title: ios 13 - Custom SearchBar with UISearchBar _searchField not working
body: <p>Before Xcode-11-Beta (ios13) below code for custom searchbar value for key to get textField working fine. Now getting below crash log.</p>
  
  <blockquote>
    <p>'NSGenericException', reason: 'Access to UISearchBar's _searchField ivar is prohibited. This is an application bug'</p>
  </blockquote>
  
  <pre><code>- (UITextField *)textField
  {
   return [self valueForKey:@"_searchField"];
  }
  </code></pre>
  
  <p>Any help appreciated. </p>