title: UIImageView should be as circle view instead of diamond in UICollectionView
body: <p>I have UICollectionView with UIImageView on it (as shown at image).</p>
  
  <p><a href="https://i.stack.imgur.com/4NsGK.png" rel="noreferrer"><img src="https://i.stack.imgur.com/4NsGK.png" alt="enter image description here"></a></p>
  
  <p>And I want to make it as circle view. But, when I running application, it's appearing as diamond (image below).</p>
  
  <p><a href="https://i.stack.imgur.com/XnRKH.png" rel="noreferrer"><img src="https://i.stack.imgur.com/XnRKH.png" alt="enter image description here"></a></p>
  
  <p>In <code>(UICollectionViewCell *)collectionView:(UICollectionView *)collectionView
                    cellForItemAtIndexPath:(NSIndexPath *)indexPath {
  </code> I setup it as</p>
  
  <pre><code>[cell.photo setImageWithURL:[NSURL URLWithString:url] usingActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
  
      cell.photo.layer.cornerRadius = cell.photo.bounds.size.width / 2;
      cell.photo.layer.masksToBounds = NO;
      cell.photo.clipsToBounds = YES;
  </code></pre>
  
  <p>For setup image I used libs <a href="https://github.com/JJSaccolo/UIActivityIndicator-for-SDWebImage" rel="noreferrer">SDWebImage</a></p>
  
  <p>And <strong>I'm sure, that cornerRadius value is correct</strong> (it's half of image width). Also I didn't make any manual changes in storyboard properties (position set as auto layout).
  What I missed? </p>