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iOS Enumerations and Optionals in Swift Introduction to Enumerations Enum Methods

Arius Eich
Arius Eich
2,769 Points
Posted by Arius Eich
Arius Eich
2,769 Points

Help please

I have been stuck on this challenge for a while. Please help. Thank you!

buttons.swift 
// Example of UIBarButtonItem instance
// let someButton = UIBarButtonItem(title: "A Title", style: .plain, target: nil, action: nil)
//import UIKit
enum BarButton {
    case done(title: String)
    case edit(title: String)

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


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

1 Answer

Everton Carneiro
Everton Carneiro
15,994 Points
Everton Carneiro
Everton Carneiro
15,994 Points

Hello mate. You need to pay attention in the instructions of the challenge. There's a couple of errors in your code:

  • 1 : You don't need to specify the title in the switch statement, just the case itself. The correct syntax is:
        switch self {
        case .done:
           //code here
        case .edit:
           //code here
        }
  • 2 : In the challenge you are asked to return an instance of UIBarbutton as the comments they've provide, your syntax also is incorrect in this part:
   return .done(title: "/(title)", style: .plain, target: nil, action: nil)
  • 3: To call the method, you need to use the instance of BarButton that you create, with should be: 
let done = BarButton.done(title: "Save")
let button = done.button()

instead of:

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

The compiler doesn't recognize button.done because you've never created an instance called button, you create an instance called done.

The right final version look like this:

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

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

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

I hope that helps.