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  • Book Overview & Buying Learning Swift
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Learning Swift

Learning Swift

By : Andrew J Wagner
4.8 (5)
Buy this Book
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Learning Swift

Learning Swift

4.8 (5)
By: Andrew J Wagner
Buy this Book

Overview of this book

If you are looking to build iOS or OS X apps using the most modern technology, this book is ideal for you. You will find this book especially useful if you are new to programming or if you have yet to develop for iOS or OS X.
Table of Contents (13 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
Free Chapter
1
1. Introducing Swift
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1. Introducing Swift
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Defining our goals for this book
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Setting up the development environment
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Running our first Swift code
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Understanding playgrounds
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Learning with this book
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Summary
2
2. Building Blocks – Variables, Collections, and Flow Control
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2. Building Blocks – Variables, Collections, and Flow Control
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Core Swift types
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Swift's type system
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Printing on the console
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Control flow
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Functions
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Bringing it all together
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Summary
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3. One Piece at a Time – Types, Scopes, and Projects
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3. One Piece at a Time – Types, Scopes, and Projects
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Structs
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Classes
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Enumerations
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Projects
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Extensions
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Scope
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Access control
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Summary
4
4. To Be or Not to Be – Optionals
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4. To Be or Not to Be – Optionals
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Introducing optionals
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Unwrapping an optional
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Optional chaining
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Implicitly unwrapped optionals
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Debugging optionals
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The underlying implementation
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Summary
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5. A Modern Paradigm – Closures and Functional Programming
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5. A Modern Paradigm – Closures and Functional Programming
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Functional programming philosophy
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Closures
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Building blocks of functional programming in Swift
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Lazy evaluation
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Curried functions
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Summary
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6. Make Swift Work for You – Protocols and Generics
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6. Make Swift Work for You – Protocols and Generics
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Protocols
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Defining a generic
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Extending the existing generics
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Putting protocols and generics to use
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Summary
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7. Everything is Connected – Memory Management
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7. Everything is Connected – Memory Management
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How data is stored in a computer
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Value types versus reference types
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Automatic reference counting
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Strong reference cycles
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Lost objects
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Summary
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8. Writing Code the Swift Way – Design Patterns and Techniques
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8. Writing Code the Swift Way – Design Patterns and Techniques
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What is a design pattern?
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Behavioral patterns
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Structural patterns
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Creational patterns
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Using associated values effectively
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Extending system types to reduce code
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Lazy properties
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Summary
9
9. Harnessing the Past – Understanding and Translating Objective-C
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9. Harnessing the Past – Understanding and Translating Objective-C
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Swift's relationship with Objective-C
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The history of Objective-C
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Constants and variables
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Containers
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Control flow
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Functions
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Types
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Projects
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Calling Objective-C code from Swift
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Using functions
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Summary
10
10. A Whole New World – Developing an App
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10. A Whole New World – Developing an App
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Conceptualizing the app
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Setting up the app project
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Configuring the user interface
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Running the app
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Allowing picture taking
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Temporarily saving a photo
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Populating our photo grid
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Refactoring to respect Model-View-Controller
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Permanently saving a photo
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Summary
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11. What's Next? Resources, Advice, and Next Steps
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11. What's Next? Resources, Advice, and Next Steps
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Apple's documentation
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Forums and blogs
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Prominent figures
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Podcasts
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Summary
12
Index
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Index

Protocols

The first tool we will look at is protocols. A protocol is essentially a contract that a type can sign saying that it will provide a certain interface to other components. This relationship is significantly weaker than the relationship a subclass has with its superclass. A protocol does not have its own implementation. Instead, a type can implement the protocol in any way they like.

Let's take a look at how we define a protocol so that we can understand them better.

Defining a protocol

Let's say we have some code that needs to interact with a collection of strings. We don't actually care what order they are stored in and we only need to be able to add and enumerate the elements inside the container. One option to do this would be to simply use an array, but an array does way more than we need it to. What if we decide later that we would rather write and read the elements from the filesystem? Furthermore, what if we want to write a container that would intelligently...

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