Mastering Swift

Jon Hoffman

• Publisher: Packt Publishing
• Year: 2015
• ISBN:
  9781784392154
• Edition: 1
• Topic: Computer Science
• Subtopic: Object Oriented Programming
• Index: Computer Science

Mastering Swift

---

Table of Contents

Mastering Swift

Credits

About the Author

About the Reviewers

www.PacktPub.com

Support files, eBooks, discount offers, and more

Why subscribe?

Free access for Packt account holders

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Downloading the color images of this book

Errata

Piracy

Questions

1. Taking the First Steps with Swift

What is Swift?

Swift features

Playgrounds

Getting started with Playgrounds

iOS and OS X Playgrounds

Showing images in a Playground

Displaying graphs in Playgrounds

What Playgrounds are not

Swift language syntax

Comments

Semicolons

Parentheses

Curly braces

Assignment operator (=) does not return a value

Spaces are optional in conditional and assignment statements

Hello world

Summary

2. Learning about Variables, Constants, Strings, and Operators

Constants and variables

Defining constants and variables

Type safety

Type inference

Explicit types

Numeric types

Integers

Floating-point

The Boolean type

The string type

Optional variables

Enumerations

Operators

The assignment operator

Comparison operators

Arithmetic operators

The remainder operator

Increment and decrement operators

Compound assignment operators

The ternary conditional operator

The logical NOT operator

The logical AND operator

The logical OR operator

Summary

3. Using Collections and Cocoa Data Types

Swift collection types

Mutability

Arrays

Creating and initializing arrays

Accessing the array elements

Counting the elements of an array

Is the array empty?

Appending to an array

Inserting a value into an array

Replacing elements in an array

Removing elements from an array

Adding two arrays

Reversing an array

Retrieving a subarray from an array

Making bulk changes to an array

Algorithms for arrays

sort

sorted

filter

map

Iterating over an array

Dictionaries

Creating and initializing dictionaries

Accessing dictionary values

Counting key/values in a dictionary

Is the dictionary empty?

Updating the value of a key

Adding a key-value pair

Removing a key-value pair

Tuples

Using Cocoa data types

NSNumber

NSString data type

NSArray

NSDictionary

Foundation data types

Summary

4. Control Flow and Functions

What we have learned so far

Curly brackets

Parentheses

Control flow

Conditional statements

The if statement

Executing codes with the if-else statement

The for loops

Using the for loop variant

Using the for-in loop variant

The while loop

Using the while loop

Using the do-while loop

The switch statement

Control transfer statements

The continue statement

The break statement

The fallthrough statement

Functions

Using a single parameter function

Using a multiparameter function

Defining a parameter's default values

Returning multiple values from a function

Returning optional values

Adding external parameter names

Using shorthand for external parameter names

Using variadic parameters

Parameters as variables

Using inout parameters

Nesting functions

Summary

5. Classes and Structures

What are classes and structures?

Similarities between classes and structures

Differences between classes and structures

Value versus reference types

Creating a class or structure

Properties

Stored properties

Computed properties

Property observers

Methods

Initializer

Internal and external parameter names

Failable initializers

Inheritance

Overriding methods and properties

Overriding methods

Overriding properties

Preventing overrides

Protocols

Protocol syntax

Property requirements

Method requirements

Optional requirements

Extensions

Memory management

Reference versus value types

The working of ARC

Strong reference cycles

Summary

6. 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 NSXMLDocument

XML and manually building XML documents

JSON and NSJSONSerialization

Parsing a JSON document

Creating a JSON document

Summary

7. 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

8. Using Optional Type and Optional Chaining

Introducing optionals

The need for optional types in Swift

Defining an optional

Using optionals

Unwrapping an optional

Optional binding

Returning optionals from functions, methods, and subscripts

Using optionals as a parameter in a function or method

Optional types with tuples

Optional chaining

The nil coalescing operator

Summary

9. Working with Generics

Introduction to generics

Generic functions

Generic types

Associated types

Summary

10. Working with Closures

Introducing closures

Simple closures

Shorthand syntax for closures

Using closures with Swift's array algorithms

Standalone closures and good style guidelines

Changing functionality

Select a closure based on results

Strong reference cycles with closures

Summary

11. Using Mix and Match

What is mix and match?

Using Swift and Objective-C together in the same project

Creating the project

Adding the Swift file to the Objective-C project

The Objective-C bridging header file part 1

Adding the Objective-C file to the project

The Messages Objective-C class

The Objective-C bridging header file part 2

The MessageBuilder Swift class – accessing Objective-C code from Swift

The Objective-C class – accessing Swift code from Objective-C

Summary

12. Concurrency and Parallelism in Swift

Concurrency and parallelism

Grand Central Dispatch

Creating and managing dispatch queues

Creating queues with the dispatch_queue_create() function

Creating concurrent dispatch queues with the dispatch_queue_create() function and using the dispatch_asynch() function

Creating a serial dispatch queue with the dispatch_queue_create() function and using the dispatch_sync() function

Requesting concurrent queues with the dispatch_get_global_queue() function

Requesting the main queue with the dispatch_get_main_queue() function

Using the dispatch_after() function

Using the dispatch_once() function

Using NSOperation and NSOperationQueue types

Using the NSBlockOperation implementation of NSOperation

Using the addOperationWithBlock() method of the operation queue

Subclassing the NSOperation class

Summary

13. Swift Formatting and Style Guide

What is a programming style guide?

Your style guide

Do not use semicolons at the end of statements

Do not use parentheses for conditional statements

Naming

Classes

Functions and methods

Constants and variables

Indenting

Comments

Using the self keyword

Types

Constants and variables

Opt...