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- app architecture hero original 5eb5209c - Our New Book: App Architecture (Early Access)

“Most writing about architecture tries to sell you on a specific solution. We believe almost any architecture can work well, if applied correctly.” — Chris Eidhof

Today, we’re pleased to announce early to our new :

App Architecture — by Chris Eidhof, Matt Gallagher, and Florian Kugler.

Born from a “hallway track” conversation with Matt Gallagher, at a conference in early 017, the book started life with the working title “A Hundred Different Ways to Write an iOS App”. Most discussions of app architecture begin with an attempt to sell you on a specific pattern, but we agreed with Matt that any architecture can work well, if applied correctly. What’s more, “correctly” is a relative term: it depends on your team, your code base, your experience, and your preferences.

Between Melbourne and Berlin, we set to work.

Instead of advocating for particular patterns, this book lays out the problems all architectures are trying to address: constructing the app’s components, communicating between the view and the model, and handling non-model state.

Using a single example app, we implement the same specification in six different architectural patterns, three commonly used and three experimental patterns (full source code included). We show high-level solutions to these problems, breaking each pattern down to understand how it is implemented at the level of code.

Our three common architectures are Model-View-Controller (MVC), Online-Only MVC, and Model-View-ViewModel + Coordinator (MVVM-C). Common architectures have commonly encountered problems, and we discuss techniques and solutions specific to each pattern.

On the experimental side, we explain View-State-Driven MVC, ModelAdaptor-ViewBinder, and the Elm architecture. By examining these experimental patterns, we extract valuable lessons that can be applied to other patterns, and to existing code bases.

After reading about new architectures, it’s tempting to start over, to build with a clean slate. This isn’t necessary. Many lessons from our book can be applied to existing applications, in both Swift and Objective-C. You can improve the handling of view-state, use reducers to simplify code, refactor large view controllers, achieve unidirectional flow in MVC, and much more with the code you already have.

Our book helps you make well-informed decisions about all of these options by showing how different architectures work, and how you can combine different elements to build applications that suit the context of your work.

By the end, you should have a thorough understanding of the commonalities, differences, and trade-offs between architectures, and how you can best implement them to fit your specific needs.

Watch us discuss the book in our introduction video.

Early Access

We are releasing the book in chapters. The first chapter is available now, with updates and new content added weekly until publication is complete.

Early access also includes:

  • A private GitHub repository with markdown and PDF
  • Complete source code for all six architectures
  • The opportunity to file issues and ask questions
  • An exclusive weekly video Q&A

With Video

New this year, readers have the option to purchase the book with video, which includes over 8 hours of in-depth discussion covering all six architectural patterns, and additional live-coding of new features. The videos are exclusive to the Ebook + Video edition, and will remain separate from our Swift Talk series.

The videos and final book will be released in April , with a separate paperback edition following shortly after.

Readers can purchase early access directly from our website.

We look forward to hearing your questions!

Best from Berlin, and Melbourne. 🐨

Chris, Matt, and Florian.



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