How to adjust the height of a textview to his content in SWIFT?

Question

In my view controller, I have an UITextView. This textview is filled with a string. The string can be short or long. Depending on the length of the string, the height of the

Answer 1

In swift 2.3:

 func textViewDidChange(textView: UITextView) {

    let size = textView.sizeThatFits(CGSize(width: textView.frame.size.width, height: CGFloat.max))
    if size.height != TXV_Height.constant && size.height > textView.frame.size.height{
        TXV_Height.constant = size.height
        textView.setContentOffset(CGPointZero, animated: false)
    }
}