title: How to call button height in swift
body: <p>I am trying to call a button height so I can dynamically set the y position equal to view that way dynamically the size will be constant. i can't find how to call the height. I am trying to do something like this:  </p>
  
  <pre><code>    UIView.animate(withDuration: 0.5, animations: {
          self.blurryVeiw.frame = CGRect(x: 0, y: (screenHeight - **buttion height**), width: screenWidth, height: 400)
      }) { (finished) in
  
      }
  </code></pre>