SWIFT - Moving UITextField with the keyboard

MessageVC.Swift

import UIKit

class MessageVC: UIViewController {

    @IBOutlet weak var textViewMessage: UITextView!
    @IBOutlet weak var heightMessage: NSLayoutConstraint!
    @IBOutlet var viewMessage: UIView! // the view that will be attached to the keyboard
    
    var messageVM: MessageViewModel!
    let MESSAGE_INITIAL_SIZE: CGFloat = 44
    let MESSAGING_PADDING: CGFloat = 16
    var keyboardHeight:CGFloat = 0
    
    
    override func viewDidLoad() {
        super.viewDidLoad()

        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: NSNotification.Name.UIKeyboardWillChangeFrame, object: nil)
    }
    
    override var inputAccessoryView: UIView? {
        return viewMessage
    }

    override var canBecomeFirstResponder: Bool {
        return true
    }
  
    deinit {
        NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillChangeFrame, object: nil)
    }
  
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        messageVM.fetchData()
    }
    
    @IBAction func sendMessage(_ sender: UIButton) {
        guard let message = textViewMessage.text, message.count > 0 else {
            return
        }
        let valueIncreasedOnTextView = textViewMessage.frame.height - MESSAGE_INITIAL_SIZE
        textViewMessage.text = ""
        self.keyboardHeight -= valueIncreasedOnTextView
        checkKeyboard(textView: textViewMessage)
    }
    
    func keyboardWillShow(notification: NSNotification) {
        if let keyboardSize = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
            UIView.animate(withDuration: 0.4, delay: 0, options: UIViewAnimationOptions.curveEaseIn, animations: {
                self.keyboardHeight = keyboardSize.height
                self.checkKeyboard(textView: self.textViewMessage)
                }, completion: {_ in
                    if self.keyboardHeight > 60 {
                        if self.messageVM.count > 0 {
                            let indexPath = IndexPath(row: self.messageVM.count-1, section: 0)
                            self.tableView.scrollToRow(at: indexPath, at: UITableViewScrollPosition.bottom, animated: true)
                        }
                    }
            })
        }
    }
    
    func checkKeyboard(textView: UITextView){
        if textView.contentSize.height > MESSAGE_INITIAL_SIZE {
            heightMessage.constant = textView.contentSize.height
            for constraint in (inputAccessoryView?.constraints)! {
                if constraint.constant == viewMessage.frame.height {
                    constraint.constant = MESSAGING_PADDING + textView.contentSize.height
                    tableView.contentInset.bottom = keyboardHeight
                }
            }
        }else{
            heightMessage.constant = MESSAGE_INITIAL_SIZE
            for constraint in (inputAccessoryView?.constraints)! {
                if constraint.constant == viewMessage.frame.height {
                    constraint.constant = MESSAGING_PADDING + MESSAGE_INITIAL_SIZE
                    tableView.contentInset.bottom = keyboardHeight
                }
            }
        }
    }
}

extension MessageVC: UITextViewDelegate {
    func textViewDidChange(_ textView: UITextView) {
        checkKeyboard(textView: textView)
    }
}