title: UIStackView - hide and collapse subview with animation
body: <p>I'm trying to hide UIStackView's subview like this:</p>
  
  <pre><code>UIViewPropertyAnimator.runningPropertyAnimator(withDuration: 2.0, 
        delay: 0, options: [.curveEaseOut], animations: {
      self.label.isHidden = true
      self.label.alpha = 0.0
      self.stackView.layoutIfNeeded()
  })
  </code></pre>
  
  <p>However, the label disappears instantly with using this code. I suspect this is because of setting <code>isHidden</code> to true, which is required for collapsing.</p>
  
  <p>Is there a way how to hide and collapse UIStackView's subvew with animation? Or it might be better to not to use UIStackView at all?</p>