iPhone and iPad Apps for Absolute Beginners (Getting Started)

337 Pages·2010·12.45 MB·English

by  Rory Lewis

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TL Apple’s iPhone and iPad are incredibly popular and desirable devices, and Get started building your very own
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ATE available for Apple’s iTunes App Store. So how do you go about creating your P apipPlhicoanteio annsd f rioPmad s acpraptsch
EL own apps for the App Store? If you’ve ever dreamed of the perfect iPhone or h
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iPad app but never thought you could write your own, then open this book o
and get started! iPhone and iPad Apps for Absolute Beginners will teach you to: n
•
set up your computer for iPhone and iPad application development e
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make small changes to existing apps before creating your own a
custom apps n
• d
give your applications style – making them enjoyable to use and

easy to navigate i
P
•
take advantage of numerous Apple innovations, such as the multi- a
touch screen and accelerometer
d
•
use shortcuts and cheat sheets to create powerful apps the easy way
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With reasonable commitment and computer savvy, anybody – from the absolute p
beginner on up – can create simple applications for the iPhone and iPad, and this
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book will show you how. Dr. Rory Lewis walks you through the steps required
s
to getting your first applications up and running. His style of presentation cuts

through the fog of jargon and misinformation that surrounds iPhone/iPad appli- f
o
cation development, and he provides simple, step-by-step instructions, comple-
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mented by a plentiful array of detailed screenshots and illustrations, practical ex-
A
amples, and accompanying online videos that enable you to follow along.
b
The iPhone is the hottest gadget of this generation, and with the release of
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the iPad, Apple has done it again! This larger and more powerful multi-touch, o
multi-task wonder device advances the innovative design and functionality of
l
the iPhone, putting users more naturally and vividly in the driver seat of their u
own creative processes. This book is the guide to the fundamentals of iPhone t iPhone iPad Apps
and iPad application development in a language anyone can understand, es- e and for
pecially dreamers.
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Absolute Beginners
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COMPANION eBOOK SEE LAST PAGE FOR DETAILS ON $10 eBOOK VERSION ISBN 978-1-4302-2700-7 i Foreword by Ben Easton
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iPhone and iPad Apps
for Absolute Beginners

■ ■ ■
Dr. Rory Lewis

i
iPhone and iPad Apps for Absolute Beginners
Copyright © 2010 by Dr. Rory Lewis
All rights reserved. No part of this work may be reproduced or transmitted in any form or by any
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ISBN-13 (pbk): 978-1-4302-2700-7
ISBN-13 (electronic): 978-1-4302-2701-4
Printed and bound in the United States of America 9 8 7 6 5 4 3 2 1
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The source code for this book is available to readers at www.apress.com.

ii
To Adrian and Eunice Lewis: Love you, Granny, and I miss you so much, Pops.
—Dr. Rory Lewis

iii
Contents at a Glance
■Contents at a Glance.......................................................................................iv
■Contents..........................................................................................................v
■Foreword: About the Author...........................................................................ix
■About the Contributing Authors.....................................................................xii(cid:1)
■About the Technical Reviewer......................................................................xiii
■Acknowledgments.........................................................................................xiv
■Preface...........................................................................................................xv
■Chapter 1: Before We Get Started....................................................................1
■Chapter 2: Blast-Off!......................................................................................17
■Chapter 3: What’s Next?................................................................................53
■Chapter 4: An Introduction to the Code.........................................................71
■Chapter 5: Buttons & Labels with Multiple Graphics.....................................93
■Chapter 6: Switch View with Multiple Graphics..........................................125
■Chapter 7: Dragging, Rotating, and Scaling................................................209
■Chapter 8: Table Views, Navigation, and Arrays.........................................235
■Chapter 9: MapKit........................................................................................261
■Index............................................................................................................313
iv
Contents
■Contents at a Glance.......................................................................................iv(cid:1)
■Contents..........................................................................................................v(cid:1)
■Foreword: About the Author...........................................................................ix
■About the Contributing Authors.....................................................................xii(cid:1)
■About the Technical Reviewer......................................................................xiii(cid:1)
■Acknowledgments.........................................................................................xiv
■Preface...........................................................................................................xv(cid:1)

■Chapter 1: Before We Get Started....................................................................1
Necessities and Accessories..................................................................................................................................1
What I Won’t Teach You..........................................................................................................................................6
Computer Science: A Broad and Diverse Landscape.........................................................................................6
What You Will Learn................................................................................................................................................9
How Does This All Work?......................................................................................................................................10
Our Road Map: Using Xcode and Interface Builder..........................................................................................12
■Chapter 2: Blast-Off!......................................................................................17
helloWorld_002 – a Navigation-based Application...............................................................................................38
helloWorld_003 – Modifying a Navigation-based App..........................................................................................48
■Chapter 3: What’s Next?................................................................................53
§I: THE ROAD AHEAD.............................................................................................................................................54
Introducing Chapter 4—An Introduction to the Code......................................................................................54
Introducing Chapter 5—Buttons & Labels with Multiple Graphics..................................................................55
Introducing Chapter 6—Switch View with Multiple Graphics..........................................................................56
Introducing Chapter 7—Dragging, Rotating, and Scaling...............................................................................58
Introducing Chapter 8—Table Views, Navigation, and Arrays.........................................................................59
Introducing Chapter 9—MapKit.......................................................................................................................60
§II: THE iPHONE AND THE iPAD.............................................................................................................................60
§III: A LOOK UNDER THE HOOD..............................................................................................................................66
You’ve Said “Hello!” … but now, INDIO!.........................................................................................................67(cid:1)
v
■ CONTENTS
■Chapter 4: An Introduction to the Code.........................................................71
004_helloWorld: Buttons with Graphics................................................................................................................72
Digging the Code...................................................................................................................................................89
Nibs, Zibs, and Xibs.........................................................................................................................................89
Methods...........................................................................................................................................................90
■Chapter 5: Buttons & Labels with Multiple Graphics.....................................93
helloWorld_005: a View-Based Application..........................................................................................................93
Preliminaries....................................................................................................................................................94
Xcode – Beginning a New Project....................................................................................................................97
Understanding IBOutlets..................................................................................................................................99
Pointers..........................................................................................................................................................101
Properties: Management & Control................................................................................................................103
Adding IBActions............................................................................................................................................105
Coding the Implementation File.....................................................................................................................106
Providing for Synthesis..................................................................................................................................108
Interface Builder: Making the Connections....................................................................................................110
Final Step: File’s Owner & uiImageView........................................................................................................118
Digging the Code.................................................................................................................................................122
IBOutlets and IBActions.................................................................................................................................122
More About Pointers......................................................................................................................................123
In the Chapter Ahead..........................................................................................................................................124
■Chapter 6: Switch View with Multiple Graphics..........................................125
einSwitch_001—a Window-Based Application..................................................................................................128
Preliminaries..................................................................................................................................................128
Name your Project “einSwitch01”.................................................................................................................133
Create the 1st UIViewController Subclass.....................................................................................................137
Create the Ein1Controller...............................................................................................................................138
Check Header and Implementation Files.......................................................................................................139
Create the Ein2Controller...............................................................................................................................139
Make Sure Images Are Embedded.................................................................................................................140
Save Einstein2View.xib..................................................................................................................................141
Drag the Images into Xcode...........................................................................................................................142
Assign your Icon in the “plist”.......................................................................................................................143
Code the AppViewDelegate............................................................................................................................144
Working SwitchView......................................................................................................................................146
SwitchViewController and AppDelegate........................................................................................................148
SwitchViewController Header File.................................................................................................................152
Ready for Lazy Load—Implementation File...................................................................................................155
A Note about Comments and Lazy Loads......................................................................................................156
Copy Contents of SwitchViewController.txt...................................................................................................158
A Note about Apple’s Boilerplate Implementation File...................................................................................159
Working on the .xib Files...............................................................................................................................161
Select the File’s Owner..................................................................................................................................163
vi
■ CONTENTS
Drag a View onto the Screen.........................................................................................................................163
Start Working on the Einstein#View.xib Files................................................................................................167
Repeat Process for Second Image.................................................................................................................171
einSwitch_002—a Tab-Bar Application.............................................................................................................176
einSwitch_003—a Window-Based Application..................................................................................................191
Digging … Your Brain.........................................................................................................................................207
■Chapter 7: Dragging, Rotating, and Scaling................................................209
DragRotateAndScale—a View-Based Application..............................................................................................210
Preliminaries..................................................................................................................................................211
Starting the DragRotateAndScale App...........................................................................................................211
Creating a Custom UIImageView Subclass....................................................................................................213
Overriding – initWithImage in TransformView.m...........................................................................................215
Creating Touch-Handling Stubs.....................................................................................................................216
Translating in touchesMoved.........................................................................................................................218
Making Use of TransformView.......................................................................................................................220
Creating a TransformView.............................................................................................................................220
Preparing TransformView for Rotation and Scaling.......................................................................................225
Helper Methods..............................................................................................................................................226
Adding to “-touchesBegan”...........................................................................................................................227
Modifying -touchesMoved.............................................................................................................................229
Digging the Code.................................................................................................................................................232
■Chapter 8: Table Views, Navigation, and Arrays.........................................235
How Shall We Proceed?......................................................................................................................................238
Table Views and Navigation Stacks....................................................................................................................238
Food: Following the App Store Model.................................................................................................................239
Starting the Food App....................................................................................................................................239
Adding the Category Names Array in RootViewController.h..........................................................................241
Creating the Categories Array in -viewDidLoad............................................................................................242
Setting Up Table View Data Source Methods................................................................................................243
Table View Delegation...................................................................................................................................244
Setting up FoodTableViewController..............................................................................................................245
Creating the Convenience Constructor for the FoodTableViewController......................................................248
Data Source and Delegation for the FoodTableViewController......................................................................249
Creating the FoodViewController Class..........................................................................................................250
The FoodViewController Header File..............................................................................................................251
The FoodViewController Convenience Constructor........................................................................................252
Setting Up FoodViewController, -viewDidLoad, and the (.xib).......................................................................252
Icon File.........................................................................................................................................................254
Testing the App..............................................................................................................................................255
Digging the Code.................................................................................................................................................257
Memory Management....................................................................................................................................257
Reuse Identifiers............................................................................................................................................259
■Chapter 9: MapKit........................................................................................261
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