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iOS 17 Programming for Beginners

You're reading from   iOS 17 Programming for Beginners Unlock the world of iOS development with Swift 5.9, Xcode 15, and iOS 17 – your path to App Store success

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Product type Paperback
Published in Oct 2023
Publisher Packt
ISBN-13 9781837630561
Length 604 pages
Edition 8th Edition
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Authors (2):
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Ian Lockett Ian Lockett
Author Profile Icon Ian Lockett
Ian Lockett
Ahmad Sahar Ahmad Sahar
Author Profile Icon Ahmad Sahar
Ahmad Sahar
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Toc

Table of Contents (34) Chapters Close

Preface 1. Part 1: Swift
2. Exploring Xcode FREE CHAPTER 3. Simple Values and Types 4. Conditionals and Optionals 5. Range Operators and Loops 6. Collection Types 7. Functions and Closures 8. Classes, Structures, and Enumerations 9. Protocols, Extensions, and Error Handling 10. Swift Concurrency 11. Part 2: Design
12. Setting Up the User Interface 13. Building Your User Interface 14. Finishing Up Your User Interface 15. Modifying App Screens 16. Part 3: Code
17. Getting Started with MVC and Table Views 18. Getting Data into Table Views 19. Passing Data between View Controllers 20. Getting Started with Core Location and MapKit 21. Getting Started with JSON Files 22. Getting Started with Custom Views 23. Getting Started with the Camera and Photo Library 24. Getting Started with Search 25. Getting Started with Collection Views 26. Part 4: Features
27. Getting Started with SwiftData 28. Getting Started with SwiftUI 29. Getting Started with Widgets 30. Getting Started with visionOS 31. Testing and Submitting Your App to the App Store 32. Other Books You May Enjoy
33. Index

Modifying the JournalEntry class

Currently, when you create a new journal entry using the Add New Journal Entry screen and click the Save button, the entry will appear on the Journal List screen:

Figure 23.1: Simulator showing new entries added to the Journal List screen

If you quit and restart your app, the newly added entries will disappear:

Figure 23.2: Simulator showing new entries disappear after the app is relaunched

This is because the contents of the journalEntries array are only kept in memory and not saved to device storage when the app is closed. To resolve this, you will implement SwiftData for your app. The first step in implementing SwiftData is to create model objects from your existing JournalEntry class, modifying this and other classes in your app as needed. Follow these steps:

  1. In the Project navigator, click the JournalEntry file (located in the Journal List Scene | Model group). Import the SwiftData framework and annotate the...
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