Updating the animation manager

- [Instructor] It's always a good idea…to keep as much of your animation code…separated out from your view controller as possible.…With that in mind,…let's take a shot at updating our AnimationManager…with some procedural code…to handle a view controller's initial setup.…Go ahead and open up the AnimationManager.swift file…and underneath our screen positioning variables,…let's make ourselves some room…and declare a new init function.…This initializer is going to take in…an array of NSLayoutConstraints.…We're going to call this activeConstraints.…

We'll just do open and close curly braces.…Now the idea here is to have any views…we want to position off screen…and viewWillAppear happen automatically…without having to manually code it…each time in each view controller.…And before we do any of that,…we need some variables to help us keep track…of each constraint's original position…and an array of all current constraints…on a specific manager instance.…So right above the init,…I'm going to add in a comment called Tracking variables…