Preface

Welcome to SwiftUI Fundamentals!

This book distills the core principles and foundational concepts behind SwiftUI, the modern UI framework for building apps across Apple platforms. My goal is to help you go beyond surface-level understanding and develop a deep, practical knowledge of how SwiftUI works under the hood.

SwiftUI provides a simple, declarative way to build user interfaces, but behind that simplicity is a carefully designed architecture that can be tricky to grasp without the right perspective. In this book, we’ll explore the key APIs and design patterns that power SwiftUI, giving you a solid foundation to write more efficient, maintainable, and expressive code.

I’ve been working with SwiftUI since it was first released and later had the privilege of contributing to its development as a member of the core SwiftUI team at Apple, where I helped design and build some of the framework’s most widely used APIs. I wrote this book to share the insights I gained during that time, insights that will help you better understand how SwiftUI is built and how you can use it more effectively in your own projects.

This is not a beginner’s tutorial. It’s written for developers who have already experimented with SwiftUI and have a working knowledge of the Swift language. The examples here are designed to demonstrate how the framework's principles apply in real-world scenarios, equipping you with the understanding you need to solve problems independently and confidently.

SwiftUI is evolving every year, and having a solid grasp of its core principles is the best way to stay ahead. By the end of this book, you’ll not only know how to use SwiftUI, you’ll understand why it works the way it does.