title: tap gesture not working on iOS 13.4 on textfield
body: <p>for some reason iOS 13.4 added buttonMaskRequired on its UITapGestureRecognizer class
  can anyone explain how to use it? because i want to test if it causes the tap gesture on my textfield not working, now i need to long tap which is not good user experience. on the earlier version 13.3.1, tap gesture normally work. for example in the past version of iOS this code works as it is: (iOS SWIFT)</p>
  
  <pre class="lang-swift prettyprint-override"><code>let tap2 = TouchGestureRecognizer(target: self, action: #selector(UpdateProfile.onCLickTextField(_:)))
  tap2.delegate = self
  
  if UserData.email == nil || UserData.email.isEmpty {
      tap2.numberOfTapsRequired = 1
  }
  
  email.addGestureRecognizer(tap2)
  email.isUserInteractionEnabled = true
  </code></pre>
  
  <p>it always work. not until iOS 13.4. and then i saw this change.<a href="https://i.stack.imgur.com/sD4ms.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/sD4ms.png" alt="enter image description here"></a></p>
  
  <p>can anyone explain how it works? and how to use it? thanks. sorry for my english. </p>