title: Ionic 2 - global NavBar for the app
body: <p>In Ionic 1, we have the ability to define an <code>&lt;ion-nav-bar&gt;</code> above an <code>&lt;ion-nav-view&gt;</code>, which serves as a generic nav bar for the entire app and we could turn it off on a per-view basis (using <code>ionNavView</code>'s <code>hideNavBar=true|false</code>.</p>
  
  <p>It appears in Ionic 2 we have to insert an <code>&lt;ion-nav-bar&gt;</code> per page - and cannot have a global nav bar for the entire app. Is that correct, or am I missing a trick?</p>
  
  <p>If so - it seems like a lot of duplicated code?</p>
  
  <p>Also, it appears you do not have the ability for the NavBar to build its own back button, and you have to write the own mark-up for the back button yourself (per page) which, again, seems like a lot of code duplicate.</p>