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iOS Swift 2.0 Enumerations and Optionals Introduction to Enumerations Enum Methods

Michael Murray
Michael Murray
6,037 Points

Getting a compile error. Says, " Enums may not contain stored properties". Please help.

// Challenge was broken ito two files: // buttons.swift file below and enums.swift file further below.

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
}

}

// enums.swift file

enum Button { case Done(String) case Edit(String)

func toUIBarButtonItem() -> UIBarButtonItem {
    switch self {
    case Button.Done:
        return UIBarButtonItem(title: "Done", style: .Done, target: nil, action: nil )

    case Button.Edit:
    return UIBarButtonItem(title: "Edit", style: .Plain, target: nil, action: nil )
}

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

buttons.swift
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
    }
}
enums.swift
enum Button {
    case Done(String)
    case Edit(String)

    func toUIBarButtonItem() -> UIBarButtonItem {
        switch self {
        case Button.Done:
            return UIBarButtonItem(title: "Done", style: .Done, target: nil, action: nil )

        case Button.Edit:
        return UIBarButtonItem(title: "Edit", style: .Plain, target: nil, action: nil )
    }
}
let done = Button.Done("Done")
let doneButton = done.toUIBarButtonItem()

2 Answers

Michael Murray
Michael Murray
6,037 Points

Found it myself. I was missing a close bracket for the switch statement!

Alexander Smith
Alexander Smith
10,476 Points

This one was really tough needed a little refresher. Model it like this and it should be good.

enum Button {
   case Done(String)
   case Edit(String)


   func toUIBarButtonItem() -> UIBarButtonItem {
       switch self {
       case .Done(let title): return UIBarButtonItem(title: title, style: UIBarButtonStyle.Done, target: nil, action: nil)
       case .Edit(let title): return UIBarButtonItem(title: title, style: UIBarButtonStyle.Plain, target: nil, action: nil)
       }
   }
}

 let done = Button.Done("Done")
 let doneButton = done.toUIBarButtonItem()
Michael Murray
Michael Murray
6,037 Points

I added in the (let title) as you suggested (both places), but I still the compile error " enums may not contain stored properties" -referring to the following line of code: let done = Button.Done("Done")

Alexander Smith
Alexander Smith
10,476 Points

should work. try refreshing the challenge and copy paste my answer. dont alter anything else in the code either. I just tried it and it worked for me