How to get the pixel color on touch?

Question

I know this is a common question and there are a lot of answers of this question. I\'ve used some of this. Although many of them are the same. But the sad thing for me is th

Answer 1

Swift 4, Xcode 9 - With a UIImageView Extension

This is a combination of all of the answers above but in an extension

extension UIImageView {
    func getPixelColorAt(point:CGPoint) -> UIColor{
        
        let pixel = UnsafeMutablePointer.allocate(capacity: 4)
        let colorSpace = CGColorSpaceCreateDeviceRGB()
        let bitmapInfo = CGBitmapInfo(rawValue: CGImageAlphaInfo.premultipliedLast.rawValue)
        let context = CGContext(data: pixel, width: 1, height: 1, bitsPerComponent: 8, bytesPerRow: 4, space: colorSpace, bitmapInfo: bitmapInfo.rawValue)
        
        context!.translateBy(x: -point.x, y: -point.y)
        layer.render(in: context!)
        let color:UIColor = UIColor(red: CGFloat(pixel[0])/255.0,
                                    green: CGFloat(pixel[1])/255.0,
                                    blue: CGFloat(pixel[2])/255.0,
                                    alpha: CGFloat(pixel[3])/255.0)
        
        pixel.deallocate(capacity: 4)
        return color
    }
}

How to use

override func touchesBegan(_ touches: Set, with event: UIEvent?) {
    let touch = touches.first
    if let point = touch?.location(in: view) {
        let color = myUIImageView.getPixelColorAt(point: point)
        print(color)
    }
}