How can I change the saturation of an UIImage?

Question

I have an UIImage and want to shift it\'s saturation about +10%. Are there standard methods or functions that can be used for this?

Answer 1

I've just tested Mike Pollard's method and it is correct.

Here is the swift 3 version

let ciimage = CIImage.init(cgImage: self.givenImage.cgImage)
let filter = CIFilter.init(name: "CIColorControls")
filter?.setValue(ciimage, forKey: kCIInputImageKey)
filter?.setValue(0.0, forKey: kCIInputSaturationKey)
let result = filter?.value(forKey: kCIOutputImageKey) as! CIImage
let cgimage = CIContext.init(options: nil).createCGImage(result, from: result.extent)
let image = UIImage.init(cgImage: cgimage!)