title: UISearchResultsUpdating getting crash when it s called
body: <p>Hi I am using Apple <a href="https://developer.apple.com/library/ios/samplecode/UICatalog/Listings/Objective_C_UICatalog_AAPLSearchShowResultsInSourceViewController_h.html#//apple_ref/doc/uid/DTS40007710-Objective_C_UICatalog_AAPLSearchShowResultsInSourceViewController_h-DontLinkElementID_38" rel="nofollow">CATALOG</a> Source code for displaying search bar controller on navigation controller. </p>
  
  <p>It does load, but when i click on search, it get crash due to <strong>UISearchResultsUpdating</strong>-</p>
  
  <p>Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[AAPLSearchBarEmbeddedInNavigationBarViewController updateSearchResultsForSearchController:]: unrecognized selector sent to instance 0x15db8ab0'</p>
  
  <p>Suggest me the reason for crash.</p>
  
  <p>code for crash -</p>
  
  <pre><code>- (void)updateSearchResultsForSearchController:(UISearchController *)searchController {
  
    if (!searchController.active) {
      return;
    }
  
  self.filterString = searchController.searchBar.text;
  }
  </code></pre>