Swift Category for your custom UIColors

Swift Category for your custom UIColors

import UIKit

extension UIColor
{
	struct dgs
	{
		static let edwardColor: UIColor =
		{
			return UIColor.colorWithHexString("#B1B3B3")!
		}()
	}

	// MARK: - Private

	class private func colorWithHexString(hexString:String) -> UIColor?
	{
		return UIColor.colorWithHex(UIColor.hexForHexString(hexString)!)
	}

	class private func colorWithHex(hex:UInt32) -> UIColor
	{
		return UIColor(red: CGFloat((hex & 0xFF0000)  >> 16) / 255,
					 green: CGFloat((hex & 0xFF00)    >>  8) / 255,
					  blue: CGFloat(hex & 0xFF) / 255,
					 alpha: CGFloat(1.0))
	}

	class private func hexForHexString(hexString:String) -> UInt32?
	{
		let unexpectedHexStringLength: Bool = (hexString.characters.count < 6) || (hexString.characters.count > 8)

		if unexpectedHexStringLength
		{
			assert(false, "Invalid hex format")
			return 0
		}

		let scanner: NSScanner = NSScanner(string: hexString)
		scanner.scanLocation = (hexString.characters.first == "#") ? 1 : 0

		var hex: UInt32 = 0
		if !scanner.scanHexInt(&hex)
		{
			assert(false, "Invalid Hex Format")
			return 0
		}

		return hex
	}
}

Description

Swift extension for the UIColor for adding your custom colors to application.
Every custom color will be lazy initialized just once.

Using

1. Just add your new color to struct dgs like here:

struct dgs
    {
        static let edwardColor: UIColor =
        {
            return UIColor.colorWithHexString("#B1B3B3")!
        }()

        static let yourNewColor: UIColor =
        {
            return UIColor.colorWithHexString("#??????")!
        }()
    }

2. Obtain your color anywhere in your code by calling, for example:

self.view.backgroundColor = UIColor.dgs.yourNewColor