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)

Presenting data in a sectioned list with @SectionedFetchRequest

Sometimes, a planned List View isn't enough to present a set of values. Depending on the type of data to be presented, you may need to show them in sections. Think, for example, of a settings list where the settings are aggregates for types of settings; or a list of contacts, where the contacts are aggregated into sections for the surname initial.

SwiftUI provides a mechanism for fetching objects from Core Data storage that's already been aggregated into sections, allowing it to easily be presented in a sectioned List View.

In this recipe, we'll implement a list of contacts where the contacts are grouped into sections, depending on the initial of their surname.

Getting ready

Create a SwiftUI app called SectionedContacts.

Before we start this recipe, complete Steps 1 to 7 of the Showing Core Data objects with @FetchRequest recipe. Then, you can complete this recipe.

How to do it…

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