title: UIScrollView is not working / Error width and height
body: <p>I've <code>scrollView</code> and I inserted to my <code>scrollView</code> many objects, but my <code>scrollView</code> get me error it's width and height are (0.0)</p>
  
  <p><strong>Code:</strong></p>
  
  <pre><code>lazy var scrollView: UIScrollView = {
      let scroll = UIScrollView()
      scroll.contentSize = CGSize(width: view.frame.size.width, height: 1200)
      scroll.backgroundColor = UIColor(red: 244/255, green: 244/255, blue: 244/255, alpha: 1)
      return scroll
  }()
  
  override func viewDidLoad() {
      super.viewDidLoad()
  
      print(scrollView.frame.size.height)
  }
  
  func setupScrollView() {
  
      scrollView.isScrollEnabled = true
      self.view.addSubview(scrollView)
      scrollView.anchor(top: view.topAnchor, left: view.leftAnchor, bottom: view.bottomAnchor, right: view.rightAnchor, paddingTop: 0, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, width: 0, height: 0)
  
  }
  </code></pre>
  
  <p>When I changed width and height in constraint get me error!</p>
  
  <p>What is the problem??</p>