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();
View Code
