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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
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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
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Index
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Index

Using associated values effectively

Good programming is about more than just grand, universal concepts of how to write effective code. The best programmers know how to play to the strengths of the tools at hand. We will now move from the core tenants of programming design to some of the gritty details of how to enhance your code with the power of Swift.

The first thing we will look at is how to make effective use of the associated value of an enumeration. Associated values are pretty unique features of Swift, so they open up some pretty interesting possibilities.

Replacing class hierarchies

We already saw in Chapter 3, One Piece at a Time – Types, Scopes, and Projects that we can use an enumeration with associated values to represent a measurement like distance in multiple measurement systems:

enum Height {
    case Imperial(feet: Int, Inches: Double)
    case Metric(meters: Double)
    case Other(String)
}

We can generalize this use case using an enumeration to flatten out a simple class hierarchy...

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