func moveWithKeyboard()

in SampleApp/BaseUI.swift [35:58]
20 lines of code
2 McCabe index (conditional complexity)

    func moveWithKeyboard(in view: UIView) -> AnyObject {
        return NotificationCenter
            .default
            .addObserver(forName: UIResponder.keyboardWillChangeFrameNotification,
                         object: nil,
                         queue: nil) { [weak view] (note) in
                            // TODO: this makes a lot of assumptions about where we are on screen
                            // and what's in the dictionary. This should be factored out into a
                            // keyboard layout guide.
                            if let userInfo = note.userInfo,
                                let finalFrame = userInfo[AnyHashable(UIWindow.keyboardFrameEndUserInfoKey)] as? CGRect,
                                let rawCurve = userInfo[UIWindow.keyboardAnimationCurveUserInfoKey] as? Int,
                                let curve = UIView.AnimationCurve(rawValue: rawCurve),
                                let duration = userInfo[UIWindow.keyboardAnimationDurationUserInfoKey] as? TimeInterval {
                                view?.layoutIfNeeded()
                                UIViewPropertyAnimator(duration: duration, curve: curve, animations: {
                                    self.constant = -finalFrame.height
                                    view?.layoutIfNeeded()
                                })
                                    .startAnimation()
                            }
        }

    }