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)

Deleting Core Data objects from a SwiftUI view

How can you delete objects from a Core Data repository? Removing objects is almost as important as adding them. In this recipe, we'll learn how to integrate the Core Data delete options into a SwiftUI app.

Getting ready

Let's create a SwiftUI app called DeleteContactsApp, ensuring that we check the Use Core Data checkbox, as shown in the following screenshot:

Figure 11.13 – Creating a SwiftUI app with Core Data

How to do it…

We are going to reuse part of the code provided in the Showing Core Data objects with @FetchRequest recipe. Please refer to that recipe if you want to find out more.

Let's get started:

  1. The first step is to create the Core Data model. To do this, select the DeleteContactsApp.xcdatamodeld file and do the following:

    a. Add a new entity called Contact (1)

    b. Add three string attributes called firstName, lastName, and phoneNumber (2)

    c. Check that Codegen...