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

Great answer rdelmar this helped me A LOT!

Here is how I did the above in Swift:

override func touchesBegan(touches: NSSet, withEvent event: UIEvent)
    {
        var touch:UITouch = event.allTouches()!.anyObject() as UITouch
        var loc = touch.locationInView(self)
        var color:UIColor = getPixelColorAtPoint(loc)
        println(color)
    }

    //returns the color data of the pixel at the currently selected point
    func getPixelColorAtPoint(point:CGPoint)->UIColor
    {
        let pixel = UnsafeMutablePointer.alloc(4)
        var colorSpace = CGColorSpaceCreateDeviceRGB()
        let bitmapInfo = CGBitmapInfo(CGImageAlphaInfo.PremultipliedLast.rawValue)
        let context = CGBitmapContextCreate(pixel, 1, 1, 8, 4, colorSpace, bitmapInfo)

        CGContextTranslateCTM(context, -point.x, -point.y)
        layer.renderInContext(context)
        var 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.dealloc(4)
        return color
    }