title: Mark a method as deprecated
body: <p>I have a change in my API and I want to mark one method as deprecated. 
  I've put the following on it's signature:
       <strong>attribute</strong>((deprecated("Don't use this method")));
  However, I don't know how do I need to behave in the method body itself.</p>
  
  <p>Can't find anything on Apple coding starts to lead me. 
  The method return BOOL. 
  should I just return false? </p>