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iOS

s t
s t
2,699 Points
Posted by s t
s t
2,699 Points

enum method objective

My code passed in the Treehouse compiler but has errors in xcode:

// 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 edit = BarButton.edit(title: "Save")

The error message I am getting is " Type UIBarButtonItemStyle has no member 'done'" and " Type UIBarButtonItemStyle has no member 'plain' "

Does anyone know why?

4 Answers

Arman Arutyunov
Arman Arutyunov
21,900 Points
Arman Arutyunov
Arman Arutyunov
21,900 Points 
// 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()
Arman Arutyunov
Arman Arutyunov
21,900 Points
Arman Arutyunov
Arman Arutyunov
21,900 Points

I've put your code to the playground and there are actually no errors. Just a couple of warnings saying you declared variables that were never used. Compiler is talking about this 

let title

inside 

case .done(let title):

and 

case .edit(let title):

Let's deal with it by actually using those constants inside the case return so you don't hardcode the value of a button title but put there anything declared in the process of instantiating.

The full snippet:

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 edit = BarButton.edit(title: "Save")

Feel free to ask if there are any more questions

s t
s t
2,699 Points
s t
s t
2,699 Points

Thanks but actually I was mistaken, I still did not pass the objective with just this code. What am I missing?

Arman Arutyunov
Arman Arutyunov
21,900 Points
Arman Arutyunov
Arman Arutyunov
21,900 Points

And hey, I'm trying to help you. Minusing my first answer wasn't really necessary

Arman Arutyunov
Arman Arutyunov
21,900 Points
Arman Arutyunov
Arman Arutyunov
21,900 Points

That's really odd. But try calling .done and .plain through UIBarButtonItemStyle like this

case .done(let title):
            return UIBarButtonItem(title: title, style: UIBarButtonItemStyle.done, target: nil, action: nil)
case .edit(let title):
            return UIBarButtonItem(title: title, style: UIBarButtonItemStyle.plain, target: nil, action: nil)