title: ios how simulate back button in a ViewController
body: <p>i have more viewcontroller that start from rootviewcontroller.
  So for example i start with controller A so pass to B and go to C the third.</p>
  
  <p>Normally to come back we need to push back on left top.
  Instead i want to know if is possible instead use back button by code come previus view controller that in this case is B.</p>
  
  <p>to go on the next i use this</p>
  
  <pre><code>ViewController *sc = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
  
      [[self navigationController] pushViewController:sc animated:YES];
  </code></pre>