如何在用户开始键入时将UIButton移至小键盘

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: NSNotification) {
    if let keyboardSize = (notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
        let buttonHeight = myButton.frame.size.height
        let buttonY = keyboardSize.origin.y - buttonHeight - 10 // 10为按钮与键盘之间的间距
        myButton.frame = CGRect(x: myButton.frame.origin.x, y: buttonY, width: myButton.frame.size.width, height: myButton.frame.size.height)
    }
}

@objc func keyboardWillHide(notification: NSNotification) {
    // 恢复按钮原来的位置
    myButton.frame = CGRect(x: originalX, y: originalY, width: myButton.frame.size.width, height: myButton.frame.size.height)
}

deinit {
    NotificationCenter.default.removeObserver(self)
}