Keyboard handling extension for UIViewController

UIViewController+Keyboard.swift

import UIKit

extension UIViewController {
  
  func registerForKeyboardNotifications() {
    let center = NotificationCenter.default
    center.addObserver(
        self,
        selector: #selector(keyboardDidShow(_:)),
        name: NSNotification.Name.UIKeyboardDidShow,
        object: nil
    )
    center.addObserver(
        self,
        selector: #selector(keyboardWillShow(_:)),
        name: NSNotification.Name.UIKeyboardWillShow,
        object: nil
    )
    center.addObserver(
        self,
        selector: #selector(keyboardWillHide(_:)),
        name: NSNotification.Name.UIKeyboardWillHide,
        object: nil
    )
  }
  
  @objc open func keyboardDidShow(_ notification: NSNotification) {
  }
  
  @objc open func keyboardWillShow(_ notification: NSNotification) {
  }
  
  @objc open func keyboardWillHide(_ notification: NSNotification) {
  }
  
}