How can I make a Swift enum with UIColor value?

Question

I'm making a drawing app and I would like to refer to my colors through use of an enum. For example, it would be cleaner and more convenient to use Colors.RedColor instead of typing out values every time I want that red color. However, Swift's raw value enums don't seem to accept UIColor as a type. Is there a way to do this with an enum or something similar?

Answer 1

I do it like this (basically using a struct as a namespace):

extension UIColor {   struct MyTheme {     static var firstColor: UIColor  { return UIColor(red: 1, green: 0, blue: 0, alpha: 1) }     static var secondColor: UIColor { return UIColor(red: 0, green: 1, blue: 0, alpha: 1) }   } } 

And you use it like:

UIColor.MyTheme.firstColor 

So you can have a red color inside your custom theme.

Answer 2

If your color isn't one of those defined by UIColor's convenience method, you can add an extension to UIColor:

extension UIColor {     static var firstColor: UIColor  { return UIColor(red: 1, green: 0, blue: 0, alpha: 1) }     static var secondColor: UIColor { return UIColor(red: 0, green: 1, blue: 0, alpha: 1) } }  // Usage let myColor = UIColor.firstColor