title: UIBarButtonItem image not set
body: <p>I have very strange problem. I'm initializing some UI elements inside completion block of AFNetworking, and only one of them (<code>UIBarButtonItem</code>) is not initializing. Here is my code which is placed in <code>viewDidLoad</code>:</p>
  
  <pre><code>AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
  
  [m_httpClient registerHTTPOperationClass:[AFHTTPRequestOperation class]];
  
  [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
  
       NSError* error;
       self.m_pointData = [NSJSONSerialization
                          JSONObjectWithData:responseObject
                          options:kNilOptions
                          error:&amp;error];
  
       [self InitializeFields];
   }
   failure:^(AFHTTPRequestOperation *operation, NSError *error)
   {
       NSLog(@"Error in get point response: %@", error);
   }];
  
  [operation start];
  </code></pre>
  
  <p>}</p>
  
  <p>I do initialization inside InitializeFields and here is the code:</p>
  
  <pre><code>self.m_placeName.text = [self.m_pointData objectForKey:@"name"];
  
  self.m_placeLocation.text = [self.m_pointData objectForKey:@"city"];
  
  NSArray* comments = [self.m_pointData objectForKey:@"comments"];
  
  const int commentsCount = [comments count];
  
  self.m_commentsCount.text = [NSString stringWithFormat:@"%d", commentsCount];
  
  self.m_scrollView.m_address.text = [self.m_pointData objectForKey:@"address"];
  self.m_scrollView.m_email.text = [self.m_pointData objectForKey:@"email"];
  self.m_scrollView.m_phone.text = [self.m_pointData objectForKey:@"tel"];
  self.m_scrollView.m_link.text = [self.m_pointData objectForKey:@"website"];
  
  self.m_rightBtn.image = [UIImage imageNamed:@"favorite_star_inactive.png"];
  </code></pre>
  
  <p>Only the last line – <code>self.m_rightBtn.image = [UIImage imageNamed:@"favorite_star_inactive.png"];</code> – does not work. When I'm moving it to <code>viewDidLoad</code> it works. Something with completion block, but I don't know what.</p>