I need help with an Assignment. This is killing me...

Question

So when I try and run the code i get swift_lint.swift:33:57: error: use of unresolved identifier 'UIBarButtonItemStyle' return UIBarButtonItem(title: title, style: UIBarButtonItemStyle.Done, target: nil, action: nil) ^ swift_lint.swift:35:57: error: use of unresolved identifier 'UIBarButtonItemStyle' return UIBarButtonItem(title: title, style: UIBarButtonItemStyle.Plain, target: nil, action: nil)

Then when i import UIKit i get swift_lint.swift:24:8: error: no such module 'UIKit' import UIKit

To the button enum, add a method named toUIBarButtonItem that returns an instance of UIBarButton item configured properly.

In the buttons.swift file there is a basic implementation of UIBarButtonItem. You can create buttons with three different styles and titles.

Using the associated values as titles for the button, return a button with style UIBarButtonStyle.Done for the Done member of the Button enum. Similarly for the Edit member, return a UIBarButtonItem instance with the style set to UIBarButtonStyle.Plain.

In both cases you can pass nil for target and action. Once you have a method, call it on the value we created in the previous task and assign it to a constant named doneButton.

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

import UIKit

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

    func toUIBarButtonItem() ->UIBarButtonItem {

        switch self {

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


}

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

Answer 1 · 2016-04-12T04:36:19Z

April 12, 2016 4:36am

Hey Ryan Breece,

You're so close! You just have to make two changes:

First, you need your second case in the switch statement, Edit, to return a UIBarButtonItem with a style of .Plain. You are returning one with .Done.

Second, you need to call the toUIBarButtonItem() instance method you created on the done constant you created in the previous challenge. You then assign the value returned to a constant called doneButton.

As a general rule, don't edit the code that the previous challenge requires to pass.

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

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

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

Good Luck!

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Ryan Breece

Ryan Breece

I need help with an Assignment. This is killing me...

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Steven Deutsch

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Ryan Breece

Ryan Breece