Image Colouring in ObjC

+ (UIImage*)imageNamed:(NSString*)imgName withColor: (UIColor*)color {
  // load the image
  UIImage *img = [UIImage imageNamed:imgName];
 
  // begin a new image context, to draw our colored image onto
  UIGraphicsBeginImageContext(img.size);
 
  // get a reference to that context we created
  CGContextRef context = UIGraphicsGetCurrentContext();
 
  // set the fill color
  [color setFill];
 
  // translate/flip the graphics context (for transforming from CG* coords to UI* coords
  CGContextTranslateCTM(context, 0, img.size.height);
  CGContextScaleCTM(context, 1.0, -1.0);
 
  // set the blend mode to color burn, and the original image
  CGContextSetBlendMode(context, kCGBlendModeNormal);
  CGRect rect = CGRectMake(0, 0, img.size.width, img.size.height);
  CGContextDrawImage(context, rect, img.CGImage);
 
  // set a mask that matches the shape of the image, then draw (color burn) a colored rectangle
  CGContextClipToMask(context, rect, img.CGImage);
  CGContextAddRect(context, rect);
  CGContextDrawPath(context,kCGPathFill);
 
  // generate a new UIImage from the graphics context we drew onto
  UIImage *coloredImg = UIGraphicsGetImageFromCurrentImageContext();
  UIGraphicsEndImageContext();
 
  //return the color-burned image
  return coloredImg;
}