iOS 8 SDK Development: Creating iPhone and iPad Apps with Swift

288 Pages·2016·14.82 MB·English

by  Adamson C.

Early praise for iOS 8 SDK Development
Not many books cover both programming interfaces and deeper software engineer-
ing topics. It’s refreshing to see both covered, expertly, in one book. Chris and
Janie are masters at making technical content approachable. It’s like having two
of your best friends teaching you iOS.
➤ Mark Dalrymple
Author of Advanced Mac OS X Programming: The Big Nerd Ranch Guide and
co-founder of CocoaHeads, the international Mac and iOS programming com-
munity
iOS 8 SDK Development is a fantastic resource for learning how to make a modern
iOS app. Whether you’re new to iOS in general or just new to Swift, you will leave
the book with a fully functional, modern iOS app with all of the most important
features covered. This book is my new go-to recommendation for those looking to
get started on the platform.
➤ Jeff Kelley
iOS developer at Detroit Labs and author of Learn Cocoa Touch for iOS
This is a really good book. The app you will create while you learn Swift and iOS
development is even quite usable when you are done. Learning Swift is essential
now in the Apple development world, and this book does a great job teaching it.
The authors have put a lot of thought and craft into it, and you will benefit. I
highly recommend it.
➤ Eric Knapp
Program Director, Mobile Applications Development, Madison College
Whether you’re new to iOS programming or just need some help getting up to
speed on iOS 8 and Swift, this is the perfect book for you. Chris and Janie take
you on a well-thought-out and fun journey into iOS SDK development.
➤ Dave Klein
Founder of CocoaConf and author of Grails: A Quick-Start Guide
iOS 8 SDK Development is an excellent book for experienced developers hoping to
develop iOS applications professionally. It is a guided tour of the Swift language,
an extended SDK tutorial using a variety of modern iOS APIs, and a showcase of
effective techniques for organizing and editing projects in the latest version of
Xcode.
➤ Steven Huwig
A new programming language and new APIs. Whether you are a seasoned devel-
oper or a beginner, there’s a lot to learn in the new iOS 8 SDK. Chris and Janie
take your hand and walk you through Swift and the new APIs, providing great
insights and detailed explanations while building a real application.
➤ Cesare Rocchi
Studio Magnolia
iOS 8 SDK Development
Creating iPhone and iPad Apps with Swift
Chris Adamson
Janie Clayton
The Pragmatic Bookshelf
Dallas, Texas • Raleigh, North Carolina
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For international rights, please contact [email protected].
Copyright © 2015 The Pragmatic Programmers, LLC.
All rights reserved.
No part of this publication may be reproduced, stored in a retrieval system, or
transmitted, in any form, or by any means, electronic, mechanical, photocopying,
recording, or otherwise, without the prior consent of the publisher.
Printed in the United States of America.
ISBN-13: 978-1-941222-64-5
Encoded using the finest acid-free high-entropy binary digits.
Book version: P2.0—May 2015
Contents
Acknowledgments . . . . . . . . . . . ix
Introduction . . . . . . . . . . . . xiii
1. Playing Around with Xcode . . . . . . . . . 1
Xcode Playgrounds 1
Digging Into the Docs 6
Wrap-Up 8
2. Building Adaptive User Interfaces . . . . . . . . 9
Our First Project 9
The Xcode Window 11
Building Our User Interface 14
Autolayout 19
Connecting User Interface to Code 23
Coding the App 26
Wrap-Up 30
3. Programming in Swift for iOS . . . . . . . . 31
Introducing Swift 31
Managing an Object’s Properties 36
The iOS Programming Stack 45
Building Views with UIKit 45
Strings 48
Collections 49
Optionals 51
Internationalization 54
Wrap-Up 58
Contents • vi
4. Testing Apps . . . . . . . . . . . . 61
Unit Tests 61
Creating Tests in Xcode 63
Test-Driven Development 66
Creating Tests 67
Testing Asynchronously 71
Testing Frameworks 75
Wrap-Up 77
5. Presenting Data in Table Views . . . . . . . . 79
Tables on iOS 79
Table Classes 80
Creating and Connecting Tables 81
Filling In the Table 85
Customizing Table Appearance 90
Cell Reuse 92
Custom Table Cells 93
Pull-to-Refresh 99
Wrap-Up 101
6. Waiting for Things to Happen with Closures . . . . 103
Setting Up Twitter API Calls 104
Encapsulating Code in Closures 105
Using the Twitter SLAccount 107
Making a Twitter API Request 108
Parsing the Twitter Response 110
Wrap-Up 112
7. Doing Two Things at Once with Closures . . . . . 113
Grand Central Dispatch 114
Concurrency and UIKit 114
Do-It-Yourself Concurrency 120
Wrap-Up 124
8. Growing Our Application . . . . . . . . . 127
Working with Multiple View Controllers 127
Refactoring in Xcode 128
Building Our Own Delegate 131
Making the Twitter Code More General-Purpose 133
Using Another TwitterAPIRequest 136
Wrap-Up 137
Contents • vii
9. Navigating Between View Controllers . . . . . . 139
Navigation Controllers 139
The Navigation Bar 142
Navigating Between View Controllers 144
Using the Storyboard Segue 146
Sharing Data Between View Controllers 147
Modal Navigation 154
Exit Segues 159
Wrap-Up 161
10. Taking Advantage of Large Screens . . . . . . . 163
Split Views on iPad 164
Split Views on the iPhone 170
Size Classes and the iPhone 6 173
Wrap-Up 178
11. Recognizing Gestures . . . . . . . . . . 179
Gesture Recognizers 179
Pinching and Panning 184
Affine Transformations 186
Transforming the Image View 187
Subview Clipping 192
Wrap-Up 194
12. Working with Photos . . . . . . . . . . 195
Photo Assets and PHAsset Class 195
Fetching Our Assets 196
Core Image 201
Wrap-Up 205
13. Launching, Backgrounding, and Extensions . . . . 207
The App Life Cycle 207
Opening via URLs 208
App Extensions 215
Creating a Keyboard Extension 216
Wrap-Up 225
14. Debugging Apps . . . . . . . . . . . 227
println(): The First Line of Defense Against Bugs 227
Breakpoints 229
Setting Up Your Debugging Environment 237
Wrap-Up 239
Contents • viii
15. Publishing to the App Store . . . . . . . . 241
Protecting Our Code with Source Control 241
Running on the Device 246
Icons and Launch Images 252
Submitting Apps for Review 255
After We Ship 260
Onward! 262
Index . . . . . . . . . . . . . . 265