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iOS Enumerations and Optionals in Swift Introduction to Enumerations Enum Methods

Sayuri Katz
Sayuri Katz
6,148 Points

Next, add a method to the enum named button that returns an instance of the class UIBarButtonItem configured properly.

Need help!

`

1 Answer

Dan Lindsay
Dan Lindsay
39,611 Points

Hey Sayuri,

Let me see if I can help on this one. First, the challenge asks you to create a method named button, and you have named yours BarButtonItem. So let’s first create the method stubbing our enum, like so:

func button()  -> UIBarButtonItem {

}

For the next part, we need to create a switch statement on our two cases, done and edit. Since these are inside our enum, we need to switch on self. This will look like this:

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

See that in our switch statement, we just use the associated values(.done, .edit) so we don’t have to worry about the (title: String) bit. Now that we have our method, we just need to call it on our done constant and store that value in a new constant called button, like so:

let done = BarButton.done(title: Save) //this was from task 1
let button = done.button()

This should pass the challenge, once you delete the switch statement you declared outside the enum as well. Hope this helps you out!

Dan