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Dependency injection is surprisingly easy with Swift since you can implement it with protocol extensions. You don't need a framework or anything:

http://www.danielhall.io/a-swift-y-approach-to-dependency-in...

I don't have a link to a good example but I have used https://github.com/Swinject/Swinject in the past and it really helps get the job done. You can over do it a bit though as with anything.

http://aplus.rs/2017/highly-maintainable-app-architecture/