title: Using UIToolbar above UITabbar - is it possible?
body: <p>My question is similar to this <a href="https://stackoverflow.com/questions/9350421/adding-a-uitoolbar-above-a-uitabbar-logic-issue">one</a>, but not exactly answered there.</p>
  
  <p>What I want to do, is to convert an existing navigation-based app with different <code>UIToolbars</code> at the bottom of the individual <code>UITableViews</code> into an app that has a <code>UITabbar</code> interface. One of the tabs shall show the same hierachy of UITableView data as the existing app (which displays some kind of hierarchical data), whereas the others will be assigned something else (say: Settings, Help, ...) that is of no concern here. The idea is to allow the user to quickly switch to the "Help"-Screen from whatever stage of the navigation stack - and back.</p>
  
  <p>For example, using 3 Tabs:</p>
  
  <pre><code> 1. Database root (UIToolbar) - folder 1 (UIToolbar) - file 1.1
                                                       - file 1.2
                                - folder 2 (UIToolbar) - file 2.1
                                                       - file 2.2
   2. Help (no UIToolbar)
   3. Settings (no UIToolbar)
  </code></pre>
  
  <p>I have never seen such a design in any existing app, although <a href="https://stackoverflow.com/questions/9350421/adding-a-uitoolbar-above-a-uitabbar-logic-issue">the question cited above</a> suggests that it might in fact be possible to keep the existing UIToolbars from the old app and simply place them above the tab bar. </p>
  
  <p>Is this </p>
  
  <ul>
  <li>technically possible (without problems e.g. with device rotation)?</li>
  <li>allowed by Interface guidelines?</li>
  </ul>
  
  <p>Although sample code would be appreciated, I mostly would like to find out whether it is worth trying to build an app like this - or whether such a design is a bad idea in the first place.</p>