Book Image

Mastering Swift 3

Book Image

Mastering Swift 3

Overview of this book

Swift is the definitive language of Apple development today. It’s a vital part of any iOS and OS X developer’s skillset, helping them to build the most impressive and popular apps on the App Store—the sort of apps that are essential to iPhone and iPad users every day. With version 3.0, the Swift team have added new features to improve the development experience—making it easier to get the results you want and customers expect. Inside, you’ll find the key features of Swift 3.0 and quickly learn how to use the newest updates to your development advantage. From Objective-C interoperability to ARC, to closures and concurrency, this advanced Swift guide will develop your expertise and make you more fluent in this vital programming language. We give you in-depth knowledge of some of the most sophisticated elements of Swift development including protocol extensions, error-handling, design patterns, and concurrency, and guide you on how to use and apply them in your own projects. You'll see how even the most challenging design patterns and programming techniques can be used to write cleaner code and to build more performant iOS and OS X applications. By the end of this book, you’ll have a handle on effective design patterns and techniques, which means you’ll soon be writing better iOS and OS X applications with a new level of sophistication and control.

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Table of Contents (23 chapters)
Mastering Swift 3
Mastering Swift 3
Credits
Credits
About the Author
About the Author
About the Reviewer
About the Reviewer
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Taking the First Steps with Swift
Taking the First Steps with Swift
What is Swift?
Playgrounds
Hello World
Summary
2
Learning About Variables, Constants, Strings, and Operators
Learning About Variables, Constants, Strings, and Operators
Constants and variables
Operators
Summary
3
Using Swift Collections and the Tuple Type
Using Swift Collections and the Tuple Type
Swift collection types
Mutability
Arrays
Dictionaries
Set
Tuples
Summary
4
Control Flow and Functions
Control Flow and Functions
What we have learned so far
Control flow
Functions
Putting it all together
Summary
5
Classes and Structures
Classes and Structures
What are classes and structures?
Creating a class or structure
Custom initializers
Inheritance
Overriding methods and properties
Protocols
Protocol syntax
Extensions
Memory management
Summary
6
Using Protocols and Protocol Extensions
Using Protocols and Protocol Extensions
Protocols as types
Polymorphism with protocols
Type casting with protocols
Protocol extensions
Summary
7
Protocol-Oriented Design
Protocol-Oriented Design
Requirements
Object-Oriented design
Summary
8
Writing Safer Code with Availability and Error Handling
Writing Safer Code with Availability and Error Handling
Error handling prior to Swift 2.0
Native error handling
The availability attribute
Summary
9
Custom Subscripting
Custom Subscripting
Introducing subscripts
Subscripts with Swift arrays
Read and write custom subscripts
Read-only custom subscripts
Calculated subscripts
Subscript values
External names for subscripts
Multidimensional subscripts
When not to use a custom subscript
Summary
10
Using Optional Types
Using Optional Types
Introducing optionals
The need for optional types in Swift
Optional chaining
Summary
11
Working with Generics
Working with Generics
An introduction to generics
Generic functions
Generic types
Associated types
When not to use generics
Summary
12
Working with Closures
Working with Closures
An introduction to closures
Simple closures
Shorthand syntax for closures
Using closures with Swift's array algorithms
Standalone closures and good style guidelines
Changing functionality
Selecting a closure based on results
Creating strong reference cycles with closures
Summary
13
Using Mix and Match
Using Mix and Match
What is mix and match?
When to use mix and match
Using Swift and Objective-C together in the same project
Summary
14
Concurrency and Parallelism in Swift
Concurrency and Parallelism in Swift
Concurrency and parallelism
Summary
15
Swift Formatting and Style Guide
Swift Formatting and Style Guide
What is a programming style guide?
Your style guide
Summary
16
Swifts Core Libraries
Swifts Core Libraries
Apple's URL loading system
Formatter
Summary
17
Adopting Design Patterns in Swift
Adopting Design Patterns in Swift
What are design patterns?
Creational patterns
Structural design patterns
Behavioral design patterns
Summary

Apple's URL loading system

Apple's URL loading system is a framework of classes available to interact with URLs. We can use these classes to communicate with services that use standard Internet protocols. The classes that we will be using in this section to connect to and retrieve information from REST services are as follows:

  • URLSession: This is the main session object.

  • URLSessionConfiguration: This is used to configure the behavior of the URLSession object.

  • URLSessionTask: This is a base class to handle the data being retrieved from the URL. Apple provides three concrete subclasses of the URLSessionTask class.

  • URL: This is an object that represents the URL to connect to.

  • URLRequest: This class contains information about the request that we are making and is used by the URLSessionTask service to make the request.

  • HTTPURLResponse: This class contains the response to our request.

Now, let's look at each of these classes a little more in depth so that we have a basic understanding of what each...

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