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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
12
Index
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Index

Creational patterns

The final type of design patterns that we will discuss are called creational patterns. These patterns relate to the initialization of new objects. At first, the initialization of an object probably seems simple and not a very important place to have design patterns. After all, we already have initializers. However, in certain circumstances, creational patterns can be extremely helpful.

A singleton/shared instance

The first patterns we will discuss are the singleton and shared instance patterns. We are discussing them together because they are extremely similar. First, we will discuss shared instance because it is the less strict form of the singleton pattern.

The idea of the shared instance pattern is that you provide an instance of your class to be used by other parts of your code. Let's look at a quick example of this in Swift:

class AddressBook {
    static let sharedInstance = AddressBook()

    func logContacts() {
        // ...
    }
}

Here, we have a simple address...

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