colors.stencil

import UIKit

extension UIColor {
  convenience init(rgbaValue: UInt32) {
    let red   = CGFloat((rgbaValue >> 24) & 0xff) / 255.0
    let green = CGFloat((rgbaValue >> 16) & 0xff) / 255.0
    let blue  = CGFloat((rgbaValue >>  8) & 0xff) / 255.0
    let alpha = CGFloat((rgbaValue      ) & 0xff) / 255.0

    self.init(red: red, green: green, blue: blue, alpha: alpha)
  }
}

extension UIColor {

  enum {{enumName}} {
    {% for color in colors %}
    case {{color.name}}
    {% endfor %}

    var colorValue: UInt32 {
      switch self {
        {% for color in colors %}
        case {{color.name}}:
          return 0x{{color.hex}}
        {% endfor %}
      }
    }
  }

  convenience init(named name: {{enumName}}) {
    self.init(rgbaValue: name.colorValue)
  }
}

Support colors with same code

I think using a Dictionary<String,String> to do the lookup instead of a huge switch/case could improve performance (especially for people having tons of colors to generate)

BTW, we should use {{color.name|swift_identifier}} there (just realized I made the same mistake in my own template bundled with SwiftGen)