Book Image

SwiftUI Essentials – iOS 14 Edition

By : Neil Smyth
Book Image

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)
56
Index

16.1 UIKit and Interface Builder

To understand the meaning and advantages of SwiftUI’s declarative syntax, it helps to understand how user interface layouts were designed before the introduction of SwiftUI. Up until the introduction of SwiftUI, iOS apps were built entirely using UIKit together with a collection of associated frameworks that make up the iOS Software Development Kit (SDK).

To aid in the design of the user interface layouts that make up the screens of an app, Xcode includes a tool called Interface Builder. Interface Builder is a powerful tool that allows storyboards to be created which contain the individual scenes that make up an app (with a scene typically representing a single app screen).

The user interface layout of a scene is designed within Interface Builder by dragging components (such as buttons, labels, text fields and sliders) from a library panel to the desired location on the scene canvas. Selecting a component in a scene provides access to...