title: UICollectionView freezes the app after tap on an item - Xcode 7, iOS 9, Swift 2
body: <p>wired issue on iOS 9, Xcode official version (no beta):
  I have a CollectionView with a custom Cell, everything was working fine on iOS 8.x, now the app loads and display cells properly, but if I tap one of them, the app freezes, it doesn't even crash, it just freezes, <strong>and no errors in the console...</strong></p>
  
  <p>Here's my cellForItemAtIndexPath method:</p>
  
  <pre><code>func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -&gt; UICollectionViewCell {
  let cell = collectionView.dequeueReusableCellWithReuseIdentifier("PropertyCell", forIndexPath: indexPath) as! PropertyCell
  
  var propClass = PFObject(className: PROP_CLASS_NAME)
  propClass = self.recentArray[indexPath.row] as! PFObject
  
  // Get details
  let imageFile = propClass[PROP_IMAGE] as? PFFile
  imageFile?.getDataInBackgroundWithBlock { (imageData, error) -&gt; Void in
      if error == nil {
          if let imageData = imageData {
              cell.pImage.image = UIImage(data:imageData)
  } } }
  
  cell.typeActionLabel.text = "\(propClass[PROP_TYPE]!) - \(propClass[PROP_ACTION]!)"
  
  ....
  
  cell.layer.cornerRadius = 8
  
  return cell
  }
  
  
   // MARK: - TAP A CELL TO OPEN CONTROLLER
  func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
      var propClass = PFObject(className: PROP_CLASS_NAME)
      eventsClass = eventsArray[indexPath.row] as! PFObject
  
      let pdVC = storyboard?.instantiateViewControllerWithIdentifier("PropDetails") as! PropDetails
      pdVC.propObj = propClass
      navigationController?.pushViewController(pdVC, animated: true)
  }
  </code></pre>
  
  <p>I really don't have a clue about this issue, I wish at least the Console Log was showing something...</p>
  
  <p>Thanks for your help! </p>
  
  <p>EDIT:</p>
  
  <p>Ok, putting a breakpoint right before</p>
  
  <pre><code> let pdVC = storyboard?.instantiateViewControllerWithIdentifier("PropDetails") as! PropDetails
  </code></pre>
  
  <p>and going on line by line until the function ends, I get these messages in the console: </p>
  
  <pre><code>2015-09-18 16:20:31.894 iResidence[10480:515788] CFNetwork SSLHandshake failed (-9806)
  2015-09-18 16:20:31.895 iResidence[10480:515801] NSURLSession/NSURLConnection HTTP load failed (kCFStreamErrorDomainSSL, -9806)
  2015-09-18 16:20:43.964 iResidence[10480:515763] void SendDelegateMessage(NSInvocation *): delegate (webView:resource:didFailLoadingWithError:fromDataSource:) failed to return after waiting 10 seconds. main run loop mode: kCFRunLoopDefaultMode
  </code></pre>
  
  <p>Any idea about what it is?
  Thanks again!</p>