DubDub17

A sample project based on the WWDC App for learning Coordinator and Model View ViewModel (MVVM) design patterns in iOS and Swift 3.

Solving a Problem

'Massive View Controllers' are a thing. An elegant and testable way to avoid this is using the coordinator pattern.

A coordinator is way to lift a number of tasks up and outside of a view controller.
View controllers should know nothing about their parent or sibling view controllers.
Each view controller manages the views inside in a trivial manner.
When a view controller has distinct states, it switches on them using an enum.
A view controller (when appropriate) provides a delegate so a coordinator can react to the steps in a given workflow, while still keeping the view controller in the dark.

This app is based on the awesome WWDC app that Apple updates each year.

Services like Videos, Schedule, News, and Venue are all represented in the app as coordinators.
If there are smaller workflows (e.g. providing feedback, picking a photo) their may be child coordiantors.
Each coordinator has a single start() method.

This is a great example for working with a complex data set, calendars, video, and location services all in one place.

This is a work in progress. Trying to make it happen by the end of WWDC week!