My first SwiftUI Hello World - View centered vertically and horizontally, on every tap it changes colors and count number of taps

ViewController.swift

//
//  ViewController.swift
//  CenterElement
//

import UIKit
import SwiftUI

class ViewController: UIViewController {
    var squareView: UIView!
    var label: UILabel!
    var tapCount: Int = 0

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        
        view.backgroundColor = .white

        // add the view to the main view
        squareView = UIView()
        view.addSubview(squareView)
        
        // add text to the square
        label = UILabel()
        squareView.addSubview(label)
        squareView.backgroundColor = .black
        squareView.translatesAutoresizingMaskIntoConstraints = false
        
        
        // define the constrants for centering the square view
        NSLayoutConstraint.activate([
            squareView.widthAnchor.constraint(equalTo: view.widthAnchor, multiplier: 0.3).withPriority(.defaultLow),
            
            // Let the squareView grow based on the label's width
            squareView.widthAnchor.constraint(greaterThanOrEqualTo: label.widthAnchor, constant: 16),

            squareView.heightAnchor.constraint(equalTo: squareView.widthAnchor),
            squareView.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            squareView.centerYAnchor.constraint(equalTo: view.centerYAnchor)
        ])
        
        // make the square interactive
        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(squareTapped))
        squareView.addGestureRecognizer(tapGesture)
        squareView.isUserInteractionEnabled = true
        squareView.layer.cornerRadius = 20
        squareView.clipsToBounds = true
        
        // use the custom roundCorners helper
        squareView.layer.maskedCorners = [.layerMaxXMinYCorner]
        
        // squareView text styles
        label.text = "Hello World"
        label.textColor = .white
        label.textAlignment = .center
        label.font = UIFont.boldSystemFont(ofSize: 16)
        label.translatesAutoresizingMaskIntoConstraints = false
        
        NSLayoutConstraint.activate([
            label.centerXAnchor.constraint(equalTo: squareView.centerXAnchor),
            label.centerYAnchor.constraint(equalTo: squareView.centerYAnchor),
            label.widthAnchor.constraint(lessThanOrEqualTo: squareView.widthAnchor, multiplier: 0.9)
        ])
    }
    
    @objc func squareTapped() {
        tapCount += 1

        let corners: CACornerMask

        // Animate the color changes
        UIView.animate(withDuration: 0.25, delay: 0, options: [.allowUserInteraction, .curveEaseInOut]) {
           self.view.backgroundColor = .random
           self.squareView.backgroundColor = .random
           self.label.textColor = .random
        }

        label.text = "Hello World \(tapCount)"

        switch tapCount % 4 {
        case 0:
            corners = [.layerMaxXMinYCorner]
        case 1:
            corners = [.layerMaxXMaxYCorner]
        case 2:
            corners = [.layerMinXMaxYCorner]
        case 3:
            corners = [.layerMinXMinYCorner]
        default:
            corners = []
        }

        squareView.layer.maskedCorners = corners
    }
}

extension UIColor {
    static var random: UIColor {
        return UIColor(
            red: .random(in: 0...1),
            green: .random(in: 0...1),
            blue: .random(in: 0...1),
            alpha: 1.0
        )
    }
}


extension UIView {
    func roundCorners(_ corners: UIRectCorner, radius: CGFloat) {
        let path = UIBezierPath(
            roundedRect: self.bounds,
            byRoundingCorners: corners,
            cornerRadii: CGSize(width: radius, height: radius)
        )
        let mask = CAShapeLayer()
        mask.path = path.cgPath
        self.layer.mask = mask
    }
}

extension NSLayoutConstraint {
    func withPriority(_ priority: UILayoutPriority) -> NSLayoutConstraint {
        self.priority = priority
        return self
    }
}