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iOS Swift 2.0 Enumerations and Optionals Introduction to Enumerations Enum Methods

Posted by Billy Potts
Billy Potts
Courses Plus Student 2,344 Points

its saying that enums may not contain stored properties can someone explain whats wrong

im lost

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 .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()

2 Answers

Guillem Servera
Guillem Servera
12,747 Points
Guillem Servera
Guillem Servera
12,747 Points

You're doing right, but it seems like you're missing the closing '}' of your function

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)
        }
    } // <-- This one!
}

let done = Button.Done("Done")
let doneButton = done.toUIBarButtonItem()
Martin Wildfeuer
PLUS
Martin Wildfeuer
Courses Plus Student 11,071 Points
Martin Wildfeuer
Martin Wildfeuer
Courses Plus Student 11,071 Points

You are missing a closing bracket for your Button enum. Therefore, the Swift compiler assumes that let done = ... is part of your enum, which would be a stored property within an enum.

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)
        }
    } // This one is missing
}

Hope that helps :)