Counting the number of lines in a UITextView, lines wrapped by frame size

Question

I wanted to know when a text is wrapped by the frame of the text view is there any delimiter with which we can identify whether the text is wrapped or not.

For insta

Answer 1

Improved and update Luke Chase's answer 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. Make UITextView scroll enable: false (disable scroll).

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
    }
}

-> Do not forgot to disable uitextview scroll. Cheers!<-

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