title: NSNotification only NSLog works
body: <p>In my Class X I post a Notification like this:</p>
  
  <pre><code>[[NSNotificationCenter defaultCenter] addObserver:viewController 
                                               selector:@selector(doThis:) 
                                                   name:@"myNotification" 
                                                 object:nil];
      [[NSNotificationCenter defaultCenter] postNotificationName:@"myNotification" object:nil];
  </code></pre>
  
  <p>In my Class Y I recieve it like this:</p>
  
  <pre><code>- (void) doThis: (NSNotification *) notification {
  NSLog(@"It works.");
  [uiTextView resignFirstResponder]; }
  </code></pre>
  
  <p>The console shows the NSLog message but my UITextView does not hide its keyboard.
  (In e.g. viewDidLoad the resignFirstResponder/becomeFirstResponder works.)</p>
  
  <p>Is there any special thing I need to do?</p>