CodableColor.swift

public struct CodableColor: Codable {
	public var red: CGFloat = 0
	public var green: CGFloat = 0
	public var blue: CGFloat = 0
	public var alpha: CGFloat = 1.0
	public var colorSpace: String

	init(cgColor color: CGColor) {
		let comps = color.components!
		red = comps[0]
		green = comps[1]
		blue = comps[2]

		if let name = color.colorSpace?.name {
			colorSpace = name as String
		} else {
			colorSpace = CGColorSpace.extendedSRGB as String
		}

		if color.numberOfComponents == 4 {
			alpha = comps[3]
		}
	}

	var components: [CGFloat] {
		return [red, green, blue, alpha]
	}
}

usage.swift

let decoded = ...		
let color = CGColor(colorSpace: decoded.colorSpace, components: decoded.components)