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Learning Swift Second Edition

Learning Swift Second Edition

By : Andrew J Wagner
5 (1)
Buy this Book
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Learning Swift Second Edition

Learning Swift Second Edition

5 (1)
By: Andrew J Wagner
Buy this Book

Overview of this book

Swift is Apple’s new programming language and the future of iOS and OS X app development. It is a high-performance language that feels like a modern scripting language. On the surface, Swift is easy to jump into, but it has complex underpinnings that are critical to becoming proficient at turning an idea into reality. This book is an approachable, step-by-step introduction into programming with Swift for everyone. It begins by giving you an overview of the key features through practical examples and progresses to more advanced topics that help differentiate the proficient developers from the mediocre ones. It covers important concepts such as Variables, Optionals, Closures, Generics, and Memory Management. Mixed in with those concepts, it also helps you learn the art of programming such as maintainability, useful design patterns, and resources to further your knowledge. This all culminates in writing a basic iOS app that will get you well on your way to turning your own app ideas into reality.
Table of Contents (14 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 to 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
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4. To Be or Not To Be – Optionals
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4. To Be or Not To Be – Optionals
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Defining an optional
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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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Example
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Summary
6
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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Generics
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Extending generics
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Putting protocols and generics to use
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Summary
7
7. Everything Is Connected – Memory Management
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7. Everything Is Connected – Memory Management
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Computer data storage
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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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Structures versus classes
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Summary
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8. Paths Less Traveled – Error Handling
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8. Paths Less Traveled – Error Handling
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Throwing errors
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Handling errors
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Cleaning up in error situations
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Summary
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9. Writing Code the Swift Way – Design Patterns and Techniques
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9. 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
10
10. Harnessing the Past – Understanding and Translating Objective-C
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10. Harnessing the Past – Understanding and Translating Objective-C
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Swift's relationship to Objective-C
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Background 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
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11. A Whole New World – Developing an App
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11. 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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12. What's Next? – Resources, Advice, and the Next Steps
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12. What's Next? – Resources, Advice, and the 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

Creational patterns

The final type of design patterns we will discuss is 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.

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 book class...

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