title: ActivityItems in UIActivityViewController don't show up
body: <p>I'm developing an app in iOS 7 and in it I need to show an activity controller. Below is my code,</p>
  
  <pre><code>UIActivityViewController *activityVC = [[UIActivityViewController alloc] initWithActivityItems:@[UIActivityTypeSaveToCameraRoll, UIActivityTypePostToFacebook, UIActivityTypePostToTwitter, UIActivityTypeMail, UIActivityTypeMessage, UIActivityTypePrint] applicationActivities:nil];
      [self presentViewController:activityVC animated:YES completion:nil];
  </code></pre>
  
  <p>But when its presented, this is how it looks.</p>
  
  <p><img src="https://i.stack.imgur.com/pHm4I.png" alt="enter image description here"></p>
  
  <p>None of the activity types I added in the array shows up. Why is this happening? Am I missing something? I'd like some help to get this working. I especially need the Facebook, twitter sharing and the saving to the local storage options here.</p>
  
  <p>Thank you.</p>
  
  <p><strong>Edit:</strong> I checked on a real device and the Facebook and Twitter sharing options show up. However <code>UIActivityTypeSaveToCameraRoll</code>, <code>UIActivityTypePrint</code> still aren't showing up.</p>