Book Image

Mastering Swift 2

By : Jon Hoffman
Book Image

Mastering Swift 2

By: Jon Hoffman

Overview of this book

<p><span id="description" class="sugar_field">At their Worldwide Developer’s conference (WWDC) in 2015, Apple announced Swift 2, a major update to the innovative programming language they first unveiled to the world the year before. Swift 2 features exciting enhancements to the original iteration of Swift, acting, as Apple put it themselves as “a successor to the C and Objective-C languages.” – This book demonstrates how to get the most from these new features, and gives you the skills and knowledge you need to develop dynamic iOS and OS X applications.<br /> </span></p> <p><span id="description" class="sugar_field">Learn how to harness the newest features of Swift 2 todevelop advanced applications on a wide range of platforms with this cutting-edge development guide. Exploring and demonstrating how to tackle advanced topics such as Objective-C interoperability, ARC, closures, and concurrency, you’ll develop your Swift expertise and become even more fluent in this vital and innovative language. With examples that demonstrate how to put the concepts into practice, and design patterns and best practices, you’ll be writing better iOS and OSX applications in with a new level of sophistication and control.</span></p>

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Table of Contents (24 chapters)
Mastering Swift 2
Mastering Swift 2
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 Collections and Cocoa Data Types
Using Collections and Cocoa Data Types
Swift collection types
Mutability
Arrays
Dictionaries
Set
Tuples
Using Cocoa data types
Foundation data types
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
Writing Safer Code with Availability and Error Handling
Writing Safer Code with Availability and Error Handling
Error handling prior to Swift 2.0
Error handling in Swift 2
The availability attribute
Summary
8
Working with XML and JSON Data
Working with XML and JSON Data
XML and JSON
Common files
XML and the NSXMLParser class
Using the NSXMLParserDelegate protocol
Parsing XML documents
XML and manually building XML documents
JSON and NSJSONSerialization
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
Subscripts with ranges
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
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
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
Network Development with Swift
Network Development with Swift
What is network development?
An overview of the URL session classes
REST web services
Making an HTTP GET request
Making an HTTP POST request
Checking network connection
RSNetworking2 for Swift 2
Summary
17
Adopting Design Patterns in Swift
Adopting Design Patterns in Swift
Value versus reference types
What are design patterns
Creational patterns
Structural design patterns
Behavioral design patterns
Summary
Index
Index

Summary

In this chapter, we saw that it takes a lot less code to parse/build JSON objects with the NSJSONSerialization class as compared to parsing/building XML objects. However, we do have a lot more control on how the document is parsed using the NSXMLParser class. The key thing to keep in mind with both the NSJSONSerialization class and the NSXMLParser class is that we need to remember to check that optional variables do not contain a nil value, before attempting to use them.

While it seems that the majority of newer services are using the JSON format over XML, it is good to have a working knowledge of both formats because there is still a large percentage of services that use XML.

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