title: How to calculate the height of the text in my UITextView?
body: <p>how can I know the height of the text inside this textView?</p>
  
  <pre><code>lazy var textView: UITextView = {
      let tv = UITextView()
      tv.textColor = .white
      tv.translatesAutoresizingMaskIntoConstraints = false
      tv.isEditable = false
      tv.backgroundColor = .white
      tv.text = "Se non vuoi vedere di nuovo questa presentazione clicca sul bottone qui sotto..."
      tv.textAlignment = .center
      tv.font = UIFont(name: "Avenir-Light", size: 22)
      return tv
  }()
  </code></pre>