1         CGPoint currentPoint = [touch locationInView:imageView]; 2         UIGraphicsBeginImageContext(self.imageView.frame.size); 3         [imageView.image drawInRect:imageView.bounds]; 4          5         CGContextRef context = UIGraphicsGetCurrentContext();  6         CGRect cirleRect = CGRectMake(currentPoint.x-30, currentPoint.y-30,60, 60);  7  8         CGContextAddArc(context,currentPoint.x, currentPoint.y,30, 0, 2*M_PI, 0); 9         CGContextClip(context); 10         CGContextClearRect(context,cirleRect);11           imageView.image=UIGraphicsGetImageFromCurrentImageContext(); 12         UIGraphicsEndImageContext();