title: Create a custom left back button on UINavigationBar WITH the standard arrow on the left
body: <p>When I create a custom back button, I use the following code:</p>
  
  <pre><code>    UIBarButtonItem *leftButton = [[UIBarButtonItem alloc]initWithTitle:@"Yeah" style:UIBarButtonItemStyleBordered target:self action:@selector(backButtonPressed:)];
  self.navigationItem.leftBarButtonItem = leftButton;
  </code></pre>
  
  <p>This works fine, and I obtain this result:</p>
  
  <p><img src="https://i.stack.imgur.com/eiRZb.png" alt="Screenshot of the word &#39;Details&#39; where the back button would normally be."></p>
  
  <p>I would have the same result, but with an arrow on the left, like this (when it's a standard back button, not a custom one):</p>
  
  <p><img src="https://i.stack.imgur.com/etAbf.png" alt="Screenshot of the standard back arrow followed by the word &#39;Details&#39;."></p>
  
  <p>How can I simply add this arrow ?</p>