// MARK: - UIKeyBoard

extension Your_Controller {

    func registerKeyboardNotifications() {
        NotificationCenter.default.addObserver(self,
                                               selector: #selector(keyboardWillShow(notification:)),
                                               name: NSNotification.Name.UIKeyboardWillShow,
                                               object: nil)
        NotificationCenter.default.addObserver(self,
                                               selector: #selector(keyboardWillHide(notification:)),
                                               name: NSNotification.Name.UIKeyboardWillHide,
                                               object: nil)
    }

    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        NotificationCenter.default.removeObserver(self)
    }

    @objc func keyboardWillShow(notification: NSNotification) {
        let userInfo: NSDictionary = notification.userInfo! as NSDictionary
        let keyboardInfo = userInfo[UIKeyboardFrameBeginUserInfoKey] as! NSValue
        let keyboardSize = keyboardInfo.cgRectValue.size
        let contentInsets = UIEdgeInsets(top: 0, left: 0, bottom: keyboardSize.height + 30, right: 0)
        UI?.scrollView.contentInset = contentInsets
        UI?.scrollView.scrollIndicatorInsets = contentInsets
    }

    @objc func keyboardWillHide(notification: NSNotification) {
        UI?.scrollView.contentInset = .zero
        UI?.scrollView.scrollIndicatorInsets = .zero
    }
}