title: Prevent keyboard from dismissing while pushing view controller
body: <p>I am having a hard time controlling keyboard behavior when I push a <code>UIViewController</code> using <code>pushViewController:animated:</code> The from view contains some <code>UITextField</code>s but the to view has none. If the keyboard is present at the time of the push, it self-resigns automatically alongside the horizontal push animation. It's a little jarring to see the from view slide down at the same time as the to view slides in.</p>
  
  <p>Can I have the keyboard maintain its position and slide horizontally out of view with the from controller? I've certainly seen this done the other way round, where the to controller has a presented keyboard sliding in from the left when pushed.</p>