title: why bundle is nil, after initWithNibName? objective-c
body: <p>i was wondering : why do we set "bundle" to "nil", when we alloc-init a viewController?</p>
  
  <p>example : </p>
  
  <blockquote>
    <p>MyViewController *viewController = [[MyViewController alloc] initWithNibName:@"MyViewController" bundle:nil];</p>
  </blockquote>
  
  <p>Thanks</p>
  
  <p>Paul</p>