title: UIAlertView dismisses itself
body: <p>I have a UIAlertView that is called like so</p>
  
  <pre><code>let ac = UIAlertController(title: "Load Discovered!", message: "Please click confirm to confirm the collection of load: "+code, preferredStyle: .alert)
  ac.addAction(UIAlertAction(title: "OK", style: .default))
  present(ac, animated: true)
  </code></pre>
  
  <p>This presents itself over a <code>AVCaptureVideoPreviewLayer</code></p>
  
  <p>My issue is, it dismisses itself almost instantly when it appears, it doesn't wait for the OK input.</p>
  
  <p>I figure it's something to do with the fact it's displaying on top of an <code>AVCaptureVideoPreviewLayer</code> I'm just not sure what to do about it</p>