title: Proper way to set height of imageView
body: <p>When im working in Swift on <code>NSLayoutConstraint</code> and I want set height of <code>imageView</code> what is proper way to do that:</p>
  
  <p><strong>1) get view.frame.height CGFloat and use</strong></p>
  
  <pre><code>let viewHeight = view.frame.height
  customNSLayoputConstraints.append(imageView.heightAnchor.constraint(equalToConstant: viewHeight / 5))
  </code></pre>
  
  <p><strong>2) or use view.heightAnchor</strong></p>
  
  <pre><code>customNSLayoutConstraints.append(imageView.heightAnchor.constraint(equalTo: view.heightAnchor, multiplier: 0.2))
  </code></pre>
  
  <p>Thanks for answers.</p>