dirk

extension UIColor {
    enum Error: ErrorType {
        case Parsing(String)
    }

    convenience init(hex input: String) throws {
        let hex = input.stringByTrimmingCharactersInSet(NSCharacterSet.alphanumericCharacterSet().invertedSet)
        var int = UInt32()
        guard NSScanner(string: hex).scanHexInt(&int) else {
            throw Error.Parsing("Unable to scan hexadecimal integer")