The Core iOS Developer’s Cookbook, Fifth Edition

Wrapping the Implementation

Like table views, a page view controller uses a delegate and data source to set the behavior and contents of its presentation. Unlike with table views, it’s simplest to wrap these items into a custom class to hide their details from applications. The code needed to support a page view implementation is rather quirky—but highly reusable. A wrapper lets you turn your attention away from fussy coding details to specific content-handling concerns.

In the standard implementation, the data source is responsible for providing page controllers on demand. It returns the next and previous view controllers in relationship to a given one. The delegate handles reorientation events and animation callbacks, setting the page view ...