iOS 7 taking screenshot of part of a UIView

I have a view (testView) that is 400x320 and I need to take a screenshot of part of this view (say rect = (50, 50, 200, 200)). I am playing around with the drawViewHierarchy method in iOS 7 but I can't figure out how to do it correctly.

    UIGraphicsBeginImageContextWithOptions(self.testView.bounds.size, NO, [UIScreen mainScreen].scale);

    [self.testView drawViewHierarchyInRect:self.testView.bounds afterScreenUpdates:YES];

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

Any help will be appreciated!

Thanks.