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iOS 17 Programming for Beginners - Eighth Edition

You're reading from  iOS 17 Programming for Beginners - Eighth Edition

Product type Book
Published in Oct 2023
Publisher Packt
ISBN-13 9781837630561
Pages 604 pages
Edition 8th Edition
Languages
Author (1):
Ahmad Sahar Ahmad Sahar
Profile icon Ahmad Sahar

Table of Contents (34) Chapters

Preface 1. Part 1: Swift
2. Exploring Xcode 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

Functions and Closures

At this point, you can write reasonably complex programs that can make decisions and repeat instruction sequences. You can also store data for your programs using collection types. As the programs you write grow in size and complexity, it will become harder to comprehend what they do.

To make large programs easier to understand, Swift allows you to create functions, which let you combine several instructions together and execute them by calling a single name. You can also create closures, which let you combine several instructions together without a name and assign them to a constant or variable.

By the end of this chapter, you’ll have learned about functions, nested functions, functions as return types, functions as arguments, and the guard statement. You’ll also have learned how to create and use closures.

The following topics will be covered in this chapter:

  • Exploring functions
  • Exploring closures
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