CODEWITHSUNDEEP
xcodeswift
Snowman
Snowman

Reputation: 32071

Xcode 6 runtime attributes with Swift enums

I have a class in Swift called Button:

enum ButtonBackgroundColor {
    case None
    case Yellow
}

class Button: UIButton {
    var backgroundColorType: ButtonBackgroundColor?
}

And then I'm setting a runtime attribute:

enter image description here

However, I get a non-descriptive crash. The stack trace mentions something about key value coding.

Runtime attributes do work however for non enum types, like Int or Float:

// runtime attributes work for this
var backgroundColorType: Int = 0

Is there something wrong with the way I'm declaring my enum?

Upvotes: 1

Views: 670

Answers (2)

pixelfreak
pixelfreak

Reputation: 17834

@GoZoner's answer didn't work for me. Tried changing the raw type to String and that didn't work as well. My solution is to define another variable (of whichever type supported by the runtime attributes) and then override the didSet of that variable to set the enum.

So in code:

var IBButtonBackgroundColor = "None"
{
    didSet
    {
        switch self.IBButtonBackgroundColor
        {
            case "None":
                self.backgroundColorType = .None
                break

            case "Yellow":
                self.backgroundColorType = .Yellow
                break
            default:
                self.backgroundColorType = .None
                break
        }
    }
}
var backgroundColorType:ButtonBackgroundColor = .None

I don't like having to repeat things in the switch/case, but I can't think of any better solution for now.

Upvotes: 0

GoZoner
GoZoner

Reputation: 70165

Given that your enum ButtonBackgroundColor includes a .None case, why not avoid declaring backgroundColorType in Button as an optional? Doing so needlessly complicates the declaration. Prefer

class Button: UIButton {
  var backgroundColorType = ButtonBackgroundColor.None
}

Besides being more idiomatically correct, the above might, just might, fix your 'user defined attribute' issue now that the variable is not an optional.

You also might need to provide raw values in your enum. Like:

enum ButtonBackgroundColor : Int {
  case None = 0
  case Yellow = 1
}

if you expect the runtime attribute value of '0' to perhaps map to .None

Upvotes: 1

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