iOS 8 Application Development in 24 Hours, Sams Teach Yourself, 6th Edition

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iOS 8 Application Development in 24 Hours, Sams Teach Yourself, 6th Edition

By John Ray
Published Mar 6, 2015 by Sams. Part of the Sams Teach Yourself series.

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Description

Copyright 2015
Dimensions: 7" x 9-1/8"
Edition: 6th

EPUB (Watermarked)
ISBN-10: 0-13-399442-2
ISBN-13: 978-0-13-399442-1

In just 24 sessions of one hour each, learn how to build powerful applications for today’s hottest handheld devices: the iPhone and iPad! Using this book’s straightforward, step-by-step approach, you’ll master every skill and technology you need, from setting up your iOS development environment to building great user interfaces, sensing motion to writing multitasking applications. Each lesson builds on what you’ve already learned, giving you a rock-solid foundation for real-world success!

Step-by-step instructions carefully walk you through the most common iOS development tasks.
Quizzes and Exercises help you test your knowledge.
By the Way notes present interesting information related to the discussion.
Did You Know? tips show you easier ways to perform tasks.
Watch Out! cautions alert you to possible problems and give you advice on how to avoid them.

John Ray is currently serving as the Director of the Office of Research Information Systems at the Ohio State University. His many books include Using TCP/IP: Special Edition, Maximum Mac OS X Security, Mac OS X Unleashed, Teach Yourself Dreamweaver MX in 21 Days, and Sams Teach Yourself iOS 7 Application Development in 24 Hours.

Printed in full color–figures and code appear as they do in Xcode

Covers iOS 8 and up
Learn to navigate the Xcode 6.x development environment
Prepare your system and iDevice for efficient development
Get started quickly with Apple’s new language: Swift
Test code using the new iOS Playground
Understand the Model-View-Controller (MVC) development pattern
Visually design and code interfaces using Xcode Storyboards, Segues, Exits, Image Slicing, and the iOS Object Library
Use Auto Layout and Size Classes to adapt to different screen sizes and orientations
Build advanced UIs with Tables, Split Views, Navigation Controllers, and more
Read and write preferences and data, and create System Settings plug-ins
Use the iOS media playback and recording capabilities
Take photos and manipulate graphics with Core Image
Sense motion, orientation, and location with the accelerometer, gyroscope, and GPS
Integrate online services using Twitter, Facebook, Email, Web Views, and Apple Maps
Create universal applications that run on both the iPhone and iPad
Write background-aware multitasking applications
Trace, debug, and monitor your applications as they run



Sample Content

Introduction 1

HOUR 1: Preparing Your System and iDevice for Development 5

Welcome to the iOS Platform . . . . . . . 5

Becoming an iOS Developer . . . . . . . . . . . . . . . . . . . . . . . . . 9

Running an iOS App . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Developer Technology Overview . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . 23

Further Exploration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Q&A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Workshop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

HOUR 2: Introduction to Xcode and the iOS Simulator 29

Using Xcode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Using the iOS Simulator . . . . . . . . . . . . . . . . . . . . . . . . 63

Further Exploration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Summary . . . . . . . . . . . . . . . . . . . . . . . . . 71

Q&A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Workshop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

HOUR 3: Discovering Swift and the iOS Playground 77

Object-Oriented Programming and Swift . . . . . . . . . . . . . . . .. . . . . . . . . . . 77

The Terminology of Object-Oriented Development . . . . . . . . . . . . . . . .. . . . . . . . . 79

Exploring the Swift File Structure . . . . . . . . . . . . . . . . . . . . . . . . . 82

Swift Programming Basics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Memory Management and Automatic Reference Counting . . . . . . . . . . . . . . . 107

Introducing the iOS Playground . . . . . . . . . . . . . . . . . . . . . . . . 108

Further Exploration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

Q&A . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Workshop . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Activities . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

HOUR 4: Inside Cocoa Touch 117

What Is Cocoa Touch? . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Exploring the iOS Technology Layers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Tracing the iOS Application Life Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Cocoa Fundamentals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

Exploring the iOS Frameworks with Xcode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135

Further Exploration . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . 143

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

Q&A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 143

Workshop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 144

Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

HOUR 5: Exploring Interface Builder 147

Understanding Interface Builder . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147

Creating User Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154

Customizing the Interface Appearance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

Connecting to Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170

Further Exploration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180

Q&A . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

Workshop . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184

HOUR 6: Model-View-Controller Application Design 185

Understanding the MVC Design Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

How Xcode Implements MVC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Using the Single View Application Template . . . . . . . . . . . . . . . . . . . . . . . 191

Further Exploration . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . 209

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . 210

Q&A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210

Workshop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210

Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213

HOUR 7: Working with Text, Keyboards, and Buttons 215

Basic User Input and Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215

Using Text Fields, Text Views, and Buttons . . . . . . . . . . . . . . . . . . . . . . . . . 217

Further Exploration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246

Q&A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247

Workshop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247

Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249

HOUR 8: Handling Images, Animation, Sliders, and Steppers 251

User Input and Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251

Creating and Managing Image Animations, Sliders, and Steppers . . . . . . . . . . . . . 253

Further Exploration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275

Summary . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . 276

Q&A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276

Workshop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277

Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279

HOUR 9: Using Advanced Interface Objects and Views 281

User Input and Output (Continued) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281

Using Switches, Segmented Controls, and Web Views . . . . . . . . . . . . . . .. . . . . 287

Using Scrolling Views . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303

Further Exploration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 312

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313

Q&A . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313

Workshop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313

Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 316

HOUR 10: Getting the User’s Attention 317

Alerting the User . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . 317

Exploring User Alert Methods . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . 328

Further Exploration . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . 343

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344

Q&A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 344

Workshop . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . 344

Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 347

HOUR 11: Implementing Multiple Scenes and Popovers 349

Introducing Multiscene Storyboards . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . 350

Using Segues . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . 377

Popovers, Universal Applications, and iPhones . . . . . . . . . . . . . . . .. . . . . . . . 390

Further Exploration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 395

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 396

Q&A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 396

Workshop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 396

Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 399

HOUR 12: Making Choices with Toolbars and Pickers 401

Understanding the Role of Toolbars . . . . . . . . . . . . . . . . . . . . . . . . . . 401

Exploring Pickers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 404

Using the Date Picker . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 412

Using a Custom Picker . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 425

Further Exploration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 440

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 441

Q&A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 441

Workshop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 442

Activities . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 444

HOUR 13: Advanced Storyboards Using Navigation and Tab Bar Controllers 445

Advanced View Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 445

Exploring Navigation Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 447

Understanding Tab Bar Controllers . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . 452

Using a Navigation Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 458

Using a Tab Bar Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 469

Further Exploration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 479

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 480

Q&A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 480

Workshop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . 481

Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . 483

HOUR 14: Navigating Information Using Table Views and Split View Controllers 485

Understanding Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 486

Exploring the Split View Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 495

A Simple Table View Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 498

Creating a Master-Detail Application . . . . . . . . . . . . . . . . . . . . . . . . . . 507

Further Exploration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 521

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 522

Q&A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . 523

Workshop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 523

Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 525

HOUR 15: Reading and Writing Application Data 527

iOS Applications and Data Storage . . . . . . . . . . . . . . . . . . . . . . . . 527

Data Storage Approaches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 530

Creating Implicit Preferences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 539

Implementing System Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 546

Implementing File System Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 559

Further Exploration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 567

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 568

Q&A . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 568

Workshop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 569

Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 571

HOUR 16: Building Responsive User Interfaces 573

Responsive Interfaces . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . 573

Using Auto Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 578

Programmatically Defined Interfaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600

Further Exploration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 607

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 607

Q&A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 608

Workshop . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 608

Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 610

HOUR 17: Using Advanced Touches and Gestures 611

Multitouch Gesture Recognition . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . 611

Adding Gesture Recognizers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 612

Using Gesture Recognizers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 614

Further Exploration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 635

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 635

Q&A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 636

Workshop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 636

Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 638

HOUR 18: Sensing Orientation and Motion 639

Understanding Motion Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 639

Accessing Orientation and Motion Data . . . . . . . . . . . . . . . . . . . . . . . . . . 643

Sensing Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 647

Detecting Acceleration, Tilt, and Rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 652

Further Exploration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 663

Summary . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 664

Q&A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 664

Workshop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 664

Activities . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 666

HOUR 19: Working with Rich Media 669

Exploring Rich Media . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 669

The Media Playground Application . . . . . . . . . .. . . . . . . . . . . . . . . 683

Further Exploration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 708

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 709

Q&A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 709

Workshop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 710

Activities . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 712

HOUR 20: Interacting with Other iOS Services 713

Extending iOS Service Integration . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . 713

Using the Address Book, Email, Social Networking, and Maps . . . . . . . . . . . . . . . . . . . . 730

Further Exploration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 746

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 746

Q&A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 746

Workshop . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 747

Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 749

HOUR 21: Implementing Location Services 751

Understanding Core Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 751

Creating a Location-Aware Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . 758

Further Exploration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 777

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 778

Q&A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 778

Workshop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 778

Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 781

HOUR 22: Building Background-Ready Applications 783

Understanding iOS Backgrounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 783

Disabling Backgrounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 789

Handling Background Suspension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 790

Implementing Local Notifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 792

Using Task-Specific Background Processing. . . . . . . . . . . . . . . . . . . . . 795

Completing a Long-Running Background Task . . . . . . . . . . . . . . . . . . . . . . . 800

Performing a Background Fetch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 806

Further Exploration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 810

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 811

Q&A . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 811

Workshop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 812

Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 814

HOUR 23: Building Universal Applications 815

Universal Application Development . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 815

Size Classes . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . 819

Further Exploration . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . 833

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . 834

Q&A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 834

Workshop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 834

Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . 836

HOUR 24: Application Tracing, Monitoring, and Debugging 837

Instant Feedback with NSLog . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 838

Using the Xcode Debugger . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . 841

Further Exploration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 858

Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 859

Q&A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 859

Workshop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 859

Activities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 862

Index 863

ONLINE APPENDIX A: Introducing Xcode Source Control

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Privacy Notice

Overview

Pearson Education, Inc., 221 River Street, Hoboken, New Jersey 07030, (Pearson) presents this site to provide information about products and services that can be purchased through this site.

This privacy notice provides an overview of our commitment to privacy and describes how we collect, protect, use and share personal information collected through this site. Please note that other Pearson websites and online products and services have their own separate privacy policies.

Collection and Use of Information

To conduct business and deliver products and services, Pearson collects and uses personal information in several ways in connection with this site, including:

Questions and Inquiries

For inquiries and questions, we collect the inquiry or question, together with name, contact details (email address, phone number and mailing address) and any other additional information voluntarily submitted to us through a Contact Us form or an email. We use this information to address the inquiry and respond to the question.

Online Store

For orders and purchases placed through our online store on this site, we collect order details, name, institution name and address (if applicable), email address, phone number, shipping and billing addresses, credit/debit card information, shipping options and any instructions. We use this information to complete transactions, fulfill orders, communicate with individuals placing orders or visiting the online store, and for related purposes.

Surveys

Pearson may offer opportunities to provide feedback or participate in surveys, including surveys evaluating Pearson products, services or sites. Participation is voluntary. Pearson collects information requested in the survey questions and uses the information to evaluate, support, maintain and improve products, services or sites, develop new products and services, conduct educational research and for other purposes specified in the survey.

Contests and Drawings

Occasionally, we may sponsor a contest or drawing. Participation is optional. Pearson collects name, contact information and other information specified on the entry form for the contest or drawing to conduct the contest or drawing. Pearson may collect additional personal information from the winners of a contest or drawing in order to award the prize and for tax reporting purposes, as required by law.

Newsletters

If you have elected to receive email newsletters or promotional mailings and special offers but want to unsubscribe, simply email information@informit.com.

Service Announcements

On rare occasions it is necessary to send out a strictly service related announcement. For instance, if our service is temporarily suspended for maintenance we might send users an email. Generally, users may not opt-out of these communications, though they can deactivate their account information. However, these communications are not promotional in nature.

Customer Service

We communicate with users on a regular basis to provide requested services and in regard to issues relating to their account we reply via email or phone in accordance with the users' wishes when a user submits their information through our Contact Us form.

Other Collection and Use of Information

Application and System Logs

Pearson automatically collects log data to help ensure the delivery, availability and security of this site. Log data may include technical information about how a user or visitor connected to this site, such as browser type, type of computer/device, operating system, internet service provider and IP address. We use this information for support purposes and to monitor the health of the site, identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents and appropriately scale computing resources.

Web Analytics

Pearson may use third party web trend analytical services, including Google Analytics, to collect visitor information, such as IP addresses, browser types, referring pages, pages visited and time spent on a particular site. While these analytical services collect and report information on an anonymous basis, they may use cookies to gather web trend information. The information gathered may enable Pearson (but not the third party web trend services) to link information with application and system log data. Pearson uses this information for system administration and to identify problems, improve service, detect unauthorized access and fraudulent activity, prevent and respond to security incidents, appropriately scale computing resources and otherwise support and deliver this site and its services.

Cookies and Related Technologies

This site uses cookies and similar technologies to personalize content, measure traffic patterns, control security, track use and access of information on this site, and provide interest-based messages and advertising. Users can manage and block the use of cookies through their browser. Disabling or blocking certain cookies may limit the functionality of this site.

Do Not Track

This site currently does not respond to Do Not Track signals.

Security

Pearson uses appropriate physical, administrative and technical security measures to protect personal information from unauthorized access, use and disclosure.

Children

This site is not directed to children under the age of 13.

Marketing

Pearson may send or direct marketing communications to users, provided that

Pearson will not use personal information collected or processed as a K-12 school service provider for the purpose of directed or targeted advertising.
Such marketing is consistent with applicable law and Pearson's legal obligations.
Pearson will not knowingly direct or send marketing communications to an individual who has expressed a preference not to receive marketing.
Where required by applicable law, express or implied consent to marketing exists and has not been withdrawn.

Pearson may provide personal information to a third party service provider on a restricted basis to provide marketing solely on behalf of Pearson or an affiliate or customer for whom Pearson is a service provider. Marketing preferences may be changed at any time.

Correcting/Updating Personal Information

If a user's personally identifiable information changes (such as your postal address or email address), we provide a way to correct or update that user's personal data provided to us. This can be done on the Account page. If a user no longer desires our service and desires to delete his or her account, please contact us at customer-service@informit.com and we will process the deletion of a user's account.

Choice/Opt-out

Users can always make an informed choice as to whether they should proceed with certain services offered by InformIT. If you choose to remove yourself from our mailing list(s) simply visit the following page and uncheck any communication you no longer want to receive: www.informit.com/u.aspx.

Sale of Personal Information

Pearson does not rent or sell personal information in exchange for any payment of money.

While Pearson does not sell personal information, as defined in Nevada law, Nevada residents may email a request for no sale of their personal information to NevadaDesignatedRequest@pearson.com.

Supplemental Privacy Statement for California Residents

California residents should read our Supplemental privacy statement for California residents in conjunction with this Privacy Notice. The Supplemental privacy statement for California residents explains Pearson's commitment to comply with California law and applies to personal information of California residents collected in connection with this site and the Services.

Sharing and Disclosure

Pearson may disclose personal information, as follows:

As required by law.
With the consent of the individual (or their parent, if the individual is a minor)
In response to a subpoena, court order or legal process, to the extent permitted or required by law
To protect the security and safety of individuals, data, assets and systems, consistent with applicable law
In connection the sale, joint venture or other transfer of some or all of its company or assets, subject to the provisions of this Privacy Notice
To investigate or address actual or suspected fraud or other illegal activities
To exercise its legal rights, including enforcement of the Terms of Use for this site or another contract
To affiliated Pearson companies and other companies and organizations who perform work for Pearson and are obligated to protect the privacy of personal information consistent with this Privacy Notice
To a school, organization, company or government agency, where Pearson collects or processes the personal information in a school setting or on behalf of such organization, company or government agency.

Links

This web site contains links to other sites. Please be aware that we are not responsible for the privacy practices of such other sites. We encourage our users to be aware when they leave our site and to read the privacy statements of each and every web site that collects Personal Information. This privacy statement applies solely to information collected by this web site.

Requests and Contact

Please contact us about this Privacy Notice or if you have any requests or questions relating to the privacy of your personal information.

Changes to this Privacy Notice

We may revise this Privacy Notice through an updated posting. We will identify the effective date of the revision in the posting. Often, updates are made to provide greater clarity or to comply with changes in regulatory requirements. If the updates involve material changes to the collection, protection, use or disclosure of Personal Information, Pearson will provide notice of the change through a conspicuous notice on this site or other appropriate way. Continued use of the site after the effective date of a posted revision evidences acceptance. Please contact us if you have questions or concerns about the Privacy Notice or any objection to any revisions.

Last Update: November 17, 2020

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