title: UICollectionView, Cell selection not working, cell scrolls fine
body: <p>So I have a uicollectionview, which resides inside a view controller, in this VC I have some buttons and other controls, and I load data into the CollectionView, I cannot detect the click on the collectionview, but it responds to scrolls fine.
  All I can think of is that sometimes I enable userinteraction on all subviews in my view ( including the collectionview) , and this works, in the sense that no controls work, and then based on another condition I enable activity.</p>
  
  <p>this is an example of the code</p>
  
  <pre><code>if (_isMenuVisible) {
    for (UIView *subview in [self.actualView subviews]) {
       if([subview isMemberOfClass:[UIButton class]] || [subview isMemberOfClass:[UILabel class]] ||   [subview isMemberOfClass:[UIView class]]) {
          subview.userInteractionEnabled = _isMenuVisible;
       }
       else {
          subview.userInteractionEnabled = !_isMenuVisible;
       }
    }
  }
  else {
    for (UIView *subview in [self.actualView subviews]) {
          subview.userInteractionEnabled = !_isMenuVisible;
    }
  }
  </code></pre>
  
  <p>Could this affect the behavior?</p>