Detect moment when newline starts in UITextView

Question

I try to detect when carriage goes at new line in UITextView. I can detect it by comparison total later width with UITextView width:

CGSize size = [textView.         


        

Answer 1

answer of @n00bProgrammer in Swift-4 with more precise line break detection.

@n00bProgrammer answer is perfect except one thing it reacts differently when the user starts typing in a first line, it presents that Started New Line too.
Overcoming issue, here is the refined code

    var previousRect = CGRect.zero
    func textViewDidChange(_ textView: UITextView) {
        let pos = textView.endOfDocument
        let currentRect = textView.caretRect(for: pos)
        self.previousRect = self.previousRect.origin.y == 0.0 ? currentRect : self.previousRect
        if currentRect.origin.y > self.previousRect.origin.y {
            //new line reached, write your code
            print("Started New Line")
        }
        self.previousRect = currentRect
    }