About This Book
This book is about application architecture: the structures and tools used to bring
smaller components together to form an application. Architecture is an important topic
in app development since apps typically integrate a large number of diverse
components: user events, network services, file services, audio services, graphics and
windowing services, and more. Integrating these components while ensuring state and
state changes are reliably and correctly propagated between them requires a strong set
of rules about how the components should interoperate.
Application Design Patterns
Sets of repeatedly applied design rules are called design patterns, and in this book, we
will present an application that’s fully implemented in five major application design
patterns, which range from well established to experimental. These are:
→ Model-View-Controller (MVC)
→ Model-View-ViewModel+Coordinator (MVVM-C)
→ Model-View-Controller+ViewState (MVC+VS)
→ ModelAdapter-ViewBinder (MAVB)
→ The Elm Architecture (TEA)
The abstract block diagrams commonly used to describe application design patterns at
the highest level do little to describe how these patterns are applied to iOS applications.
To see what the patterns are like in practice, we’ll take a detailed look at typical program
flows in each of them.
We’ll also look at a range of different patterns to show that there is no single best
approach for writing programs. Any of the patterns could be the best choice depending
upon the goals, desires, and constraints of you, your program, and your team.
Application design patterns are not just a set of technical tools; they are also a set of
aesthetic and social tools that communicate your application to you and to other readers
of your code. As such, the best pattern is often the one that speaks most clearly to you.
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