dhavaln · September 4, 2015 10:13 · Sep 4, 2015
diff --git a/ViewController.swift b/ViewController.swift
@@ -0,0 +1,37 @@
+func extractColor(image: UIImage){
+  let pixel = UnsafeMutablePointer<CUnsignedChar>.alloc(4)
+  let colorSpace:CGColorSpace = CGColorSpaceCreateDeviceRGB()
+  let bitmapInfo = CGBitmapInfo(CGImageAlphaInfo.PremultipliedLast.rawValue)
+  let context = CGBitmapContextCreate(pixel, 1, 1, 8, 4, colorSpace, bitmapInfo)
+  CGContextDrawImage(context, CGRectMake(0, 0, 1, 1), image.CGImage)
+
+  var color: UIColor? = nil
+
+  if pixel[3] > 0 {
+      var alpha:CGFloat = CGFloat(pixel[3]) / 255.0
+      var multiplier:CGFloat = alpha / 255.0
+
+      color = UIColor(red: CGFloat(pixel[0]) * multiplier, green: CGFloat(pixel[1]) * multiplier, blue: CGFloat(pixel[2]) * multiplier, alpha: alpha)
+  }else{
+
+      color = 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)
+  }
+
+  if color != nil {
+      println( self.toHexString(color!) )
+  }
+  pixel.dealloc(4)
+}
+
+func toHexString(color: UIColor) -> String {
+  var r:CGFloat = 0
+  var g:CGFloat = 0
+  var b:CGFloat = 0
+  var a:CGFloat = 0
+
+  color.getRed(&r, green: &g, blue: &b, alpha: &a)
+
+  let rgb:Int = (Int)(r*255)<<16 | (Int)(g*255)<<8 | (Int)(b*255)<<0
+
+  return String(format:"#%06x", rgb)
+}