Show usage of Swift enum

ViewController.swift

import UIKit

enum Style: String {
    case light, dark
}

class ViewController: UIViewController {

    let style: Style
    
    init(style: Style) {
        self.style = style
        super.init(nibName: nil, bundle: nil)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        self.title = self.style.rawValue
        
        view.backgroundColor = {
            style in
            
            switch style {
            case .light:
                return UIColor.white
            case .dark:
                return UIColor.darkGray
            }
        }(self.style)
    }
    
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        self.setNeedsStatusBarAppearanceUpdate()
    }
    
    override var preferredStatusBarStyle : UIStatusBarStyle {
        switch self.style {
        case .light:
            return .lightContent
        case .dark:
            return .default
        }
    }
}