Tableview that observes changes in keyboard display

KeyboardObservingTableView.swift

protocol KeyboardDisplayChangeProtocol {
    func addKeyboardObserver(on view: UIView)
    func removeKeyboardObserver()
}

public class KBTableView: UITableView {
    
    weak var view: UIView?
    
    public func addKeyboardObserver(on view: UIView) {
        self.view = view
        NotificationCenter.default.addObserver(self, selector: #selector(adjustForKeyboardChange(_:)), name: NSNotification.Name.UIKeyboardDidShow, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(adjustForKeyboardChange(_:)), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
    }
    
    public func removeKeyboardObserver() {
        NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardDidShow, object: nil)
        NotificationCenter.default.removeObserver(self, name: NSNotification.Name.UIKeyboardWillHide, object: nil)
    }
    
    public func adjustForKeyboardChange(_ notification: Notification) {
        let userInfo = notification.userInfo!
        
        let keyboardScreenEndFrame = (userInfo[UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
        let keyboardViewEndFrame = view?.convert(keyboardScreenEndFrame, from: view)
        
        self.isScrollEnabled = true
        
        if notification.name == NSNotification.Name.UIKeyboardWillHide {
            self.contentInset = UIEdgeInsets.zero
        } else {
            self.contentInset = UIEdgeInsets(top: 0, left: 0, bottom: keyboardViewEndFrame?.height ?? 0, right: 0)
            self.scrollIndicatorInsets = self.contentInset
        }
    }
}