title: UIButton set as UIBarButtonItem is not disabled when set title on it (Works fine if I use UIImage in UIButton)
body: <p>I have a <code>UIBarButtonItem</code></p>
  
  <pre><code>@property (nonatomic, retain) UIBarButtonItem *editBarButton;
  </code></pre>
  
  <p>I simply insert a <code>UIButton</code> in <code>UIBarButtonItem</code>, with title, font &amp; etc in <code>viewDidLoad</code></p>
  
  <pre><code>    editButton =  [UIButton buttonWithType:UIButtonTypeCustom];
      editButton.titleLabel.font = [UIFont fontWithName:@"Helvetica-light" size:18];
      editButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
      [editButton setTitle:@"Post" forState:UIControlStateDisabled];
      //[editButton setImage:[UIImage imageNamed:@"status_post"] forState:UIControlStateNormal];
  
      [editButton addTarget:self action:@selector(editBarButtonPress:)forControlEvents:UIControlEventTouchUpInside];
      [editButton setFrame:CGRectMake(0, 0, 57, 30)];
      self.editBarButton = [[UIBarButtonItem alloc] initWithCustomView:editButton];
      self.navigationItem.leftBarButtonItem = self.editBarButton;
  </code></pre>
  
  <p>Latter I use it in many condition, like in <code>viewWillAppear</code> :</p>
  
  <pre><code>if (self.chatLogsArray.count)
  {
  self.editBarButton.enabled = YES;
  }
  else
  {
  self.editBarButton.enabled = NO;
  }
  </code></pre>
  
  <p>But it is not disable while I use title in Button. But works fine if I set an <code>UIImage</code> in <code>UIButton</code>. Why is that? And what I am missing?</p>
  
  <p>Thanks a lot in advance.</p>