Can someone clarify here if this challenge is accurate? It seems to be referring to deprecated classes.

// Example of UIBarButtonItem instance
// let someButton = UIBarButtonItem(title: "A Title", style: .plain, target: nil, action: nil)

enum BarButton {
    case done(title: String)
    case edit(title: String)

    func button -> UIBarButtonItem {
        switch self {
        case .done(let title, let style, let target, let action):
            return UIBarButtonStyle.done(title: "A Title", style: .plain, target: nil, action: nil)
        case .done(let title, let style, let target, let action):
            return UIBarButtonStyle.plain(title: "A Title", style: .plain, target: nil, action: nil)
        }
    }

}

let doneButton = BarButton.done(title: "Save").button()