Eden Color Enum

edencolor.swift

//
//  UIColorExtensions.swift
//  Eden
//
//  Created by Maximilian Alexander on 9/18/15.
//  Copyright © 2015 Epoque. All rights reserved.
//

import UIKit

extension UIColor {
    public convenience init(rgba: String) {
        var red:   CGFloat = 0.0
        var green: CGFloat = 0.0
        var blue:  CGFloat = 0.0
        var alpha: CGFloat = 1.0
        
        if rgba.hasPrefix("#") {
            let index   = rgba.startIndex.advancedBy(1)
            let hex     = rgba.substringFromIndex(index)
            let scanner = NSScanner(string: hex)
            var hexValue: CUnsignedLongLong = 0
            if scanner.scanHexLongLong(&hexValue) {
                switch (hex.characters.count) {
                case 3:
                    red   = CGFloat((hexValue & 0xF00) >> 8)       / 15.0
                    green = CGFloat((hexValue & 0x0F0) >> 4)       / 15.0
                    blue  = CGFloat(hexValue & 0x00F)              / 15.0
                case 4:
                    red   = CGFloat((hexValue & 0xF000) >> 12)     / 15.0
                    green = CGFloat((hexValue & 0x0F00) >> 8)      / 15.0
                    blue  = CGFloat((hexValue & 0x00F0) >> 4)      / 15.0
                    alpha = CGFloat(hexValue & 0x000F)             / 15.0
                case 6:
                    red   = CGFloat((hexValue & 0xFF0000) >> 16)   / 255.0
                    green = CGFloat((hexValue & 0x00FF00) >> 8)    / 255.0
                    blue  = CGFloat(hexValue & 0x0000FF)           / 255.0
                case 8:
                    red   = CGFloat((hexValue & 0xFF000000) >> 24) / 255.0
                    green = CGFloat((hexValue & 0x00FF0000) >> 16) / 255.0
                    blue  = CGFloat((hexValue & 0x0000FF00) >> 8)  / 255.0
                    alpha = CGFloat(hexValue & 0x000000FF)         / 255.0
                default:
                    print("Invalid RGB string, number of characters after '#' should be either 3, 4, 6 or 8", terminator: "")
                }
            } else {
                print("Scan hex error")
            }
        } else {
            print("Invalid RGB string, missing '#' as prefix", terminator: "")
        }
        self.init(red:red, green:green, blue:blue, alpha:alpha)
    }
}

enum EdenColor : CustomStringConvertible{
    
    case RedLighter;
    case RedDarker;
    case OrangeLighter;
    case OrangeDarker;
    case GreenLighter;
    case GreenDarker;
    case BlueLighter;
    case BlueDarker;
    case BlueLogo;
    case PurpleDarker;
    case PurpleLighter;
    case DarkBackground;
    
    var description : String {
        switch self {
        case .RedLighter: return "#DC5563"
        case .RedDarker: return "#C64C57"
        case .OrangeDarker: return "#FA9D4D"
        case .OrangeLighter: return "#E18D44"
        case .GreenDarker: return "#044C29"
        case .GreenLighter: return "#45BF55"
        case .BlueDarker: return "#2E59A9"
        case .BlueLighter: return "#37A8E0"
        case .BlueLogo: return "#3382C5"
        case .PurpleDarker: return "#8153BF"
        case .PurpleLighter: return "#8E5CD5"
        case .DarkBackground: return "#263238"
        }
    }
    
    var color: UIColor {
        return UIColor(rgba: self.description)
    }
}