title: Tab Bar Controller Inside Nav Controller, is ok?
body: <p>I need to have a Tab Bar navigation at the end of a branch in the Navigation Controller, as illustrated basically below. (I am using storyboard for structure, and doing everything else programmatically.)</p>
  
  <ol>
  <li>Is this acceptable and stable? (Xcode seems to have no objections.)</li>
  <li>Could I put <em>another</em> Tab Bar nav, inside the initial Tab Bar nav, so there would be 3 tiers:<br>
  Nav Controller > Tab Bar > Tab Bar</li>
  </ol>
  
  <p>Thanks for any suggestions and advice.</p>
  
  <p><img src="https://i.stack.imgur.com/fHRq1.png" alt="enter image description here"></p>