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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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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 JournalListViewController class

Previously, when you added or removed journal entries from your app, the changes made would be gone when you stopped and ran the app again because the code in the JournalListViewController class had no way to save app data to your device. You will add code to the JournalListViewController class to save app data using SwiftData in this section.

You will update the viewDidLoad() method to fetch all journal entries from device storage when you run the app, update the unwindNewEntrySave(segue:) method to add a new journal entry to the ModelContext instance, and update the tableView(_:commit:forRowAt:) method to remove the specified journal entry from the ModelContext instance. Follow these steps:

  1. Click the JournalListViewController file in the Project navigator, and add a method to fetch all journal entries from device storage before the closing curly brace:
    func getJournalEntries() {
      sampleJournalEntryData.journalEntries...
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