Swift UIColor Utils

UIColorUtils.swift

extension UIColor {
  
    public convenience init(hex: String) {
        let characterSet = NSCharacterSet.whitespaceAndNewlineCharacterSet().mutableCopy() as! NSMutableCharacterSet
        characterSet.formUnionWithCharacterSet(NSCharacterSet(charactersInString: "#"))
        let cString = hex.stringByTrimmingCharactersInSet(characterSet).uppercaseString
        if (cString.characters.count != 6) {
            self.init(white: 1.0, alpha: 1.0)
        } else {
            var rgbValue: UInt32 = 0
            NSScanner(string: cString).scanHexInt(&rgbValue)
            
            self.init(red: CGFloat((rgbValue & 0xFF0000) >> 16) / 255.0,
                      green: CGFloat((rgbValue & 0x00FF00) >> 8) / 255.0,
                      blue: CGFloat(rgbValue & 0x0000FF) / 255.0,
                      alpha: CGFloat(1.0))
        }
    }
    
    public convenience init(hex: UInt32, alpha: CGFloat) {
        let red = CGFloat((hex & 0xFF0000) >> 16)/256.0
        let green = CGFloat((hex & 0xFF00) >> 8)/256.0
        let blue = CGFloat(hex & 0xFF)/256.0
        
        self.init(red: red, green: green, blue: blue, alpha: alpha)
    }
    
    public convenience init(red: Int, green: Int, blue: Int) {
        let newRed = CGFloat(red) / 255
        let newGreen = CGFloat(green) / 255
        let newBlue = CGFloat(blue) / 255
        
        self.init(red: newRed,green: newGreen, blue: newBlue, alpha: 1.0)
    }
}