UITextView+UITableViewCell.swift

// Improved and update **Luke Chase's** [answer][1] to Swift 5, XCode 11, iOS 13 to get text view number of lines and autoresize table view cell height.

// 1) You can use storyboard with static cell height to design it as you want.

// 2) In viewDidLoad add your estimated row height and your textView delegate.
    override func viewDidLoad() {
            super.viewDidLoad()
    
            quoteTextView.delegate = self
            tableView.estimatedRowHeight = 142

        }

// 3) Add table view delegates for heightForRowAt:
    override func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        return UITableView.automaticDimension
    }

// 4) Conform to UITextViewDelegate to listen when user inputs text.
    extension ViewController: UITextViewDelegate {
        
        func textViewDidChange(_ textView: UITextView) {
            // Refresh tableView cell
            if textView.numberOfLines > 2 { // textView in storyboard has two lines, so we match the design
                // Animated height update
                DispatchQueue.main.async {
                    self.tableView?.beginUpdates()
                    self.tableView?.endUpdates()
                }
            }
        }
    }

// 5) Add UITextView extension so you avoid redundant code and use all over the app.
    extension UITextView {
        var numberOfLines: Int {
            // Get number of lines
            let numberOfGlyphs = self.layoutManager.numberOfGlyphs
            var index = 0, numberOfLines = 0
            var lineRange = NSRange(location: NSNotFound, length: 0)
    
            while index < numberOfGlyphs {
                self.layoutManager.lineFragmentRect(forGlyphAt: index, effectiveRange: &lineRange)
              index = NSMaxRange(lineRange)
              numberOfLines += 1
            }
    
            return numberOfLines
        }
    }

**Preview**

[![autoresize textview height swift][2]][2]


  [1]: https://stackoverflow.com/a/39309641/7987502
  [2]: https://i.stack.imgur.com/X7J7s.gif