keyboard.swift

class VC: ViewController {
    var keyboardVisible = true
    
    override func viewDidLoad() {
        super.viewDidLoad()

        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(notification:)), name: .UIKeyboardWillShow, object: nil)
    }
    deinit {
        NotificationCenter.default.removeObserver(self)
    }
  
    @objc func keyboardWillShow(notification: NSNotification) {
        // 여기서 키보 높이 받을 수 있어
        let userInfo = notification.userInfo ?? [:]
        let keyboardFrame = (userInfo[UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue
      
      // do something
    }
}