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iOS Enumerations and Optionals in Swift Introduction to Enumerations Enum Methods

Jonathan Holland
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.a{fill-rule:evenodd;}techdegree
Jonathan Holland
iOS Development Techdegree Student 4,037 Points

I don't see the comments that show the initializer....

I'm not sure what is meant by the last statement in the challenge. Running the method on the previous constant then assigning the value to a new constant named "button"

buttons.swift
// Example of UIBarButtonItem instance
// let someButton = UIBarButtonItem(title: "A Title", style: .plain, target: nil, action: nil)

enum BarButton {
    case done(title: String)
    case edit(title: String)

    func button() -> UIBarButtonItem {
    switch self {
    case .done(let dvalue): return UIBarButtonItem(title: dvalue, style: UIBarButtonStyle.done, target: nil, action: nil)
    case .edit(let evalue): return UIBarButtonItem(title: evalue, style: UIBarButtonStyle.plain, target: nil, action: nil)
    }
    }
}

let done = BarButton.done(title: "Save")
let button = done.button()

1 Answer

Royce Pollard
Royce Pollard
24,267 Points

The returned value's "style" is not of UIBarButtonItem. But that of BarButton itself.

enum BarButton { case done(title: String) case edit(title: String)

func button() -> UIBarButtonItem {
switch self {
case .done(let dvalue): return UIBarButtonItem(title: dvalue, style: .done, target: nil, action: nil)
case .edit(let evalue): return UIBarButtonItem(title: evalue, style: .plain, target: nil, action: nil)
}

}

Jonathan Holland
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.a{fill-rule:evenodd;}techdegree
Jonathan Holland
iOS Development Techdegree Student 4,037 Points

Ok, but the instructions clearly say: "return a button with style UIBarButtonStyle.done for the done member of the BarButton enum" & "Similarly for the edit member, return a UIBarButtonItem instance with the style set to UIBarButtonStyle.plain."

I didn't think it would know .done is UIBarButtonStyle.done

thanks for help. I finally got passed it :)