Animating via constraint toggle?

[winstondu]

Currently, with UIView.animate, it is possible to do an animation through a constraint toggle.
For example, if we have an object rect, and we have two layout constraints on its location, constrainRectToTop and constrainRectToTop, we can do as follows:

UIView.animate(withDuration: 0.35, delay: 0.35, animations: {
                    self.constrainRectToTop.isActive = false
                    self.constrainRectToBottom.isActive = true
                    self.view.layoutIfNeeded()
                }

What would be a general way of accomplishing this using MotionMachine?