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iOS Swift 2.0 Enumerations and Optionals Introduction to Enumerations Enum Methods

Shotaro Hariu
Shotaro Hariu
2,684 Points
Posted by Shotaro Hariu
Shotaro Hariu
2,684 Points

I don't understand why I'm still getting it wrong

To the button enum, add a method named toUIBarButtonItem that returns an instance of UIBarButtonItem 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 
enum Button {
    case Done(String)
    case Edit(String)
}
func toUIBarButtonItem() -> UIBarButtonItem {
        switch self {
        case .Done(let String):
            return UIBarButtonItem(title: String, style: UIBarButtonStyle.Done, target: nil, action: nil)
        case .Edit(let String):
            return UIBarButtonItem(title: String, style: UIBarButtonStyle.Plain, target: nil, action: nil)

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

1 Answer

Handy Metellus
Handy Metellus
7,796 Points
Handy Metellus
Handy Metellus
7,796 Points

Try this

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

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

}

}

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