Convert a Hex string to UIColor in Swift 1.2

Convert a Hex string to UIColor in Swift

func colorWithHexString (hex: NSString) -> UIColor
{
    var cString: NSString = hex.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet()).uppercaseString
    
    if(count(cString as String) < 6)
    {
        return UIColor.grayColor()
    }
    
    if(cString.hasPrefix("0X"))
    {
        cString = cString.substringFromIndex(advance(0, 2))
    }
    
    if(count(cString as String) != 6)
    {
        return UIColor.grayColor()
    }
    
    var rString = cString.substringWithRange(NSRange(location: 0, length: 2))
    
    var gString = cString.substringWithRange(NSRange(location: 2, length: 2))
    
    var bString = cString.substringWithRange(NSRange(location: 4, length: 2))
    
    var r,g,b: CUnsignedInt
    
    NSScanner(string: rString).scanHexInt(&r)
    NSScanner(string: gString).scanHexInt(&g)
    NSScanner(string: bString).scanHexInt(&b)
    
    return UIColor(red: CGFloat(Float(r) / 255.0), green: CGFloat(Float(g) / 255.0), blue: CGFloat(Float(b) / 255.0), alpha: CGFloat(Float(1)))
}