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  • Book Overview & Buying SwiftUI Essentials – iOS 14 Edition
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SwiftUI Essentials – iOS 14 Edition

SwiftUI Essentials – iOS 14 Edition

By : Neil Smyth
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SwiftUI Essentials – iOS 14 Edition

SwiftUI Essentials – iOS 14 Edition

By: Neil Smyth

Overview of this book

Do you want to create iOS apps with SwiftUI, Xcode 12, and Swift 5.3, and want to publish it on the app store? This book helps you achieve these skills with a step-by-step approach. This course first walks you through the steps necessary to set up an iOS development environment together and introduces Swift Playgrounds to learn and experiment with Swift—specifically, the Swift 5.3 programming language. After establishing key concepts of SwiftUI and project architecture, this course provides a guided tour of Xcode in SwiftUI development mode. The book also covers the creation of custom SwiftUI views and explains how these views are combined to create user interface layouts, including the use of stacks, frames, and forms. One of the more important skills you’ll learn is how to integrate SwiftUI views into existing UIKit-based projects and explain the integration of UIKit code into SwiftUI. Finally, the book explains how to package up a completed app and upload it to the app store for publication. Along the way, the topics covered in the book are put into practice through detailed tutorials, the source code for which is also available for download. By the end of this course, you will be able to build your own apps for iOS 14 using SwiftUI and publish it on the app store. The code files for the book can be found here: https://www.ebookfrenzy.com/retail/swiftui-ios14/
Table of Contents (56 chapters)
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56
Index

22. SwiftUI State Properties, Observable, State and Environment Objects

Earlier chapters have described how SwiftUI emphasizes a data driven approach to app development whereby the views in the user interface are updated in response to changes in the underlying data without the need to write handling code. This approach is achieved by establishing a publisher and subscriber binding between the data and the views in the user interface.

SwiftUI offers four options for implementing this behavior in the form of state properties, observable objects, state objects and environment objects, all of which provide the state that drives the way the user interface appears and behaves. In SwiftUI, the views that make up a user interface layout are never updated directly within code. Instead, the views are updated automatically based on the state objects to which they have been bound as they change over time.

This chapter will describe these four options and outline when they should be used...

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