Mastering Swift 4: An in-depth and comprehensive guide to modern programming techniques with Swift

381 Pages·2017·9.75 MB·English

by  Jon Hoffman

Mastering Swift 4
Fourth Edition
An in-depth and comprehensive guide on modern
programming techniques with Swift
Jon Hoffman
BIRMINGHAM - MUMBAI
Mastering Swift 4
Fourth Edition
Copyright © 2017 Packt Publishing
All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or
transmitted in any form or by any means, without the prior written permission of the
publisher, except in the case of brief quotations embedded in critical articles or reviews.
Every effort has been made in the preparation of this book to ensure the accuracy of the
information presented. However, the information contained in this book is sold without
warranty, either express or implied. Neither the author, nor Packt Publishing, and its
dealers and distributors will be held liable for any damages caused or alleged to be caused
directly or indirectly by this book.
Packt Publishing has endeavored to provide trademark information about all of the
companies and products mentioned in this book by the appropriate use of capitals.
However, Packt Publishing cannot guarantee the accuracy of this information.
First published: June 2015
Second edition: November 2015
Third edition: October 2016
Fourth edition: September 2017
Production reference: 1250917
Published by Packt Publishing Ltd.
Livery Place
35 Livery Street
Birmingham
B3 2PB, UK.
ISBN 978-1-78847-780-2
www.packtpub.com
Credits
Author Copy Editor
Jon Hoffman Safis Editing
Reviewer Project Coordinator
Arthur Ariel Sabintsev Ulhas Kambali
Commissioning Editor Proofreader
Ashwin Nair Safis Editing
Acquisition Editor Indexer
Reshma Raman Rekha Nair
Content Development Editor Graphics
Vikas Tiwari Abhinash Sahu
Technical Editor Production Coordinator
Subhalaxmi Nadar Melwyn D'sa
About the Author
Jon Hoffman has over 25 years of experience in the field of information technology. Over
these years, Jon has worked in the areas of system administration, network administration,
network security, application development, and architecture. Currently, Jon works as a
senior software engineer for Syn-Tech Systems.
Jon has developed extensively for the iOS platform since 2008. This includes several apps
that he has published in the App Store, apps that he has written for third parties, and
numerous enterprise applications. He has also developed mobile applications for the
Android and Windows platforms. What really drives Jon is the challenges that the field of
information technology provides, and there is nothing more exhilarating to him than
overcoming a challenge.
Some of Jon's other interests are spending time with his family, robotic projects, and 3D
printing. Jon also really enjoys Tae Kwon Do, where he and his oldest daughter, Kailey,
earned their black belts together early in 2014, Kim (his wife), earned her black belt in
December 2014, and his youngest daughter, Kara, is currently working toward her black
belt.
About the Reviewer
Arthur Ariel Sabintsev is one of the lead iOS engineers at The Washington Post. His mobile
engineering career includes working for a U.S. government-funded digital identity startup
(ID.me), a Techstars-funded video startup (Shelby.tv), and an award winning mobile
development agency (Fueled). He's spent the last 4 years teaching Swift and Objective-C for
General Assembly and Betamore. He also maintains over a dozen open source iOS libraries
and has made contributions to the Swift language and to the Swift Source Compatibility
Suite. Before leaving his PhD program, he was an experimental nuclear physicist who
worked underground colliding subatomic and subnuclear particles.
www.PacktPub.com
For support files and downloads related to your book, please visit www.PacktPub.com.
Did you know that Packt offers eBook versions of every book published, with PDF and
ePub files available? You can upgrade to the eBook version at www.PacktPub.com and as a
print book customer, you are entitled to a discount on the eBook copy. Get in touch with us
at [email protected] for more details.
At www.PacktPub.com, you can also read a collection of free technical articles, sign up for a
range of free newsletters and receive exclusive discounts and offers on Packt books and
eBooks.
https://www.packtpub.com/mapt
Get the most in-demand software skills with Mapt. Mapt gives you full access to all Packt
books and video courses, as well as industry-leading tools to help you plan your personal
development and advance your career.
Why subscribe?
Fully searchable across every book published by Packt
Copy and paste, print, and bookmark content
On demand and accessible via a web browser
Customer Feedback
Thanks for purchasing this Packt book. At Packt, quality is at the heart of our editorial
process. To help us improve, please leave us an honest review on this book's Amazon page
at https:/​/​www.​amazon.​com/​dp/​1788477804.
If you'd like to join our team of regular reviewers, you can email us at
[email protected]. We award our regular reviewers with free eBooks and
videos in exchange for their valuable feedback. Help us be relentless in improving our
products!
Table of Contents
Preface
1
Chapter 1: Taking the First Steps with Swift
6
What is Swift? 6
Swift features 8
Playgrounds 10
Getting started with Playgrounds 10
iOS, tvOS, and macOS Playgrounds 14
Showing images in a Playground 15
Creating and displaying graphs in Playgrounds 20
What Playgrounds are not 21
Swift language syntax 22
Comments 22
Semicolons 25
Parentheses 26
Curly brackets 27
An assignment operator does not return a value 28
Spaces are optional in conditional and assignment statements 29
Hello World 29
Summary 31
Chapter 2: Learning about Variables, Constants, Strings, and Operators
32
Constants and variables 33
Defining constants and variables 34
Type safety 36
Type inference 37
Explicit types 37
Numeric types 38
Integer types 38
Floating-point and Double values 41
The Boolean type 42
The string type 43
Optional variables 47
Optional binding 50
Optional chaining 51
Enumerations 53
Operators 57
The assignment operator 57
Comparison operators 58
Arithmetic operators 58
The remainder operator 59
Compound assignment operators 59
The ternary conditional operator 60
The logical NOT operator 60
The logical AND operator 60
The logical OR operator 61
Summary 61
Chapter 3: Using Swift Collections and the Tuple Type
62
Swift collection types 63
Mutability 63
Arrays 64
Creating and initializing arrays 64
Accessing the array elements 66
Counting the elements of an array 67
Is the array empty? 68
Appending to an array 68
Inserting a value into an array 69
Replacing elements in an array 69
Removing elements from an array 69
Merging two arrays 70
Retrieving a subarray from an array 70
Making bulk changes to an array 71
Algorithms for arrays 72
Sort 72
Sorted 73
Filter 73
Map 74
forEach 75
Iterating over an array 75
Dictionaries 76
Creating and initializing dictionaries 77
Accessing dictionary values 77
Counting the key or values in a dictionary 78
Is the dictionary empty? 78
Updating the value of a key 78
Adding a key-value pair 79
[ ii ]