title: Counting number of files in Directory with reference counting
body: <p>I have a folder of images that were imported with Create Folder Reference method, since I want to call images with URLForResoure for transfer to Watch.
  Before I transfer Images I would like to count them in folder. 
  I was able to get folderURL path with this code:</p>
  
  <pre><code>let documentsURL = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask)[0]
  
      let folderURL = documentsURL.URLByAppendingPathComponent("Folder/SubFolder", isDirectory: true)
  </code></pre>
  
  <p>but can not get access to files inside this folder.</p>
  
  <p>I want to access files and count them either with same prefix or inside subfolder.</p>
  
  <p>Please help.</p>