SwiftUI Essentials - iOS Edition

Neil Smyth

• Publisher: Packt Publishing
• Year: 2018
• ISBN:
  9781951442064
• Edition: 1
• Topic: Computer Science
• Subtopic: Programming Mobile Devices
• Index: Computer Science

Learn the ropes of application development for iOS 13Key Features• Take a guided tour of Xcode in SwiftUI development mode• Delve deep into Swift 5 with control flow, property wrappers, error handling, and more• Work with UI design concepts such as modifiers, tabbed views, and UI navigationBook DescriptionBeginning with the basics, this book provides an outline of the steps necessary to set up an iOS development environment and introduces you to Swift Playgrounds so that you can learn and experiment with Swift.You'll begin with an introduction to the key concepts of SwiftUI and its architecture. You'll learn how to create custom SwiftUI views and combine them to create user interface layouts including how to use stacks, frames, and forms. As you progress, you'll learn how to handle data using state properties. You'll also learn how to use graphics, animation, transitions, and gestures in your user interface. The book finishes by explaining how to package an application and upload it to the App Store for publication.By the end of the book, you'll have all the necessary skills to develop your own applications for iOS 13 with SwiftUI, Swift 5, and Xcode 11.What you will learn• Install and configure Xcode 11• Draw 2D graphics• Work with SwiftUI views and subviews• Integrate SwiftUI views into existing UIKit-based projects• Design data-driven applications• Master the declarative syntax of SwiftUIWho This Book Is ForSwiftUI Essentials - iOS Edition is ideal for UI developers who want to use SwiftUI and Swift 5 to their advantage and improve their user interfaces. Some experience in UI development will help you easily understand the concepts explained in this book.

1. Start Here

The goal of this book is to teach the skills necessary to build iOS 13 applications using SwiftUI, Xcode 11 and the Swift 5 programming language.

Beginning with the basics, this book provides an outline of the steps necessary to set up an iOS development environment together with an introduction to the use of Swift Playgrounds to learn and experiment with Swift.

The book also includes in depth chapters introducing the Swift 5 programming language including data types, control flow, functions, object-oriented programming, property wrappers and error handling.

An introduction to the key concepts of SwiftUI and project architecture is followed by 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.

Other topics covered include data handling using state properties and both observable and environment objects, as are key user interface design concepts such as modifiers, lists, tabbed views, context menus and user interface navigation.

The book also includes chapters covering graphics drawing, user interface animation, view transitions and gesture handling.

Chapters are also provided explaining how to integrate SwiftUI views into existing UIKit-based projects and explains 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.

The aim of this book, therefore, is to teach you the skills necessary to build your own apps for iOS 13 using SwiftUI. Assuming you are ready to download the iOS 13 SDK and Xcode 11 and have an Intel-based Mac you are ready to get started.

1.1 For Swift Programmers

This book has been designed to address the needs of both existing Swift programmers and those who are new to both Swift and iOS app development. If you are familiar with the Swift 5.1 programming language, you can probably skip the Swift specific chapters. If you are not yet familiar with the new language features of Swift 5.1, however, we recommend that you at least read the sections covering implicit returns from single expressions, opaque return types and property wrappers. These features are central to the implementation and understandin...

Table of contents

• 1. Start Here. 1
• 2. Joining the Apple Developer Program.. 3
• 3. Installing Xcode 11 and the iOS 13 SDK. 7
• 4. An Introduction to Xcode 11 Playgrounds. 11
• 5. Swift Data Types, Constants and Variables. 25
• 6. Swift Operators and Expressions 39
• 7. Swift Control Flow.. 49
• 8. The Swift Switch Statement 57
• 9. An Overview of Swift 5 Functions, Methods and Closures 63
• 10. The Basics of Object-Oriented Programming in Swift 75
• 11. An Introduction to Swift Subclassing and Extensions 87
• 12. An Introduction to Swift Structures. 93
• 13. An Introduction to Swift Property Wrappers 97
• 14. Working with Array and Dictionary Collections in Swift 103
• 15. Understanding Error Handling in Swift 5. 111
• 16. An Overview of SwiftUI 117
• 17. Using Xcode in SwiftUI Mode. 121
• 18. The Anatomy of a Basic SwiftUI Project 141
• 19. Creating Custom Views with SwiftUI 145
• 20. SwiftUI Stacks and Frames 157
• 21. Working with SwiftUI State, Observable and Environment Objects 169
• 22. A SwiftUI Example Tutorial 177
• 23. SwiftUI Observable and Environment Objects – A Tutorial 191
• 24. SwiftUI Stack Alignment and Alignment Guides. 199
• 25. SwiftUI Lists and Navigation. 217
• 26. A SwiftUI List and Navigation Tutorial 227
• 27. Building Tabbed Views in SwiftUI 243
• 28. Building Context Menus in SwiftUI 247
• 29. Basic SwiftUI Graphics Drawing. 251
• 30. SwiftUI Animation and Transitions 261
• 31. Working with Gesture Recognizers in SwiftUI 273
• 32. Integrating UIViews with SwiftUI 281
• 33. Integrating UIViewControllers with SwiftUI 291
• 34. Integrating SwiftUI with UIKit 299
• 35. Preparing and Submitting an iOS 13 Application to the App Store. 311
• An Introduction to Swift Playgrounds
• Working with Array and Dictionary Collections in Swift
• The Swift Switch Statement
• Swift Control Flow
• The Basics of Object-Oriented Programming in Swift
• Creating Custom Views with SwiftUI
• Integrating UIViews with SwiftUI
• Installing Xcode 11 and the iOS 13 SDK
• SwiftUI Stacks and Frames
• Joining the Apple Developer Program
• An Overview of Swift 5 Functions, Methods and Closures
• SwiftUI Stack Alignment and Alignment Guides
• A SwiftUI Example Tutorial
• SwiftUI Observable and Environment Objects – A Tutorial
• SwiftUI Lists and Navigation
• The Anatomy of a Basic SwiftUI Project
• SwiftUI Animation and Transitions
• Working with SwiftUI State, Observable and Environment Objects
• A SwiftUI List and Navigation Tutorial
• Integrating UIViewControllers with SwiftUI
• Integrating SwiftUI with UIKit