How to offset and animate something that hovers above the keyboard with auto layout constraints

KeyboardOffset.swift

NotificationCenter.default.addObserver(forName: .UIKeyboardWillChangeFrame, object: nil, queue: .main) { [weak self] (notification) in
    guard let strongSelf = self,
        let targetFrame = notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? CGRect,
        let animationCurve = notification.userInfo?[UIKeyboardAnimationCurveUserInfoKey] as? NSNumber,
        let animationDuration = notification.userInfo?[UIKeyboardAnimationDurationUserInfoKey] as? NSNumber else {
            return
        }
    
    strongSelf.view.layoutIfNeeded()
    strongSelf.proceedButtonBottomConstraint.constant = -UIScreen.main.bounds.intersection(targetFrame).height
    UIView.animate(withDuration: TimeInterval(truncating: animationDuration), delay: 0.0,
                   options: UIViewAnimationOptions(rawValue: UInt(truncating: animationCurve)),
                   animations: strongSelf.view.layoutIfNeeded,
                   completion: nil)
}