Xcode 4 cookbook

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Xcode 4 Cookbook

Over 100 recipes to build your own fun and exciting
iOS applications

Steven F. Daniel

BIRMINGHAM - MUMBAI

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Xcode 4 Cookbook
Copyright © 2013 Packt Publishing

All rights reserved. No part of this book may be reproduced, stored in a retrieval system,
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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
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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: May 2013

Production Reference: 1160513

Published by Packt Publishing Ltd.
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ISBN 978-1-84969-334-9
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Cover Image by Evelyn lam ()

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Credits
Author

Technical Editors

Steven F. Daniel

Kaustubh Mayekar
Ankita Meshram

Reviewers
Bob Sander-Cederlof
Dave Hersey
Jean-Yves Mengant
Robert Wohnoutka

Veena Pagare
Akshata Patil
Zafeer Rais
Indexer
Monica Ajmera Mehta

Acquisition Editor
Mary Nadar

Graphics
Ronak Dhruv

Lead Technical Editor
Dayan Hyames

Production Coordinator
Manu Joseph

Project Coordinator
Amey Sawant

Cover Work
Manu Joseph

Proofreader
Amy Guest

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About the Author
Steven F. Daniel is originally from London, England, but lives in Australia.
He is the owner and founder of GENIESOFT STUDIOS (iesoftstudios.
com/), a software development company based in Melbourne, Victoria, that currently
develops games and business applications for the iOS, Android, and Windows platforms.
Steven is an experienced software developer with more than 13 years of experience
developing desktop and web-based applications for a number of companies including,
insurance, banking and finance, oil and gas, and local and state government.
Steven is always interested in emerging technologies, and is a member of the SQL Server
Special Interest Group (SQLSIG) and the Java Community. He has been the co-founder and
Chief Technology Officer (CTO) of SoftMpire Pty Ltd., a company that focused primarily on
developing business applications for the iOS and Android platforms.
He is the author of Xcode 4 iOS Development Beginner's Guide, iOS 5 Essentials, and iPad
Enterprise Application Development Blueprints.
You can check out his blog at or follow him
on twitter at />
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Acknowledgement
No book is the product of just the author—he just happens to be the one with
his name on the cover. A number of people contributed to the success of this
book, and it would take more space if I have to thank each one individually.
A special shout-out goes to Mary Nadar, my acquisition editor, who is the
reason that this book exists. Thank you Mary for believing in me and for
being a wonderful guide throughout this whole process. I would like to thank
Amey Sawant for ensuring that I stayed on track and got my chapters in on
time, and to Dayan Hyames for his brilliant suggestive approach with the
chapter rewrites.

I would also like to extend my thanks to each of my Technical Editors for
their brilliant suggestions and improvements to each chapter, as well as
ensuring that we met our timeframes, and delivery for this book. It has
been a great privilege to work with each of you on this book.
Lastly, to my reviewers, thank you so much for your valued suggestions and
improvements, making this book what it is. I am grateful to each and every
one of you.
Thank you also to the entire Packt Publishing team for working so diligently to
help bring out a high quality product. Finally, a big thank you to the engineers
at Apple for creating the iPhone and the iPad, and providing developers with
the tools to create fun and sophisticated applications. You guys rock.
Finally, I'd like to thank all of my friends for their support, understanding,
and encouragement during the writing process. It is a privilege to know
each and every one of you.

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About the Reviewers
Bob Sander-Cederlof has been programming for over 55 years, including 21 years at

Adobe Systems. During the Apple II era, as owner of S-C Software Corporation, Bob published
the Apple Assembly Line newsletter for over eight years, along with software such as
the S-C Macro Assembler. Other interests include Christianity, the Bible, and genealogy.
More at .

Dave Hersey has over 35 years of experience in Apple software development, dating back

to the Apple II personal computer in 1977. In 2000, after over 6 years in software engineering
at Apple Computer, Dave started Paracoders Inc. focusing on custom Mac OS X-based

application and driver development. In 2008, Dave's company expanded into iOS (iPhone)
mobile applications, followed by Android applications soon after. Some big-named clients
including Paramount Home Entertainment, Lionsgate Entertainment, Seagate, Creative Labs,
Monterey Bay Aquarium, and Kraft Foods. Most recently, Dave's business has expanded to
include additional mobile and server-side platforms as well as support services. As a result,
the custom software development division of Paracoders now operates as "Torchlight Apps"
().
Dave was also a technical reviewer for Creating Games with cocos2d for iPhone 2 and HTML5
Game Development with GameMaker. When he's not learning new technologies, developing
software, or reviewing books, Dave stays busy with his wife raising three children, three dogs,
two parakeets, and about 22 ducks at last count.

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Jean-Yves Mengant is the CTO at SEFAS Innovation, a French software editor. He lives in
France in the Paris area.

Jean-Yves has been in the IT industry for more than 30 years, working on many technologies and
languages from Mainframes MVS to Unixes Mac IOS and Android in Assembly Java, C++, and
Objective-C. He has written articles for Linux Journal, C++ users Journal, and Dr Dobbs journal.
I would like to thank my beloved wife Martine, for supporting my work during
all those years, and and my family Jean-Christophe, Aline, Mathieu, and Julie,
who I love you.

Robert Wohnoutka is an independent software developer with over 20 years of software
development experience. He currently has 11 iPhone apps in the Apple app store.

Robert is a former Apple employee where he learned the importance of ease-of-use which
is the first rule he applies in all the apps that he develops. He also has over 20 years of

Product Marketing experience with high-tech products where the ease-of-use aspect was
his guiding light as he helped companies develop and introduce new technologies into the
hands of consumers.
My Walks is a good example of an app Robert developed where he applied the ease-of-use
principal to a GPS-based walking application. This app only requires the user to tap a Start
button to start the walk and the app will automatically detect the end of the user's walk
should the user forget to tap the End button. My Walks was featured in the Best Mobile Apps
2013 book by Jeremy J. Warner and published by Portrait Health Publishing Inc. Robert has
also developed a version for bicycling named My Bike Rides and a version for skiing named
My Ski Runs.
Robert has developed a number of very easy to use money management apps including
EZ Adder, EZ Adder II, EZ Balances, EZ Balances II, and EZ2Compare2. He also develops
customized apps including an iPhone app for his dentist's clients called Nikki Green DDS.

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This book is dedicated to:
To my favorite uncle Benjamin Jacob Daniel, for always making me smile and for
inspiring me to work hard and achieve my dreams, I miss you a lot.
Chan Ban Guan, for the continued patience, encouragement and support,

and most of all for believing in me during the writing phase of this book.
To my family for always believing in me and for their continued love and support.
To my niece Ava Madison Daniel thank you for continually bringing joy to our family.
To the late Steve Jobs, you will always be an inspiration and a guide towards
perfection. Thank you for all the amazing things you've brought to our lives.
May you rest in peace.
This book would not have been possible without your love and understanding.
I would like to thank you from the bottom of my heart.

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Table of Contents
Preface1
Chapter 1: Getting and Installing the iOS SDK Development Tools
7
Introduction8
Downloading and installing the iOS SDK
9
Using Xcode to create an iOS project
14
Using Interface Builder to create the user interface
19
Building the user interface for our application
22
Creating outlets to Interface Builder objects
24

Creating actions that respond to user actions
28
Compiling your project
30
Using the iOS Simulator to test your applications
32
Configuring and using compiler directives
34
Debugging your iOS applications using Xcode
39
Using the Clang Static Analyzer to examine your code
41

Chapter 2: User Interfaces – Creating the UI

45

Introduction45
Adding and customizing views
46
Using labels to display text
48
Obtaining user input through the use of buttons
51
Displaying an image within the view
53
Displaying and editing text
55
Using the iOS device keyboard
59

Displaying the progress to the user
61
Adding a toolbar to a view
66
Fading a view in and out
68
Creating a custom table view controller
71
Adding a table view to a view controller
72
Handling different iOS devices
74

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Table of Contents

Chapter 3: Using Storyboards

79

Introduction79
Configuring storyboards for a project
80
Creating a Twitter application
82
Creating storyboard scenes
84
Configuring storyboard scenes

87
Applying transitions to storyboards
92
Composing a tweet
94
Adding photos to a tweet
101
Preparing transition to another view controller
106
Presenting storyboard view controllers programmatically
109

Chapter 4: Using Xcode Instruments

113

Chapter 5: Working with the Location Services and the
MapKit Frameworks

141

Chapter 6: Storing Documents within the Cloud

177

Introduction113
Introducing Xcode Instruments
114
Tracing iOS applications
119

Running and profiling an iOS project
120
Detecting virtual memory faults
125
Detecting memory leaks
127
Handling runtime errors
130
Handling compile-time errors
134
Adding and configuring Instruments
136

Introduction141
Adding the CoreLocation and MapKit frameworks
142
Building a simple CoreLocation application
144
Determining the current GPS location
148
Adding and working with the MapView control
153
Adding overlay regions to maps
156
Adding annotation placeholders to the map
159
Reversing geocode address information
167
Working with the different map types
171

Introduction177
Storing and using documents within iCloud
178
Working with the iCloud storage APIs
181
Detecting file version conflicts within iCloud
184
Building the iCloud application
186

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Table of Contents

Requesting entitlements for iCloud storage
Configuring iOS devices to use iCloud

199
204

Chapter 7: Working with Different Multimedia Resources

207

Chapter 8: Working with the CoreData and GameKit Frameworks

245

Chapter 9: Creating a Social Networking App with the
Facebook iOS SDK

285

Introduction207
Selecting images and video from the camera roll
208
Capturing media with the camera
211
Playing video with Apple TV integration
215
Playing music using the MediaPlayer framework
219
Using the iOS device's microphone to record
222
Animating views
226
Drawing customized text
229
Drawing lines and curves
232
Drawing and filling shapes
235
Applying color effects using Core Image
237
Applying transition effects
242
Introduction246

Adding the GameKit and MessageUI frameworks
246
Building the Core Data data model
247
Creating the Core Data model files
249
Adding and configuring the Storyboard
252
Creating the Books Library user interface
254
Displaying data within the Table View
258
Inserting data within our Core Data data model
261
Delete an item from the Table View using Core Data
264
Reordering rows within a Table View
265
Filtering and searching for data within a Table View
268
Working with the different keyboard styles
271
Transferring data to another device using bluetooth
273
Implementing e-mail messaging
280

Introduction285
Downloading the Facebook iOS SDK
286

Registering your iOS applications with Facebook
288
Building a simple social networking application
292
Adding the Facebook SDK and dependencies to your project
295
Implementing the Single Sign On (SSO) feature
298

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Table of Contents

Implementing the View Controller class
Requesting additional Facebook permissions
Using the Graph API to read JSON data
Integrating with the Facebook social channels
Handling Facebook errors within your application

304
308
311
315
318

Chapter 10: Packaging and Deploying Your Application

323

Appendix: Exploring the MultiTouch Interface

355

Introduction324
Setting up your iOS development team
324
Creating the iOS development certificate
329
Obtaining the development certificate from Apple
331
Registering your iOS devices for testing
335
Creating your application App IDs
337
Creating the development provisioning profiles
340
Using the provisioning profile to install the app on an iOS device
343
Preparing an application for submission to the App Store using
iTunes Connect
345
Archiving and submitting apps using Xcode 4
351
Introduction355
Sensing the movement and device orientation
356
Using the shake gesture with the touch interface

358
Detecting device touches with the touch interface
362
Sensing movement with the accelerometer input
365
Working with the iOS device gyroscope
370

Index375

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Preface
The Xcode 4 Cookbook provides you with the skills and knowledge, and practical recipes
on how to go about developing useful applications that can be used within the industry.
By using this cookbook's step-by-step style approach, presenting examples in the style
of recipes, allowing you to go directly to your topic of interest, or follow topics throughout
a chapter to gain in-depth knowledge, you will gain the skills needed to develop some
stunning applications.
This cookbook is a practical guide featuring over 100 recipes that show you how to build
your own fun and exciting iOS applications by integrating iCloud, Facebook, Mobile core
services, Core Image and Media Player Frameworks, and the Core Graphics and Core
Motion frameworks, that will enable you to enhance your applications to create some
amazing image and transition effects using the built-in image filters.
In this book, I have tried my best to keep the code simple and easy to understand. I have
provided step-by-step instructions with loads of screenshots at each step to make it easier
to follow. You will soon be mastering the different aspects of iOS 6 programming, as well

as mastering the technology and skills needed to create some stunning applications.
Feel free to contact me at for any queries, or if you just
want to drop by and say "Hello". Any suggestions for improving this book will be highly regarded.

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Preface

What this book covers
Chapter 1, Getting and Installing the iOS SDK Development Tools, introduces the developer
to the Xcode developer set of tools, as well as the capabilities of the iOS Simulator and each
of the layers contained within the iOS architecture, before finally looking at how to create a
simple Hello World iOS application.
Chapter 2, User Interfaces – Creating the UI, introduces the concept of views and how they
are part of a complete iOS application. Exploring a large number of various view components,
you will create different applications that will help you understand how each component
works. We will also learn about the Model View Controller (MVC) pattern and how to use it
to create applications suitable for enhanced user experience. Through this chapter, you will
also learn about the most useful controllers, which will be part of many of your projects in
the future.
Chapter 3, Using Storyboards, gains an understanding of what Storyboards are and how we
can apply the various transitions between views. We will take a look into how we are able to
create and configure scenes and storyboard files, to present these programmatically. Finally,
we will learn how to integrate Twitter capabilities into our application to tweet photos and
standard messages using the new iOS 6 Social frameworks.
Chapter 4, Using Xcode Instruments, focuses on how to effectively use Instruments within
our applications to track down memory leaks and eliminate bottlenecks that could potentially
cause our application to crash on the user's iOS device. We will also take a look at how to
add and configure instruments, as well as learn how to use the System Trace Instrument to

monitor system calls and track down performance issues within the application.
Chapter 5, Working with the Location Services and the MapKit Frameworks, introduces
a detailed guide for using the built-in location services to create applications that provide
location information to the user. You will not only learn how to use the GPS hardware,
but also how to display maps and layout information using Overlays.
Chapter 6, Storing Documents within the Cloud, introduces you to the benefits of using
iCloud, and how to incorporate iCloud functionality into your applications to store and retrieve
files, and its data through the use of the Storage APIs. This chapter will also give you some
insight into how to go about handling file version conflicts when multiple copies of the same
file are being updated on more than one iOS device.
Chapter 7, Working with the Different Multimedia Resources, focuses on teaching you to
create applications that capture, reproduce, and manage multimedia content through the
device's hardware. You will not only learn to use the camera to capture images and videos
but also how to play back and record audio. We will also learn how to implement the different
image filter effects and transition animations to produce a water ripple effect, as well as
learning how to incorporate Airplay functionality into our application.

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Preface
Chapter 8, Working with the CoreData and GameKit Frameworks, focuses on showing you
how to use the Core Data framework to create a simple Books Library application, to directly
interface with a SQLite database, to create and store book details. We will also look at how to
incorporate Bluetooth functionality, so that you can send book details to another iOS device,
and have this information received wirelessly and stored within the database at the other end.
Chapter 9, Creating a Social Networking App with the Facebook iOS SDK, shows you how to
download the Facebook SDK and register your application with Facebook. It also shows you

how to use the Facebook APIs to integrate Facebook functionality into your app, using the
Single Sign On (SSO) feature. This provides users the ability to sign into your application using
their Facebook identity, so that they can submit notification requests, or submit content to
their wall. We will learn how to use the Open Graph API and Facebook Query Language (FQL)
to pass SQL Query like syntax to retrieve information about the current user, and learn how
to cleanly handle Facebook errors within our iOS applications.
Chapter 10, Packaging and Deploying Your Application, walks you through the required
steps to deploy your finished application to devices, as well as showing you how to prepare
and distribute it to the App Store. We will also take a look at how to create and obtain
provisioning profiles for both development and distribution.
Appendix, Exploring the MultiTouch Interface, discusses how to create applications that
are fully aware of their surrounding environment, through the device's sensors. You will
learn to adjust the user interface according to device orientations and how to respond to
accelerometer and gyroscope events. You will also learn about the built-in shake gesture,
and how to go about responding to the shake motions.

What you need for this book
The minimum requirement for this book is an Intel-based Macintosh computer running Mac
OS X Snow Leopard (10.6.*) or Lion (10.7.*). I would highly recommend upgrading to Lion
or Mountain Lion, as there are many new features in Xcode that are available only to these
two operating systems.
We will be using Xcode 4.6.2, which is the integrated development environment used for
creating applications for iOS development. Almost all projects you will create with the help
of this book will work on the iOS Simulator. However, some projects will require a device
to work correctly. You can download the latest version of Xcode at the following link:
/>
3

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Preface

Who this book is for
If you ever wanted to build applications that interact with Facebook, iCloud, Core Location,
and the Core Motion frameworks into your own applications then this book is for you. You
should have a good knowledge and programming experience with Objective-C and have
used Xcode 4 and iOS 5.

Conventions
In this book, you will find a number of styles of text that distinguish between different kinds of
information. Here are some examples of these styles, and an explanation of their meaning.
Code words in text are shown as follows: "Whenever compiler directives are used in
Objective-C, they are responsible for responding to and executing the associated snippets
of code encapsulated within the #ifdef and #endif tags".
A block of code is set as follows:
- (IBAction)btnTapHere:(id)sender {
NSString *greeting = [NSString stringWithFormat:@"Welcome
To Xcode 4 Cookbook series %@ %@",txtFirstname.text,
txtSurname.text];
lblOutput.text = greeting;
lblOutput.font = [UIFont boldSystemFontOfSize:21];
lblOutput.textColor = [UIColor blueColor];
}

When we wish to draw your attention to a particular part of a code block, the relevant lines
or items are set in bold:
//
//
//

//
//

SecondViewController.h
TwitterExample
Created by Steven F Daniel on 21/09/12.
Copyright (c) 2012 GenieSoft Studios. All rights reserved.

#import <UIKit/UIKit.h>
@interface SecondViewController : UIViewController<UIAlertViewDelegate>
@end

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Preface
New terms and important words are shown in bold. Words that you see on the screen, in
menus or dialog boxes for example, appear in the text like this: " To continue execution of your
application, click on the Continue program execution button".
Warnings or important notes appear in a box like this.

Tips and tricks appear like this.

Reader feedback
Feedback from our readers is always welcome. Let us know what you think about this
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titles that you really get the most out of.
To send us general feedback, simply send an e-mail to , and

mention the book title via the subject of your message.
If there is a topic that you have expertise in and you are interested in either writing or
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Customer support
Now that you are the proud owner of a Packt book, we have a number of things to help you
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Downloading the example code
You can download the example code files for all Packt books you have purchased from your
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visit and register to have the files e-mailed directly
to you.

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Preface

Errata
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If you find a mistake in one of our books—maybe a mistake in the text or the code—we would be
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by visiting selecting your book, clicking on
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be viewed by selecting your title from />
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We appreciate your help in protecting our authors, and our ability to bring you valuable content.

Questions
You can contact us at if you are having a problem with any
aspect of the book, and we will do our best to address it.

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1

Getting and Installing
the iOS SDK
Development Tools
In this chapter, we will cover:
ff

Downloading and installing the iOS SDK

ff

Using Xcode to create an iOS project

ff

Using Interface Builder to create the user interface

ff

Building the user interface for our application

ff

Creating outlets to Interface Builder objects

ff

Creating actions that respond to user actions

ff

Compiling your project

ff

Using the iOS Simulator to test your applications

ff

Configuring and using compiler directives

ff

Debugging your iOS applications using Xcode

ff

Using the Clang Static Analyzer to examine your code

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Getting and Installing the iOS SDK Development Tools

Introduction
Welcome to the exciting world of iOS programming using iOS 6. This latest release of the
mobile operating system is packed with some great new features and improvements, and
comes with over 200 new features as well as an updated SDK featuring over 1,500 new
development APIs that can be incorporated into your applications.
In this chapter, we will look at what integrated development environments (IDEs) and
software development kits (SDKs) are needed to develop applications for the iOS platform,
Apple's operating system for mobile devices. We will explain the importance of each tool's
role in the development cycle, before finally developing our first application. The tools that are
required to develop applications for the iOS platform are explained, as follows:
ff

An Intel-based Mac computer running the Snow Leopard (10.6.*), Lion (10.7.*),
or OS X Mountain Lion (10.8.*) operating system: The essential development tools
cannot be installed on any other computer platforms, so if you are running another
processor type (such as the older Mac G4 or Mac G5), you're out of luck.

ff

iOS 5 SDK (or higher): In order to download the Apple iOS SDK, you must be
registered as an Apple developer. The iOS SDK consists of the following components:

Component

Description

Xcode

This is the main IDE that enables you to develop, edit, and debug
native applications for the iOS and Mac platforms using the
Objective-C programming language.

iOS Simulator

This is a Cocoa-based application that enables you to debug your
iOS applications on the computer, without the need of having an
iOS device. There are many iOS features that simply won't work
within the Simulator, so a device is required if an application uses
those features, that is, the Core Location and MapKit frameworks.

Instruments

These are the analysis tools that help you optimize your
applications and monitor for memory leaks during execution of your
application at real time.

Dashcode

This enables you to develop web-based iOS applications and
dashboard widgets.

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Chapter 1

Downloading and installing the iOS SDK
This recipe includes information on how to sign up to the Apple Developer Program, as well as
how to download and install the necessary tools needed to develop applications using Xcode.

Getting ready
Before you can start building iOS applications, you must first join up as a registered user
of the iOS Developer Program in order to download all of the necessary components to our
computer. At the time of writing, the latest version is 4.5.2, and iOS SDK's latest version is 6.x.
The registration process is free, and provides you access to the iOS SDK and other developer
resources that are really useful for getting you started.
The following short list outlines some of the things that you will be able to access when you
become a member of the iOS Developer Program:
ff

Helpful getting started guides to help you get up and running quickly

ff

Helpful tips that show you how to submit your apps to the App Store

ff

Ability to download current releases of the iOS software

ff

Ability to beta test releases of iOS and the iOS SDK

ff

Access to the Apple Developer Forums
Whether you are developing applications for the iPhone or
iPad, these use the same operating system (OS) and iOS SDK
to allow you to create universal applications that will work with
both the iPhone and iPad running on iOS 4.3.* and above.

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Getting and Installing the iOS SDK Development Tools

How to do it...
To prepare your computer for iOS development, you will need to download and install the
necessary components in the following order:
1. To sign up to the iOS Developer Program, you will need to go to
/>
and then click on the Log in button to proceed, as shown in the following screenshot:

2. Once you have signed up, you will then be able to download the iOS SDK and proceed
with installing it onto your computer.
3. Xcode can also be obtained from the Mac App Store at the following link

depending

on whether you have chosen the version for Mac OSX Lion. The installation procedure
in the remaining steps shows how to go about installing the iOS development tools for
Snow Leopard.
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