title: Check if NSURL is Local File
body: <p>This is a pretty simple question- how can I check if a NSURL is linking to a local file?</p>
  
  <p>I know, RTFM, but I checked the documentation and I don't seem to see any methods related to this.</p>
  
  <p>The only methods I <em>did</em> find were <code>-isFileReferenceURL</code> and <code>-isFileURL</code>, but I think these only check if the URL directly links to a file.</p>
  
  <p><em>Note:</em> I'm making an iPhone app, so by "local file" I mean a .html file stored in the project's resources.</p>
  
  <p>Thanks for any help in advance.</p>