Ios 在swift中隐藏和显示带有notificationCenter的键盘

我无法在我的SignUpViewController上显示和隐藏键盘

//Keyboard frame size
var keyboard = CGRect()

//Default function
override func viewDidLoad() {
    super.viewDidLoad()

    //scrollView frame size
    self.scrollView.frame = CGRect(x: 0, y: 0, width: self.scrollView.frame.size.width, height: self.scrollView.frame.size.height)
    scrollView.contentSize.height = self.view.frame.height
    scrollViewHeight = scrollView.frame.size.height

    //check notificvations if keyboard is shown or not
    let notificationCenter = NotificationCenter.default
    NotificationCenter.default.addObserver(self, selector: #selector(SignUpVC.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)

    NotificationCenter.default.addObserver(self, selector: #selector(SignUpVC.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}

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例如，您必须设置一个uitextfield作为第一响应者。

您试图实际显示键盘的内容是什么？在这里，您只是订阅事件，而不是显示或隐藏键盘。例如，如果您点击文本视图进行输入，并收到通知中心的通知，则会显示键盘。