iOS Development with SwiftUI' focuses on teaching and practicing the use of SwiftUI for developing iOS applications that leverage the latest iOS features.

To begin, the book covers the fundamentals of SwiftUI and its core functionalities and how to write UI without having to worry much about it. It explains the fundamental Swift syntax, data types, control statements, functions, classes, and structures, as well as methods, protocols, and closures. The book covers expert tips for adding animations with a single line of code, as well as some SwiftUI transitions. Then, through a dissection of an iOS application, it teaches how to create APIs and implement API calls. It also covers widgets, App Clip development, web banner creation, and how the app communicates with the App Clip.

The book will help demonstrate how to integrate XCTest into your application for both UI and unit testing and how to write your test case and prepare the application for general use.

At the end of the book, you will be able to write an iOS application in SwiftUI and gain some experience to call API or web services using combine.