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iOS Enumerations and Optionals in Swift Introduction to Enumerations Enum Methods

William Humphrey
William Humphrey
5,543 Points
Posted by William Humphrey
William Humphrey
5,543 Points

whats missing in this?

I have made 3 errors I can't find please help.

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)
}
class UIBarButtonItem {
    var title: String
    let style: UIBarButtonItemStyle
    var target: nil
    var action: nil

    init (title: String, style: UIBarButtonItemStyle, target: nil, action: nil){

    self.title = title
    self.style = style
    self.target = target
    self.action = action

    }
}
enum Button {
    case Done(String)
    case Edit(String)

    func toUIBarButtonItem() -> UIBarButtonItem {
        switch self{
        case .Done(let title): UIBarButtonItem(title: title, style: UIBarButtonItemStyle.Done, target: nil, action: nil)
        case .Edit(let title): UIBarButtonItem(title: title, style: UIBarButtonItemStyle.Done, target: nil, action: nil)
        }
    }
}

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

2 Answers

Jonathan Ruiz
Jonathan Ruiz
2,998 Points
Jonathan Ruiz
Jonathan Ruiz
2,998 Points

Hi William, there are a couple things missing and some stuff that didn't need to be written. You don't have to make a class for UIBarButtonItem and the enum you made for button is supposed to be a function inside the enum they provided for you. Anytime a problem refers to a method what they mean is a function inside of an object like an enum, struct, or class. So when you say to create a method named button what they mean is a specialized function in the enum they provided for you. The function you made at the bottom has the right idea its just missing one thing. Every time you write a function when you return a type you must return that type inside the function. When writing a switch statement this will be after you have written your case. I have the solution below.

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)
        }
         // after we write the case we return the UIBarButtonItem and this satisfies the return type at the end of our function 

    }
}

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

Hope this helps

William Humphrey
William Humphrey
5,543 Points
William Humphrey
William Humphrey
5,543 Points

Thank you that makes more sense now