我的Scrollview在按下键盘Swift iOS后不能一直向上滚动

NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(_:)), name: UIResponder.keyboardWillShowNotification, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(_:)), name: UIResponder.keyboardWillHideNotification, object: nil)

@objc func keyboardWillShow(_ notification: Notification) {
    guard let keyboardFrame = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? CGRect else {
        return
    }
    
    let contentInset = UIEdgeInsets(top: 0, left: 0, bottom: keyboardFrame.height, right: 0)
    scrollView.contentInset = contentInset
    scrollView.scrollIndicatorInsets = contentInset
    
    // 滚动到当前输入框的位置
    if let activeTextField = findActiveTextField() {
        let rect = activeTextField.convert(activeTextField.bounds, to: scrollView)
        scrollView.scrollRectToVisible(rect, animated: true)
    }
}

@objc func keyboardWillHide(_ notification: Notification) {
    scrollView.contentInset = .zero
    scrollView.scrollIndicatorInsets = .zero
}

func findActiveTextField() -> UITextField? {
    // 遍历ScrollView的subviews，找到当前活跃的UITextField
    for subview in scrollView.subviews {
        if let textField = subview as? UITextField, textField.isFirstResponder {
            return textField
        }
    }
    return nil
}