UIColor に HEX を受け渡せるようにする拡張

extension UIColor {

    convenience init(hex: Int, alpha: CGFloat) {
        let r = CGFloat((hex & 0xFF0000) >> 16) / 255.0
        let g = CGFloat((hex & 0x00FF00) >> 8) / 255.0
        let b = CGFloat(hex & 0x0000FF) / 255.0
        self.init(red: r, green: g, blue: b, alpha: alpha)
    }

    convenience init(hexString str: String, alpha: CGFloat) {
        let range = NSMakeRange(0, countElements(str))
        let hex = (str as NSString).stringByReplacingOccurrencesOfString("[^0-9a-fA-F]", withString: "", options: NSStringCompareOptions.RegularExpressionSearch, range: range)
        var color: UInt32 = 0
        NSScanner(string: hex).scanHexInt(&color)
        self.init(hex: Int(color), alpha: alpha)
    }

}

以下のように利用します。

UIColor(hex: 0xEEEEEE, alpha: 1)