title: iOS6 viewDidUnload Deprecated
body: <p>Maybe this is a bad practice, but from the documentations that I read I got the advice to initialize objects in some cases inside the viewDidLoad method and nil it in viewDidUnload.</p>
  
  <p>For example if you have something like adding an Observer</p>
  
  <pre><code>[[NSNotificationCenter defaultCenter] addObserver:self
                                               selector:@selector(filterready:)
                                                   name:@"filterReady"
                                                 object:nil];
  </code></pre>
  
  <p>Now I don't have a method to remove the Observer, however the viewDidLoad becomes called every time the view is shown which results in having multiple observers running after a while and the selector is then called multiple times.</p>
  
  <p>I can fix this by moving some cleaners into the viewDidDisappear method, but now I have some doubts if I'm doing the right thing.</p>
  
  <p>In my sample I have multiple Navigation Controllers that are controlling their subnavigations, but the dealloc is never called for them, even though they are not referenced</p>