title: How to detect iPad user tap on keyboard hide button?
body: <p>In my app I have some complex logic surrounding the hiding and showing of the keyboard. I am interested in detecting when the user (who has an iPad) specifically taps on the iPad keyboard hide button:</p>
  
  <p><img src="https://i.stack.imgur.com/68Yvx.png" alt="alt text"></p>
  
  <p>I am <em>not</em> interested in detecting when the keyboard is supposed to hide, only when the user actually physically taps on this button. Any suggestions?</p>
  
  <p>Thank you!</p>