title: NSWorkspace throwing error when bridging library with swift
body: <p>I'm using the <a href="https://github.com/Pocket/Pocket-ObjC-SDK" rel="nofollow">pocket api</a> and bridging it over to use with swift and it's throwing the error "Semantic issue: Use of undeclared identifier 'NSWorkspace'" for the following line in their obj-c API:</p>
  
  <p><code>[[NSWorkspace sharedWorkspace] openURL:url];</code></p>
  
  <p>The app is targeting os 10.9+, so it should be available.</p>
  
  <p>Any ideas on what can cause that error?</p>
  
  <p><strong>Update</strong>
  I've also tested in iOS, and it's returning the same error, but with 'UIApplication' instead of 'NSWorkspace'.</p>
  
  <p>I also forgot to mention I had to use the <code>-fno-objc-arc</code> flag in the <em>Build Phases</em> tab so the lib doesn't freak out over ARC.</p>