title: Send bundled PDF to iBooks from within app
body: <p>I'm using the following code attached to a button, to attempt to open a PDF file in iBooks, but nothing's happening when I click the button. The method's definitely being called.</p>
  
  <pre><code>- (IBAction)openDocs
  {
      NSURL *url = [NSURL fileURLWithPath:@"MS.pdf"];
      UIDocumentInteractionController *docController = [[UIDocumentInteractionController alloc] init];
  
      docController = [UIDocumentInteractionController interactionControllerWithURL:url];
      docController.delegate = self;
  
      BOOL isValid = [docController presentOpenInMenuFromRect:CGRectZero inView:self.view animated:YES];
  }
  </code></pre>
  
  <p>I've declared the class itself as the relevant delegate, and since the documentation says there are no required delegate methods, that's all I've done. Nothing's happening when I tap the button, and I'm trying to figure out what I'm missing – any help is greatly appreciated!</p>