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iOS Swift 2.0 Enumerations and Optionals Introduction to Enumerations Enum Methods

Jason Teo
PLUS
Jason Teo
Courses Plus Student 8,398 Points
Posted by Jason Teo
Jason Teo
Courses Plus Student 8,398 Points

How do I solve this question?

How do I correctly pass the associated value of .Done?

3 Answers

Ritesh R
PLUS
Ritesh R
Courses Plus Student 17,865 Points
Ritesh R
Ritesh R
Courses Plus Student 17,865 Points

Try this code..

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

    func toUIBarButtonItem() -> UIBarButtonItem {
        switch self {

        case .Done: return UIBarButtonItem(title: "Done", style: UIBarButtonItemStyle.Done, target: nil, action: nil)

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

    }

}

let done = Button.Done("Done")
let doneButton = done.toUIBarButtonItem()
johnhenri
johnhenri
42,259 Points
johnhenri
johnhenri
42,259 Points

The correct code is:

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

    func toUIBarButtonItem() -> UIBarButtonItem {
        switch self {

        case Done: return UIBarButtonItem(title: "Done", style: UIBarButtonStyle.Done, target: nil, action: nil)

        case Edit: return UIBarButtonItem(title: "Plain", style: UIBarButtonStyle.Plain, target: nil, action: nil)
        }

    }

}

let done = Button.Done("Done")
let doneButton = done.toUIBarButtonItem()
Marina Alenskaja
Marina Alenskaja
9,320 Points
Marina Alenskaja
Marina Alenskaja
9,320 Points

Why did you change the associated values to optionals? In the challenge, it's written as: case Done(String).

johnhenri
johnhenri
42,259 Points

I was correcting Ritesh R's code where he was using optional. The correct code without switching associated values is :

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

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

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

both methods work with the latter being the most correct.

Ritesh R
PLUS
Ritesh R
Courses Plus Student 17,865 Points
Ritesh R
Ritesh R
Courses Plus Student 17,865 Points

I was trying the code challenge in a playground & after the optional course i just put it there just in case, as it was getting difficult to complete the challenge. Thanks @johnhenri

johnhenri
johnhenri
42,259 Points

anytime Ritesh R