为UITextField或UITextView显示键盘时调整界面

override func viewDidLoad() {
    super.viewDidLoad()
    
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(notification:)), name: UIResponder.keyboardWillShowNotification, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(notification:)), name: UIResponder.keyboardWillHideNotification, object: nil)
}

@objc func keyboardWillShow(notification: NSNotification) {
    guard let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue else { return }
    guard let duration = notification.userInfo?[UIResponder.keyboardAnimationDurationUserInfoKey] as? Double else { return }
    guard let curve = notification.userInfo?[UIResponder.keyboardAnimationCurveUserInfoKey] as? UInt else { return }
    
    let insets = UIEdgeInsets(top: 0, left: 0, bottom: keyboardSize.height, right: 0)
    
    UIView.animate(withDuration: duration, delay: 0, options: UIView.AnimationOptions(rawValue: curve), animations: {
        self.scrollView.contentInset = insets
        self.scrollView.scrollIndicatorInsets = insets
    }, completion: nil)
}

@objc func keyboardWillHide(notification: NSNotification) {
    guard let duration = notification.userInfo?[UIResponder.keyboardAnimationDurationUserInfoKey] as? Double else { return }
    guard let curve = notification.userInfo?[UIResponder.keyboardAnimationCurveUserInfoKey] as? UInt else { return }
    
    UIView.animate(withDuration: duration, delay: 0, options: UIView.AnimationOptions(rawValue: curve), animations: {
        self.scrollView.contentInset = .zero
        self.scrollView.scrollIndicatorInsets = .zero
    }, completion: nil)
}