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iOS Enumerations and Optionals in Swift Introduction to Enumerations Enum Methods

This code works in xcode - in treehouse it says I need to assign a result to doneButton. Preview has no errors.

I don't understand why this works in xcode (I have to add import UIKit -- but treehouse throws an error when I import UIKit) . When I click on preview I get no additional information nor errors.

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

enum Button {
    case done(String)
    case edit(String)

    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)
        }
    }
}

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

2 Answers

Hi Bill Tihen,

You're almost there, you forgot one small part, you are inputting the title as a fixed value, but this is of course variable depending on what the user gives it. So it should be case .done(let title): instead of: case .done:. Also doneButton needs to be defined as button.

See complete code below:

// 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 title):
            return UIBarButtonItem(title: title, style: .done, 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()

I hope this helped!


sig

Thanks - this passes. I guess there are unit tests not just a compiler. . It would be nice to get the test feedback