how to make UITextView height dynamic according to text length?

Question

As you can see in this image

the UITextView changes it\'s height according to the text length, I want to make it adjust it\'s height according to the te

Answer 1

1 Add an observer to the content length of textfield

   yourTextView.addObserver(self, forKeyPath: "contentSize", options: (NSKeyValueObservingOptions.new), context: nil);

2 Implement observer

override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        let tv = object as! UITextView;
        var topCorrect = (tv.bounds.size.height - tv.contentSize.height * tv.zoomScale)/2.0;
        topCorrect = ( topCorrect < 0.0 ? 0.0 : topCorrect );
        tv.contentOffset.x = 0;
        tv.contentOffset.y = -topCorrect;
        self.yourTextView.contentSize.height = tv.contentSize.height;
        UIView.animate(withDuration: 0.2, animations: {
            self.view.layoutIfNeeded();
        });
    }