How to get the RGB Code (INT) from an UIColor in Swift [duplicate]

The Java getRGB()returns an integer representing the color in the default sRGB color space (bits 24-31 are alpha, 16-23 are red, 8-15 are green, 0-7 are blue).

UIColor does not have such a method, but you can define your own:

extension UIColor {    func rgb() -> Int? {        var fRed : CGFloat = 0        var fGreen : CGFloat = 0        var fBlue : CGFloat = 0        var fAlpha: CGFloat = 0        if self.getRed(&fRed, green: &fGreen, blue: &fBlue, alpha: &fAlpha) {            let iRed = Int(fRed * 255.0)            let iGreen = Int(fGreen * 255.0)            let iBlue = Int(fBlue * 255.0)            let iAlpha = Int(fAlpha * 255.0)            //  (Bits 24-31 are alpha, 16-23 are red, 8-15 are green, 0-7 are blue).            let rgb = (iAlpha << 24) + (iRed << 16) + (iGreen << 8) + iBlue            return rgb        } else {            // Could not extract RGBA components:            return nil        }    }}

Usage:

let swiftColor = UIColor(red: 1, green: 165/255, blue: 0, alpha: 1)if let rgb = swiftColor.rgb() {    print(rgb)} else {    print("conversion failed")}

Note that this will only work if the UIColor has been defined in an"RGB-compatible" colorspace (such as RGB, HSB or GrayScale). It mayfail if the color has been created from an CIColor or a patternimage, in that case nil is returned.

Remark: As @vonox7 noticed, the returned value can be negativeon 32-bit platforms (which is also the case with the Java getRGB() method).If that is not wanted, replace Int by UInt or Int64.

The reverse conversion is

extension UIColor {    convenience init(rgb: Int) {        let iBlue = rgb & 0xFF        let iGreen =  (rgb >> 8) & 0xFF        let iRed =  (rgb >> 16) & 0xFF        let iAlpha =  (rgb >> 24) & 0xFF        self.init(red: CGFloat(iRed)/255, green: CGFloat(iGreen)/255,                  blue: CGFloat(iBlue)/255, alpha: CGFloat(iAlpha)/255)    }}

From Martin R's answer :The method could also return a named tuple (a Swift 2 feature):

extension UIColor {    func rgb() -> (red:Int, green:Int, blue:Int, alpha:Int)? {        var fRed : CGFloat = 0        var fGreen : CGFloat = 0        var fBlue : CGFloat = 0        var fAlpha: CGFloat = 0        if self.getRed(&fRed, green: &fGreen, blue: &fBlue, alpha: &fAlpha) {            let iRed = Int(fRed * 255.0)            let iGreen = Int(fGreen * 255.0)            let iBlue = Int(fBlue * 255.0)            let iAlpha = Int(fAlpha * 255.0)            return (red:iRed, green:iGreen, blue:iBlue, alpha:iAlpha)        } else {            // Could not extract RGBA components:            return nil        }    }}

Swift 3.0 IOS 10

let colour = UIColor.redlet rgbColour = colour.cgColorlet rgbColours = rgbColour.components