title: UISearchBar select all text
body: <p>Is there any way to select all text in UISearchBar?
  I tried [searchBar selectALL:], but it throw the signal (unrecognized selector).</p>
  
  <p>I want to allow user to alter previous search text. At the some time, when user just starts typing new request, the old one should be dismissed. The standard way how to achieve it - select all text at the moment when text begin editing.</p>