title: Start search after three letters in uisearchcontroller
body: <p>I would like uisearchcontroller to start searching after I type at least three characters in search bar. So, what should I do for that ?</p>
  
  <pre><code>    func configureSearchController() {
      // Initialize and perform a minimum configuration to the search controller.
      searchController = UISearchController(searchResultsController: nil)
      searchController.searchResultsUpdater = self
      searchController.dimsBackgroundDuringPresentation = false
      searchController.searchBar.placeholder = "Search"
      searchController.searchBar.delegate = self
      searchController.searchBar.sizeToFit()
  
      let textFieldInsideSearchBar = searchController.searchBar.valueForKey("searchField") as! UITextField
      textFieldInsideSearchBar.font = UIFont(name: "Bauhaus", size: 19)
  
  
     searchController.searchBar.setImage(UIImage(named: "searchikon"), forSearchBarIcon: UISearchBarIcon.Search, state: UIControlState.Normal);
  
      // Place the search bar view to the tableview headerview.
      TableView.tableHeaderView = searchController.searchBar
  </code></pre>