UIColor+Hex.swift

extension UIColor {

    convenience init(hex: UInt32, alpha: CGFloat = 1.0) {
        self.init(
            red: CGFloat((hex & 0xff0000) >> 16) / 256.0,
            green: CGFloat((hex & 0x00ff00) >> 8) / 256.0,
            blue: CGFloat(hex & 0x0000ff) / 256.0,
            alpha: alpha
        )
    }

    convenience init(hexString: String, alpha: CGFloat = 1.0) {
        let scanner = NSScanner(string: hexString)
        scanner.charactersToBeSkipped = NSCharacterSet(charactersInString: "#")

        var hex: UInt32 = 0
        scanner.scanHexInt(&hex)

        self.init(hex: hex, alpha: alpha)
    }

}