How to build a URL based on information passed on pushViewController

HomeViewController.swift

import UIKit
import PlaygroundSupport

enum Styles {

    enum Colors {
        static let buttonBackgroundColor = UIColor(red: 72/255,
                                                   green: 199/255,
                                                   blue: 116/255,
                                                   alpha: 1)
    }
}

class HomeViewController: UIViewController {

    enum Settings {
        static let videoId = "9e074ec5"
    }

    let toDetailButton: UIButton = {
        let button = UIButton()
        button.translatesAutoresizingMaskIntoConstraints = false
        button.setTitle("To video \(Settings.videoId)",
                        for: .normal)
        button.backgroundColor = Styles.Colors.buttonBackgroundColor
        button.setTitleColor(.white, for: .normal)
        button.layer.cornerRadius = 4
        button.titleLabel?.font = UIFont.systemFont(ofSize: 16)
        button.contentEdgeInsets = UIEdgeInsets(top: 0,
                                                left: 16,
                                                bottom: 0,
                                                right: 16)
        return button
    }()

    override func viewDidLoad() {
        super.viewDidLoad()

        title = "Home"
        view.backgroundColor = .white
        view.addSubview(toDetailButton)

        NSLayoutConstraint.activate([
            toDetailButton.centerXAnchor.constraint(equalTo: view.centerXAnchor),
            toDetailButton.centerYAnchor.constraint(equalTo: view.centerYAnchor),
            toDetailButton.heightAnchor.constraint(equalToConstant: 40),
        ])

        toDetailButton.addTarget(self,
                                 action: #selector(onToDetailButton),
                                 for: .touchUpInside)
    }

    @objc
    private func onToDetailButton() {
        let detailViewController = DetailViewController(videoId: Settings.videoId)
        navigationController?.pushViewController(detailViewController,
                                                 animated: true)
    }
}

class DetailViewController: UIViewController {

    enum Settings {
        static let endpoint = URL(string: "http://download.appboomclap.co.kr/content")!
        static let fileExtention = "mp4"
    }

    let videoId: String

    let videoUrlLabel: UILabel = {
        let label = UILabel()
        label.translatesAutoresizingMaskIntoConstraints = false
        label.font = UIFont.systemFont(ofSize: 16)
        label.numberOfLines = 2
        label.textAlignment = .center
        return label
    }()

    init(videoId: String) {
        self.videoId = videoId
        super.init(nibName: nil, bundle: nil)
    }

    required init?(coder: NSCoder) {
        fatalError("TODO")
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        title = "Detail"
        view.backgroundColor = .white
        view.addSubview(videoUrlLabel)

        NSLayoutConstraint.activate([
            videoUrlLabel.leftAnchor.constraint(equalTo: view.leftAnchor,
                                                constant: 20),
            videoUrlLabel.rightAnchor.constraint(equalTo: view.rightAnchor,
                                                 constant: -20),
            videoUrlLabel.centerYAnchor.constraint(equalTo: view.centerYAnchor),
        ])

        let url = urlBuilder()
        videoUrlLabel.text = url.absoluteString
    }

    private func urlBuilder() -> URL {
        let url = Settings
            .endpoint
            .appendingPathComponent(videoId)
            .appendingPathExtension(Settings.fileExtention)
        return url
    }
}

let viewController = HomeViewController()
let navigationController = UINavigationController(rootViewController: viewController)
PlaygroundPage.current.liveView = navigationController