title: Call UIButton's action multiple times on long press
body: <p>I have 2 <code>UIButton</code>s that each one changes the number in the middle (please see the picture).</p>
  
  <p>I want that when the user holds the button the numbers will still be changing (now, when you want to change from 100 to 200 you need to tap 100 times and it's not good, I want that when you hold the button the numbers will be changing), that probably means that each <code>UIButon</code>'s action should be called again and again until the user releases the button.</p>
  
  <p><a href="https://i.stack.imgur.com/7sPQP.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/7sPQP.png" alt="Photo"></a></p>
  
  <p>How can I do that? Thanks!</p>