title: 'release' is unavailable: not available in automatic reference counting mode
body: <p>I'm learning how to program on the iOS operating system using the book "Head first iPhone and iPad development" (second edition).</p>
  
  <p><img src="https://i.stack.imgur.com/PjUQe.png" alt="Screenshot"></p>
  
  <p>When I try to compile the code from the book, I get the error that the use <code>release</code> keyword is not allowed in reference counting mode.</p>
  
  <p>Do I have to explicitly release the memory in this case? If yes - how?</p>