleColor(.black, for: .normal)
        button3.backgroundColor = UIColor.lightGray
        button3.addTarget(self, action: #selector(customAlert), for: .touchUpInside)
        self.view.addSubview(button3)
        
    }

    @objc func popupAlert(sender: UIButton!){
        
        let alert = UIAlertController(title: "Did you bring your tennis racquet?",
                                    message: "Sure can't play tennis without it...",
                                    preferredStyle: .alert)
        
        alert.addAction(UIAlertAction(title: "Yes", style: .default, handler: { action in
            print("Great! Let's Play!")}))
        alert.addAction(UIAlertAction(title: "No", style: .cancel, handler: { action in
            print("Time to head home!")}))
        
        self.present(alert, animated: true)
        
    }
    
    @objc func actionAlert(sender: UIButton!){
        
        let alert = UIAlertController(title: "Did you bring your tennis racquet?",
                                      message: "Sure can't play tennis without it...",
                                      preferredStyle: .actionSheet)
        
        alert.addAction(UIAlertAction(title: "Yes", style: .default, handler: { action in
            print("Great! Let's Play!")}))
        alert.addAction(UIAlertAction(title: "No", style: .cancel, handler: { action in
            print("Time to head home!")}))
        
        self.present(alert, animated: true)
        
    }
    
    @objc func customAlert(sender: UIButton!){
        
        let alert = UIAlertController(title: "Did you bring your tennis racquet?",
                        message: "Sure can't play tennis without it. Let's get all the information...",
                        preferredStyle: .alert)
        
        alert.view.tintColor = UIColor.brown            // change text color of the buttons
        alert.view.backgroundColor = UIColor.lightGray  // change background color
        alert.view.layer.cornerRadius = 25              // change corner radius
        
        alert.addTextField { (textField: UITextField) in
            textField.keyboardAppearance = .dark
            textField.keyboardType = .default
            textField.autocorrectionType = .default
            textField.placeholder = "Brand Name"
        }
        
        alert.addTextField { (textField: UITextField) in
            textField.keyboardAppearance = .dark
            textField.keyboardType = .default
            textField.autocorrectionType = .default
            textField.placeholder = "Model"
        }
        
        alert.addAction(UIAlertAction(title: "Yes", style: .default, handler: { action in
            let brandName = alert.textFields![0]
            let model = alert.textFields![1]
            print("Great! Let's Play with \(brandName.text!) \(model.text!)!")
            
        }))
        alert.addAction(UIAlertAction(title: "No", style: .cancel, handler: { action in
            print("Time to head home!")}))
        
        self.present(alert, animated: true)
        
    }

}