MVVM-C Architecture with Dependency Injection + Testing

A complete example

Photo by Jonathan Riley on Unsplash

I’ve been using MVVM-C for quite some time. I’m sure you (probably, I don’t know you) agree that by abstracting the navigation away from the main MVVM architecture code gives you the opportunity for testing. Great!

What if you have multiple dependencies? How are these going to be injected into your…wait.. where…what?

Making this clear is the goal of this article.

Difficulty: Beginner | Easy | Normal | Challenging

This article has been developed using Xcode 11.4.1, and Swift 5.2.2

Prerequisites:

• You will be expected to be aware how to make a Single View Application in Swift.
• Some experience of architecture patterns are required, whether MVC or MVVM.
• The principles of Dependency Injection are explained in this article, but some in-depth explanation always helps!
• You’ll need to be comfortable with protocols

Terminology:

Factory Pattern: A design pattern where an object is created without exposing the creation logic to the client. The factory pattern lets a class defer instantiation to subclasses.