migrating common code to one place

We are getting into object oriented design philosophy here. Describe what those "routines" do in natural language. If the relationship between your two UIViews and the common stuff is "is a", use inheritance to make your two UIView subclasses extend from a common base class. If it's "has a", use composition - move the common functionality into a separate class, an instance of which each of your two UIViews would contain.

A common need, I think - perhaps you'll need those routines in other apps? Maybe your own framework would help...

See http://stackoverflow.com/questions/34252627/create-framework-library-module-of-swift-objects-in-xcode

One approach is to create a singleton 'model' that contains the common methods and call those methods in the singleton.