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iOS Swift 2.0 Enumerations and Optionals Introduction to Enumerations Enum Methods

Posted by swiftdev
swiftdev
3,655 Points

Help! I don't understand.

I really don't get this at all but I want to do it myself, so could someone explain it to me?

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)
}
let done = Button.Done("Done")

1 Answer

Matthew Connolly
seal-mask
.a{fill-rule:evenodd;}techdegree
Matthew Connolly
iOS Development Techdegree Student 11,595 Points
Matthew Connolly
.a{fill-rule:evenodd;}techdegree
Matthew Connolly
iOS Development Techdegree Student 11,595 Points

Hi swiftdev,

It looks like you have the correct answer to Task #1. Are you having trouble with Task #2?

Steps:

  1. You need to add a method to Button that will create a UIBarButtonItem
  2. Look to the buttons.swift page to see what arguments you need to create a UIBarButtonItem; you will need a title and a button style (target and action will be nil according to the instructions)
  3. Depending on the enum Button created, use a switch statement to create the respective UIBarButtonItem
  4. Call the method and assign to a constant doneButton 
enum Button {
    case Done(String)
    case Edit(String)

    func toUIBarButtonItem() -> UIBarButtonItem {
        switch self {
        case .Done(/* insert your code */): return UIBarButtonItem(/* insert your code */)
        case .Edit(/* insert your code */): return UIBarButtonItem(/* insert your code */)
        }
    }
}

let done = Button.Done("Done")

let doneButton = done.toUIBarButtonItem()