What is the iPhone's default keyboard animation rate?

Question

A while ago I remember seeing a constant of some kind that defined the animation rate of the Keyboard on the iPhone and I can not for the life of me remember where I saw it.

Answer 1

Swift 4 - worked for me:

        if let duration = notification.userInfo?[UIKeyboardAnimationDurationUserInfoKey] as? Double {
            UIView.animate(withDuration: duration, animations: {
                self.view.layoutIfNeeded()
            })
        }

In debug mode my duration was 3.499999