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iOS Swift 2.0 Enumerations and Optionals Introduction to Enumerations Enum Methods

Little confused

I've been looking this over and I'm still a little confused. I think I have an okay grasp on the concepts, but I'm having a hard time understanding what the challenge is asking for.

import Foundation

enum UIBarButtonStyle {
    case Done
    case Plain
    case Bordered

class UIBarButtonItem {

    var title: String?
    let style: UIBarButtonStyle
    var target: AnyObject?
    var action: Selector

    init(title: String?, style: UIBarButtonStyle, target: AnyObject?, action: Selector) {
        self.title = title
        self.style = style
        self.target = target
        self.action = action
enum Button {
    case Done(String)
    case Edit(String)

    func toUIBarButtonItem(title: String?, style: UIBarButtonStyle, target: AnyObject?, action: Selector) -> UIBarButtonItem {
    return UIBarButtonItem(title: title, style: style, target: target, action: action)

let done: Button = .Done("Done")
let doneButton = Button.toUIBarButtonItem()