文本字段问题Xcode

import UIKit

class ViewController: UIViewController, UITextFieldDelegate {
    @IBOutlet weak var textField: UITextField!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        textField.delegate = self
    }
    
    // MARK: - UITextFieldDelegate
    
    func textFieldDidBeginEditing(_ textField: UITextField) {
        // 键盘弹出时的处理逻辑
    }
    
    func textFieldDidEndEditing(_ textField: UITextField) {
        // 键盘收起时的处理逻辑
    }
    
    // 处理键盘遮挡问题
    @objc func keyboardWillShow(notification: NSNotification) {
        if let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
            if self.view.frame.origin.y == 0 {
                self.view.frame.origin.y -= keyboardSize.height
            }
        }
    }
    
    @objc func keyboardWillHide(notification: NSNotification) {
        if self.view.frame.origin.y != 0 {
            self.view.frame.origin.y = 0
        }
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: UIResponder.keyboardWillHideNotification, object: nil)
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillShowNotification, object: nil)
        NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillHideNotification, object: nil)
    }
}