UIKeyboardWillChangeFrameNotification swift implementation

Question

很长一段时间以来，我一直在寻找一个利用UIKeyboardWillChangeFrameNotification的Swift实现到目前为止我还没有遇到任何问题。我正在努力使其工作，以便我可以处理键盘显示并隐藏在文档here中所述的一种方法中，以及用objective-c编写的here。

并替换这些：

// Register your Notification, To know When Keyboard appears.
NotificationCenter.default.addObserver(self, selector: #selector(myKeyboardWillShowMethod), name: .UIKeyboardWillShow, object: nil)

// Register your Notification, To know When Keyboard hides.
NotificationCenter.default.addObserver(self, selector: #selector(myKeyboardWillHideMethod), name: .UIKeyboardWillHide, object: nil)