title: CollectionView background clearColor not working
body: <p>I'm developing a small collectionview 'framework' to behave like a browser tab bar (think chrome) on the iPad. The code is all done, custom flow layout, reordering, and so on and is organized as so :</p>
  
  <p>• TabBarCollectionViewController .h/.m/.xib contains the high logic of the collection view (delegates + datasource methods). I have the xib to configure the collectionView settings and set the custom flow layout (I could do this programmatically, but oh well it's easier that way).</p>
  
  <p>• CustomFlowLayout .h/.m (subclass of flow layout)</p>
  
  <p>• TabBarCell .h/.m/.xib (subclass of collectionviewcell)</p>
  
  <p>Then I'm adding the TabBarCVC as a childViewController on my main viewController (this viewController has many childViewController and subviews) and then as a subview.
  At this point all is working fiiiiine.</p>
  
  <p>Now the problem, it's so stupid i can't believe i haven't found a way to do this, <strong>the backgroundColor of the collectionView is not settable to clearColor</strong>. I can put it in gray or whatever color, but that it doesn't support transparency. The cell background color is also clear and does work.</p>
  
  <p>I need the collectionView to be transparent to show the texture on the main view behind. Any insight would be much appreciated, or perhaps i'll fill my first radar to apple.</p>
  
  <p>If i can't find any solution i'll just add the 'screenshot' of the texture supposed to be behind the collectionView and add it as a imageView in the collectionView's backgroundView.</p>