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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

Exploring protocols

Protocols are like blueprints that determine what properties or methods an object should have. After you’ve declared a protocol, classes, structures, and enumerations can adopt this protocol and provide their own implementation for the required properties and methods.

Here’s what a protocol declaration looks like:

protocol ProtocolName {
   var readWriteProperty1 {get set}
   var readOnlyProperty2 {get}
   func methodName1()
   func methodName2()
}

Just like classes and structures, protocol names start with an uppercase letter. Properties are declared using the var keyword. You use {get set} if you want a property that can be read from or written to, and {get} if you want a read-only property. Note that you just specify property and method names; the implementation is done within the adopting class, structure, or enumeration.

For more information on protocols, visit: https://docs.swift.org/swift-book/documentation/the-swift...

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