title: How to log out self when add a symbol breakpoint at -[UIViewController viewWillAppear] method
body: <p>I have done it like this but it always give the error:</p>
  
  <pre><code>error: use of undeclared identifier 'self'
  error: 1 errors parsing expression
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/7eB70.jpg" alt="enter image description here"></p>