Book Image

SwiftUI Cookbook

By : Giordano Scalzo, Edgar Nzokwe
Book Image

SwiftUI Cookbook

By: Giordano Scalzo, Edgar Nzokwe

Overview of this book

SwiftUI is an innovative and simple way to build beautiful user interfaces (UIs) for all Apple platforms, right from iOS and macOS through to watchOS and tvOS, using the Swift programming language. In this recipe-based book, you’ll work with SwiftUI and explore a range of essential techniques and concepts that will help you through the development process. The recipes cover the foundations of SwiftUI as well as the new SwiftUI 2.0 features introduced in iOS 14. Other recipes will help you to make some of the new SwiftUI 2.0 components backward-compatible with iOS 13, such as the Map View or the Sign in with Apple View. The cookbook begins by explaining how to use basic SwiftUI components. Then, you’ll learn the core concepts of UI development such as Views, Controls, Lists, and ScrollViews using practical implementation in Swift. By learning drawings, built-in shapes, and adding animations and transitions, you’ll discover how to add useful features to the SwiftUI. When you’re ready, 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 while 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 found in building SwiftUI apps.
Table of Contents (15 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, using Apple with the Xcode templates proposed to create containers in AppDelegate so that you can use them when needed, other templates wrapped with Core Data inside manager classes, and so on. However, others prefer abstracting Core Data entirely 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 our 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.

Even though this is the way we usually do this, in this recipe, we'll introduce Core Data manually in a SwiftUI project...