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iOS Swift 2.0 Enumerations and Optionals Introduction to Enumerations Enum Methods

Trevor Wood
Trevor Wood
17,828 Points
Posted by Trevor Wood
Trevor Wood
17,828 Points

I have no idea whats going on here

I'm pretty lost here. Can someone explain this code challenge question to me as if I were a small child?

Also, what is the end goal of this challenge? What are we trying to achieve with this code?

Thanks in advance for whomever answers :)

buttons.swift 
import Foundation

enum UIBarButtonStyle {
    case Done
    case Plain
    case Bordered
}

class UIBarButtonItem {

    var title: String?
    let style: UIBarButtonStyle
    var target: AnyObject?
    var action: Selector

    init(title: String?, style: UIBarButtonStyle, target: AnyObject?, action: Selector) {
        self.title = title
        self.style = style
        self.target = target
        self.action = action
    }
}
enums.swift 
enum Button {
    case Done(String)
    case Edit(String)

    func toUIBarButtonItem() -> UIBarButtonItem{

    }
}

let done = Button.Done("Done")

let doneButton = Button.Done("Done")

2 Answers

Eric Hodgins
Eric Hodgins
29,207 Points
Eric Hodgins
Eric Hodgins
29,207 Points

From the big picture this challenge I think is trying to show you how powerful Swift enums are. This task specifically is trying to accomplish a way to make a UIBarButtonItem easily through an enum method.

Looks like you got the first part of the challenge. But this is how I accomplished the second part:

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

    func toUIBarButtonItem() -> 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 = Button.Done("Done")
let doneButton = done.toUIBarButtonItem()

With that func in the enum you can now easily make a UIBarButtonItem from any other Button enums that you make. Whether they're case Done or Edit...or any other custom cases made. Does that all make sense? If anythings unclear feel free to ask!

Ryan Doyle
Ryan Doyle
8,587 Points
Ryan Doyle
Ryan Doyle
8,587 Points

That was so helpful! This took me so long to figure out just because I kept trying to figure out that in the world anything was actually making in the first place. I think once the challenges get this complex, it's much more helpful to know what's actually going on. Had the instruction just stated that the code was to take a IUButton and make it more friendly by converting it to an easier named Enum, this would have been so much easier. It also kind of relies on the fact that you'll just assume the string is a title.

psculthorpe
psculthorpe
3,151 Points

Totally agree - I feel like a simple and less abstract explanation of the problem would have made me attempt to tackle it in a different way - thanks Eric Hodgins :)