Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

iOS Intermediate Swift Properties Computed Properties

Posted by Kristopher Valas
Kristopher Valas
1,895 Points

I'm attempting to create a calculated property on an enum

I'm not sure how to tell which value the Text enum is to return the correct text.

enum.swift 
let UIFontTextStyleHeadline = "UIFontTextStyleHeadline"
let UIFontTextStyleBody = "UIFontTextStyleBody"
let UIFontTextStyleFootnote = "UIFontTextStyleFootnote"

enum Text {
  case headline
  case body
  case footnote

  var style : String {
    switch Text{
        case .headline:
        return UIFontTextStyleHeadline
      case .body:
        return UIFontTextStyleBody
      case .footnote:
        return UIFontTextStyleFootnote

    }
  }
}

1 Answer

omarelamrieado
omarelamrieado
18,473 Points

Instead of switching on Text (which is just the name of enum), switch on self: the actual reference of the current enum instance.

let UIFontTextStyleHeadline = "UIFontTextStyleHeadline"
let UIFontTextStyleBody = "UIFontTextStyleBody"
let UIFontTextStyleFootnote = "UIFontTextStyleFootnote"

enum Text {
  case headline
  case body
  case footnote

  var style: String {
    switch self {
        case Text.headline: return UIFontTextStyleHeadline
        case Text.body: return UIFontTextStyleBody
        case Text.footnote: return UIFontTextStyleFootnote
    }
  }
}