title: how to display UIViewController from a NSObject class?
body: <p>There is a current view as <code>UIViewController</code> which call "LoginView" but I'm not in, I'm in a <code>NSObject</code> class and I want to call, display an other <code>UIViewController</code> which is call "MapView". How can I do this?<img src="https://i.stack.imgur.com/Qvp4x.png" alt="enter image description here"></p>
  
  <p>The problem is like above screenshot.</p>