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iOS Swift 2.0 Enumerations and Optionals Introduction to Enumerations Enum Methods

Not sure what this error means - works in Playground. (Error: Enums may not contain stored properties)

Not entirely sure why this is throwing an error.

Should I be doing this instead:

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

        }


}

let done = Button.Done("Done")

let doneButton = done.toUIBarButtonItem()

1 Answer

Nathan Tallack
Nathan Tallack
22,158 Points

Yeah, this one caught me out too.

You are not closing your enum. See you have a brace opening the enum, then another opening the function, then another opening the switch.

Then you got one closing the switch but not closing the function. As a result the compiler is seeing your two let statements as part of your enum.

Don't faceplam too hard. We all make this mistake quite often. Pay attention to your indenting. You can see you are going back two levels. That should draw your attention in the future. ;)

Keep up the great work! :)

Ross Landry
Ross Landry
8,058 Points

Thanks Nathan. I had the same problem and this solution was a great relief!