Book Image

SwiftUI Cookbook - Second Edition

By : Giordano Scalzo, Edgar Nzokwe
Book Image

SwiftUI Cookbook - Second Edition

By: Giordano Scalzo, Edgar Nzokwe

Overview of this book

SwiftUI provides an innovative and simple way to build beautiful user interfaces (UIs) for all Apple platforms, from iOS and macOS through to watchOS and tvOS, using the Swift programming language. In this recipe-based cookbook, you’ll cover the foundations of SwiftUI as well as the new SwiftUI 3 features introduced in iOS 15 and explore a range of essential techniques and concepts that will help you through the development process. The cookbook begins by explaining how to use basic SwiftUI components. Once you’ve learned the core concepts of UI development, such as Views, Controls, Lists, and ScrollViews, using practical implementations in Swift, you'll advance to adding useful features to SwiftUI using drawings, built-in shapes, animations, and transitions. You’ll understand how to integrate SwiftUI with exciting new components in the Apple development ecosystem, such as Combine for managing events and Core Data for managing app data. Finally, you’ll write iOS, macOS, and watchOS apps by sharing the same SwiftUI codebase. By the end of this SwiftUI book, you'll have discovered a range of simple, direct solutions to common problems encountered when building SwiftUI apps.
Table of Contents (17 chapters)

Integrating Core Data with SwiftUI

Over the years, you may have found different ways of using Core Data in your apps from an architectural point of view. For example, Apple, pre-iOS14, provided Xcode templates that created the Core Data containers in AppDelegate. Other developers prefer to wrap Core Data inside manager classes, abstracting Core Data entirely, while encapsulating the whole Core Data Stack and managed objects in a module, so that it's easy to move to another solution, such as Realm, if needed.

SwiftUI's integration, however, points firmly in one direction: create the container when the app starts, inject it into Environment, and then use it to fetch data or make changes.

When building a new app with Xcode, you can check the Use Core Data checkbox so that Xcode creates a template that injects the Core Data stack in the most efficient way possible.

Although the template provided by Xcode is quite complete and powerful, it is unnecessarily complicated...