Animating constraint values

- [Instructor] For this last section,…we're going to be applying everything we've learned so far…to animate auto layout constraints.…Now in the Storyboard, go ahead and select…the ConstraintAnimationsViewController scene…and set it to the initial view controller.…And while we're here,…let's select the welcome label…and go over to the document outline…and select its center x constraint.…Now make sure that you have the attributes tab open…in the utilities foldout.…Now there are two main ways…to go about animating a constraint.…

If you only need to change one property…like the multiplier or constant,…you can do that directly…just like we've been animating our view properties.…However, if you need to change more than one property…on a given constraint,…you'll have to deactivate the constraint entirely…and replace it with a new one.…The first thing we want to do for this screen…is have our welcome label and our newsletter view…off screen left before the view appears…and then animate them back in when the view does appear.…