CoordinateThis

This iOS app demonstrates the Coordinator design pattern using both traditional Delegation and RxSwift / RxCocoa as internal communication mechanisms.

Architecture

The app is composed of 3 independent UIViewController classes and a Controller class. The 3 UIViewControllers display 3 different app state:

Loading Screen
Master Screen
Detail Screen

The Controller class, called AppController, is reponsible for moving the app through it’s different defined states by reponding to events from the app.

Functionality

It is a purposely simple app that mirrors the usual Loading-Master-Detail flow of many apps today. At start time the Loading Screen is displayed and after 2 seconds elapse it notifies the AppCoordinator which then displays the Master Screen. The Master Screen consists of a single button that loads a Detail Screen via the AppCoordinator. From the Detail Screen there are 3 different ways (Navigation Controller back button, Button via Delegation and Button via Rx) to return to the Master Screen. Note that the Button via Rx is only implemented as of v1.0-rx and is the only Rx implementation in the app.

Build Instructions

Delegation Only

Checkout tag v1.0
Open CoordinateThis.xcodeproj using Xcode 9.4.1.

RxSwift / RxCoca

Checkout tag v1.0-rx
Install RxSwift and RxCocoa using Cocoapods
Open CoordinateThis.xcworkspace using Xcode 9.4.1

Observations

RxSwift / RxCocoa reduces boilerplate code required to support Delegation. Specifically it removes:
- Protocols
- Class implementation definitions
- Class implementation of methods
RxSwift / RxCocoa makes it easier to follow implementation of event listeners and functionality
App Size only goes from 2.4 MB (No libraries) to 3 MB (with RxSwift and RxCocoa) when compiled as distributable .ipa files.