Book Image

Learn SwiftUI

By : Chris Barker
Book Image

Learn SwiftUI

By: Chris Barker

Overview of this book

SwiftUI is the new and powerful interface toolkit that lets you design and build iOS, iPadOS, and macOS apps using declarative syntax. It is a powerful way to develop the UI elements of applications, which would normally be tightly coupled to application logic. Learn SwiftUI will get you up to speed with the framework and cross-device UI development in no time. Complete with detailed explanations and practical examples, this easy-to-follow guide will teach you the fundamentals of the SwiftUI toolkit. You'll learn how to build a powerful iOS and iPadOS application that can be reused for deployment on watchOS. As you progress, you'll delve into UI and unit testing in iOS apps, along with learning how to test your SwiftUI code for multiple devices. The book will also show you how to integrate SwiftUI features such as data binding and network requests into your current application logic. By the end of this book, you will have learned how to build a cross-device application using the SwiftUI framework and Swift programming.
Table of Contents (17 chapters)

Accessing with @EnvironmentObject

Previously passing objects between views (or more specifically ViewControllers) could get a bit tricky, whilst the delegate pattern was a solid tried and tested method, passing data backup through multiple layers could get a little repetitive and in some cases complicated.

However with SwiftUI, and the use of EnvironmentObject, we don't need to worry about that anymore, as we'll learn in this next section we can take an object at the very top of our hierarchy and use this as deep as we need to within our Views; it's a global object which is accessible everywhere.

Adding and injecting the @EnvironmentObject class

To begin with, we'll need to create a class that can conform...