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iOS Enumerations and Optionals in Swift Introduction to Enumerations Enum Methods

Lana Wong
Lana Wong
3,968 Points

Am I creating the method right? How do I call it on a value?

INSTRUCTIONS: Next, add a method to the enum named button that returns an instance of the class UIBarButtonItem configured properly. An example of how to create an instance for this task is shown in the comments below. Use the same initializer.

In the method, using the associated values as titles for the button, 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.

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 button.

QUESTION: What am I doing wrong? I would really appreciate if someone helped me. :)

Lana

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() -> someButton{
  switch self{
    case .done: return someButton(title: "A Title", style: UIBarButtonStyle.done, target: nil, action: nil)
    case .edit: return someButton(title: "A Title", style: UIBarButtonStyle.plain, target: nil, action: nil)

}
}

}

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

2 Answers

Jeff McDivitt
Jeff McDivitt
23,970 Points

Hi Lana - The method is incorrect you need to return UIBarButtonItem, also check the last line of your code. Please let me know if I can assist further

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

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

}
let done = BarButton.done(title: "Save")
let button = done.button()
Lana Wong
Lana Wong
3,968 Points

That makes a whole lot more sense. Thank you so much!

Jeff McDivitt
Jeff McDivitt
23,970 Points

You are welcome! Happy Coding!!