Core Data with SwiftUI Quick Guide

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Core Data with SwiftUI

Swift 5.6 | iOS 15

With this guide, you will learn how to store data in a database with Core Data and the SwiftUI framework. After reading this guide, you will know how to work with the Core Data framework, how to create and manage a database, and how to store, search, and retrieve information from the user's device.

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Description

Quick Guides for Masterminds are excerpts from our best-selling books SwiftUI for Masterminds, UIKit for Masterminds, and HTML5 for Masterminds, providing a cost-effective alternative to getting the information you need.

With this guide, you will learn how to store data in a database with Core Data and the SwiftUI framework. After reading this guide, you will know how to work with the Core Data framework, how to create and manage a database, and how to store, search, and retrieve information from the user's device.

Table of Contents

Core Data

Data Model

Core Data Stack

Managed Objects

Fetch Request

Asynchronous Access

Core Data Application

Previews

Sort Descriptors

Predicates

Delete Objects

Modify Objects

Custom Fetch Requests

Sections

To-Many Relationships

Examples

Download TXT Files - Download Projects

Listing 1: Initializing the Core Data stack from the model

Listing 2: Injecting the context into the environment

Listing 3: Fetching objects from the Persistent Store

Listing 4: Adding new objects to the Persistent Store

Listing 5: Defining a view model for the Core Data objects

Listing 6: Using the values from the view model

Listing 7: Selecting the author

Listing 8: Listing all the authors available

Listing 9: Inserting new authors

Listing 10: Creating a Persistent Store for previews

Listing 11: Accessing the Core Data context from the preview

Listing 12: Sorting the books by title

Listing 13: Sorting books by author and year

Listing 14: Sorting with a lexical comparator

Listing 15: Modifying the sorting criteria

Listing 16: Filtering books by year

Listing 17: Filtering books by author

Listing 18: Creating new predicates to search values in the Persistent Store

Listing 19: Filtering values with predicate keywords

Listing 20: Searching for characters in a string

Listing 21: Deleting objects

Listing 22: Selecting the book to modify

Listing 23: Modifying the values of a managed object

Listing 24: Counting the books available

Listing 25: Counting objects with the count() method

Listing 26: Counting the books of each author

Listing 27: Checking for duplicates

Listing 28: Selecting an author

Listing 29: Listing books by author

Listing 30: Fetching objects for sections

Listing 31: Storing the first letter of the book's title

Listing 32: Modifying the book's first letter

Listing 33: Modifying the book's first letter

Listing 34: Creating a string with the name of the authors from the view model

Listing 35: Showing the list of authors

Listing 36: Assigning multiple authors to a book

Listing 37: Modifying the authors of a book

Listing 38: Selecting multiple authors

Listing 39: Fetching books by author

Listing 40: Systematically removing authors from books

Links

Tutorial Predicates
http://nshipster.com/nspredicate/

Bring Core Data concurrency to Swift and SwiftUI
https://developer.apple.com/videos/play/wwdc2021/10017/

FetchRequest
https://developer.apple.com/documentation/swiftui/fetchrequest/

FetchedResults
https://developer.apple.com/documentation/swiftui/fetchedresults

SectionedFetchRequest
https://developer.apple.com/documentation/swiftui/sectionedfetchrequest

SectionedFetchResults
https://developer.apple.com/documentation/swiftui/sectionedfetchresults

NSPersistentContainer
https://developer.apple.com/documentation/coredata/nspersistentcontainer

NSManagedObjectContext
https://developer.apple.com/documentation/coredata/nsmanagedobjectcontext

NSManagedObject
https://developer.apple.com/documentation/coredata/nsmanagedobject

NSFetchRequest
https://developer.apple.com/documentation/coredata/nsfetchrequest

NSPredicate
https://developer.apple.com/documentation/foundation/nspredicate

SortDescriptor
https://developer.apple.com/documentation/foundation/sortdescriptor/

Resources

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TABLE OF CONTENTS

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