@objc func keyboardWillShow(notification: Notification) {
    guard let userInfo = notification.userInfo,
          let keyboardFrameValue = userInfo[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue else {
        return
    }
    let keyboardHeight = keyboardFrameValue.cgRectValue.height
    
    textViewBottomAnchor.isActive = false
    
    // 키보드가 나타날 경우 textView의 bottomAnchor 조정
    textViewBottomAnchor = textView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor, constant: -keyboardHeight)

    textViewBottomAnchor.isActive = true
    }

@objc private func keyboardWillShow(notification: Notification) {
    guard let userInfo = notification.userInfo,
          let keyboardFrameValue = userInfo[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue else {
        return
    }
    let keyboardHeight = keyboardFrameValue.cgRectValue.height
        
    textView.contentInset.bottom = keyboardHeight
    textView.verticalScrollIndicatorInsets.bottom = keyboardHeight
    }

private func configureLayout() {
    //...    
    view.keyboardLayoutGuide.followsUndockedKeyboard = true
        
    NSLayoutConstraint.activate([
        view.keyboardLayoutGuide.topAnchor.constraint(equalTo: textView.bottomAnchor),
        
        //...           
            
        textView.bottomAnchor.constraint(equalTo: view.keyboardLayoutGuide.topAnchor)
        ])
    }

private func configureLayout() {
    view.addSubview(textView)
    textView.contentOffset = .zero // 추가
    
    // 이하 layout 설정
}

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    
    fetchContents()
    tableView.reloadData()
}

// MARK: - DiaryDetailViewController Delegate
extension DiaryListViewController: DiaryDetailViewControllerDelegate {
    func createCell(contents: Contents) {
        // ...
        contentsList?.append(contents)
        tableView.insertRows(at: [selectedCellIndex], with: .automatic)
    }
    
    func updateCell(contents: Contents) {
        // ...
        contentsList?[selectedCellIndex.row] = contents
        tableView.reloadRows(at: [selectedCellIndex], with: .automatic)
    }
    
    func deleteCell() {
        // ...
        contentsList?.remove(at: selectedCellIndex.row)
        tableView.deleteRows(at: [selectedCellIndex], with: .fade)
    }
}

	// ...
	weak var delegate: DiaryDetailViewControllerDelegate?
	// ...
	private func updateContents() {
	    // ...
	    delegate?.updateCell(contents: contents)
	    // ...
	}
	    
	private func createContents() {
	    // ...
	    delegate?.createCell(contents: contents)
	    // ...
	}
	        
	private func deleteContents() {
	    // ...
	    delegate?.deleteCell()
	    // ...
	}

/*  ContentsDTO은 다음의 용도로 사용됩니다.
    1. JSON 데이터 Decode를 위한 모델
    2. VC에서 사용되는 모델
    3. VC에서 CoreData와 데이터를 주고받는 모델 */

struct ContentsDTO: Codable {
    var title: String
    var body: String
    let date: Double
    let identifier: UUID?
    var weather: Weather?
    ...
}