Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS Swift 2.0 Enumerations and Optionals Introduction to Enumerations Enum Methods

Yuanzheng Wen
PLUS
Yuanzheng Wen
Courses Plus Student 1,756 Points
Posted by Yuanzheng Wen
Yuanzheng Wen
Courses Plus Student 1,756 Points

no compiler errors

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

}

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 desc): return UIBarButtonItem(title: desc, style: .Done, target: nil, action: nil)
        case Edit(let desc): return UIBarButtonItem(title: desc, style: .Plain, target: nil, action: nil)
      }
    }

}

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

1 Answer

Steven Deutsch
Steven Deutsch
21,046 Points
Steven Deutsch
Steven Deutsch
21,046 Points

Hey Yuanzheng Wen,

The problem is that the code challenge wants you to call this method on the item you created in the previous task. It wants you to call toUIBarButtonItem() on the done constant that you set to Button.Done("Done"). If this wasn't specifically what the challenge was checking for, your code would be fine. 

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

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

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

Good Luck!