title: How to update constraints programmatically?
body: <p>I want to update constraints programmatically in code. I have added them in storyboard controller. I made <code>IBOutlet</code> for the constraints and connected them. I added values in <code>updateViewConstrains()</code> but it isn't working:</p>
  <pre><code>func updateViewConstraints() {
      centerYConstraint.constant = 60
  
      super.updateViewConstraints()
  }
  </code></pre>