title: Change Keyboard Color in UISearchBar with apperance
body: <p>I want to change the color of the keyboard to black, when the user taps on the search textfield.</p>
  
  <p>I was trying to achieve it with
  <code>UITextField *textField = [UITextField appearance];
      [textField setKeyboardAppearance:UIKeyboardAppearanceAlert];</code></p>
  
  <p>but my build fails with this message</p>
  
  <blockquote>
    <p>Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UISearchBarTextField _UIAppearance_setKeyboardAppearance:]: unrecognized selector sent to instance 0x8485260'</p>
  </blockquote>
  
  <p>Please can you help me with that?
  Thanks a lot</p>