title: How to know when pushViewController is over?
body: <p>I'm doing this to push a new controller:</p>
  
  <pre><code>[navController pushViewController:addEventViewC animated:YES];
  [_addView setHidden:true];
  UIImage *buttonImage = [UIImage imageNamed:@"addEventFloat"];
  [_addButton setBackgroundImage:buttonImage forState:UIControlStateNormal];
  </code></pre>
  
  <p>The problem is that the image is changed during the animation, and I would prefer to change it AFTER the animation.</p>
  
  <p>Do you know how I could proceed?</p>
  
  <p>Thanks in advance</p>