如何同时获取所选 UITextField 的键盘大小和 CGFrame 大小？

我正在运行时动态填充UIScrollView具有许多UITextField字段的垂直。我遇到的问题是键盘会隐藏它出现的区域中的字段，这可能包括我正在编辑的字段。

我尝试了 Apple 文档中的KeyboardManagement解决方案，并尝试在textFieldDidBeginEditing和上使用通知，textFieldDidEndEditing但在这两种情况下的问题是，keyboardWillShow有时通知首先出现，在这种情况下，它不会让我知道哪个字段是正在编辑的字段。

我在一个实现UITextFieldDelegate协议的类中有这段代码，这个类的每个对象都持有对这些字段之一的引用，并作为委托工作

func textFieldDidBeginEditing(_ textField: UITextField) {
    self.activeTextfield = self.valueTextField
}

func textFieldDidEndEditing(_ textField: UITextField) {
    self.activeTextfield = nil
}

该activeTextfield变量是弱引用的变量UIViewController，所有这一切都发生。在该视图控制器中，我有以下代码

class MyClass: UIViewController {
    var activeTextfield: CustomTextField! // This is the variable I was talking about on the previous paragraph

    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)
    }

    @objc func keyboardWillShow(_ notification: Notification) {
        if self.view.frame.origin.y == 0 {
            guard let userInfo = notification.userInfo else { return }
            guard let keyboardSize = userInfo[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue else { return }

            let keyboardFrame = keyboardSize.cgRectValue
            let textFieldFrame = activeTextfield!.frame // activeTextfield sometimes is nil because this notification happens before the previous code block

            if textFieldFrame.origin.y + textFieldFrame.size.height > keyboardFrame.origin.y {
                self.view.frame.origin.y -= keyboardFrame.height
            }
        }
    }

    @objc func keyboardWillHide(_ notification: Notification) {
        if self.view.frame.origin.y != 0 {
            guard let userInfo = notification.userInfo else { return }
            guard let keyboardSize = userInfo[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue else { return }

            let keyboardFrame = keyboardSize.cgRectValue

            self.view.frame.origin.y += keyboardFrame.height
        }
    }
}

有什么方法可以强制UITextField在键盘通知之前调用委托方法？

这是处理这种情况的正确方法吗？

如果不是，我应该如何处理？

谢谢