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我用Swift 4.2得到了这个错误

类型'NSNotification.Name'没有成员'keyboardDidShowNotification'

这是我的代码:

NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardDidShow(notification:)), name: NSNotification.Name.keyboardDidShowNotification, object: nil)

下面一个用Swift 4工作正常,但没有用Swift 4.2

NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardDidShow(notification:)), name: NSNotification.Name.UIKeyboardDidShow, object: nil)

Apple文档Ref:NSNotification.Name.keyboardDidShowNotification