title: How to pass data to ViewController, using UIViewController
body: <p>How to pass data to ViewController using this code?</p>
  
  <pre><code>UIStoryboard *main = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
  
  UIViewController *vc = [main instantiateViewControllerWithIdentifier:@"Catalog"];
  
  [self presentViewController:vc animated:YES completion:nil];
  </code></pre>
  
  <p>I want to pass data in example to <em>itemId</em>, like here:</p>
  
  <pre><code>ViewController *vc = [[ViewController alloc] initWithNibName:nil bundle:nil];
  
  vc.itemId = 0;
  
  [[[[UIApplication sharedApplication] keyWindow] rootViewController] presentViewController:vc animated:YES completion:nil];
  </code></pre>