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18,916 PointsHow to understand "func keyboardWillShow(_ notification: Notification)" be called in the selector without parameter?
I know in the #selector()
we just have to pass in the name of the method we're calling, but how can keyboardWillShow(_ notification: Notification)
know the notification
without giving any clue?
NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillShow), name: Notification.Name.UIKeyboardWillShow, object: nil)
the code above can send the exact notification
to the function keyboardWillShow()
?!
Or just because the #selector(self.keyboardWillShow)
can grab the notification
since it knows this comes from UIKeyboardWillShow
?!