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

Answer 1

Actually I use such implementation, it is very convenience for me because of two reason, first one I can use dex value and another all colors in constant

import UIKit

struct ColorPalette {
struct Gray {
    static let Light = UIColor(netHex: 0x595959)
    static let Medium = UIColor(netHex: 0x262626)
}
}

extension UIColor {
convenience init(red: Int, green: Int, blue: Int) {
    assert(red >= 0 && red <= 255, "Invalid red component")
    assert(green >= 0 && green <= 255, "Invalid green component")
    assert(blue >= 0 && blue <= 255, "Invalid blue component")

    self.init(red: CGFloat(red) / 255.0, green: CGFloat(green) / 255.0, blue: CGFloat(blue) / 255.0, alpha: 1.0)
}

convenience init(netHex: Int) {
    self.init(red: (netHex >> 16) & 0xff, green: (netHex >> 8) & 0xff, blue: netHex & 0xff)
}
}

usage

let backgroundGreyColor = ColorPalette.Gray.Medium.cgColor