title: What is the default height of UIBarButtonItem because it can't be 20?
body: <p>I search "for default height uibarbuttonitem" in google and found nothing.</p>
  
  <p>Where in the documentation it is mentioned?</p>
  
  <p>This is for portrait.</p>
  
  <p>Some says the size is 20. I tried 20 and there is no way the size is 20. It should be much higher.</p>
  
  <p>The purpose of this question is so I can create a REGULAR button that emulates a UIBarButtonItem.</p>
  
  <p>Note: most people say it's 20.</p>
  
  <p>I set the height as 20 and it's clearly seen that the regular button is much smaller than UIBarButtonItem.</p>
  
  <p><img src="https://i.stack.imgur.com/Cl49i.png" alt="enter image description here"></p>
  
  <p>Should I include a screenshot?</p>
  
  <p>As you see, the bottom campaign is 20 points height. And that's much shorter than the upper UIBarButton. So the upper UIBarButton can't be 20 points. How much?</p>