title: Push ViewController full screen from bottom inside ModalView
body: <p>Inside my app I have a <code>MainVC</code>. From there I <code>present</code> another <code>ViewControllerB</code> and I would like to <code>push</code> inside there so this is how I achieve this:</p>
  <pre><code>let ViewControllerB = self.storyboard?.instantiateViewController(withIdentifier: &quot;ViewControllerB&quot;) as! ViewControllerB
  let navController = UINavigationController(rootViewController: communityVC)
  self.present(navController, animated: true, completion: nil)
  </code></pre>
  <p>This is working exactly how I want it to work. However in
  <code>ViewControllerB</code> I also would like to <code>push</code> a certain <code>ViewControllerC</code> <em>full screen</em>  from <em>bottom</em> and NOT just inside the <code>modalView</code>. I am calling this:</p>
  <pre><code>let firstLaunchVC = UIStoryboard(name: &quot;Main&quot;, bundle: nil).instantiateViewController(withIdentifier: &quot;FirstLaunchVC&quot;)
  let transition:CATransition = CATransition()
  transition.duration = 0.5
  transition.timingFunction = CAMediaTimingFunction(name: CAMediaTimingFunctionName.easeInEaseOut)
  transition.type = CATransitionType.push
  transition.subtype = CATransitionSubtype.fromTop
  self.navigationController?.modalPresentationStyle = .fullScreen
  self.navigationController!.view.layer.add(transition, forKey: kCATransition)
  self.navigationController?.pushViewController(firstLaunchVC, animated: true)
  </code></pre>
  <p>This is <code>pushing</code> from the <code>bottom</code> but NOT <code>fullscreen</code>. I also get this message in the terminal:</p>
  <blockquote>
  <p>Setting modalPresentationStyle once &lt;UINavigationController: 0x1060f2a00&gt; has been presented will have no effect until it is dismissed and presented again.</p>
  </blockquote>
  <p>How can I push fullscreen from a <code>presented</code> <code>ViewController</code>?</p>
  <p>I hope I made my problem clear. Let me know if you need more information on something.</p>