iPhone and iPad Apps for Absolute Beginners

336 Pages·2010·12.43 MB·English

CYAN YELLOW SSSPPPOOOTTT GGGlllooossssss
MAGENTA BLACK
PANTONE 123 C SSSSPPPPOOOOTTTT MMMMaaaatttteeete
BOOKS FOR PROFESSIONALS BY PROFESSIONALS® Companion
eBook
Available
S
E
TL Apple’s iPhone and iPad are incredibly popular and desirable devices, and Get started building your very own
TI Learn how to build Java-based BlackBerry
D part of the reason for their popularity is the wonderful assortment of apps i
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
R
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
•
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
A
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
p
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-
r
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
s
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.
B
e
g
Absolute Beginners
i
n
n
e
r
s

L Dr. Rory Lewis
e
w
COMPANION eBOOK SEE LAST PAGE FOR DETAILS ON $10 eBOOK VERSION ISBN 978-1-4302-2700-7 i Foreword by Ben Easton
s
52999
US $29.99
Shelve in
Mobile Computing
SOURCE CODE ONLINE
User level:
www.apress.com Beginner 9 781430 227007
this print for content only—size & color not accurate Trim: 7.5 x 9.25 spine = 0.75" 336 page count

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
means, electronic or mechanical, including photocopying, recording, or by any information
storage or retrieval system, without the prior written permission of the copyright owner and the
publisher.
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
Trademarked names may appear in this book. Rather than use a trademark symbol with every
occurrence of a trademarked name, we use the names only in an editorial fashion and to the
benefit of the trademark owner, with no intention of infringement of the trademark.
President and Publisher: Paul Manning
Lead Editor: Ben Renow-Clark
Technical Reviewer: Kristian Besley
Editorial Board: Clay Andres, Steve Anglin, Mark Beckner, Ewan Buckingham, Gary Cornell,
Jonathan Gennick, Jonathan Hassell, Michelle Lowman, Matthew Moodie, Duncan
Parkes, Jeffrey Pepper, Frank Pohlmann, Douglas Pundick, Ben Renow-Clarke, Dominic
Shakeshaft, Matt Wade, Tom Welsh
Coordinating Editors: Fran Parnell and Debra Kelly
Copy Editor: Jim Compton
Compositor: MacPS, LLC
Indexer: Potomac Indexing, LLC
Artist: April Milne
Cover Designer: Anna Ishchenko
Distributed to the book trade worldwide by Springer-Verlag New York, Inc., 233 Spring
Street, 6th Floor, New York, NY 10013. Phone 1-800-SPRINGER, fax [phone], e-
mail [email protected], or visit www.springeronline.com.
For information on translations, please e-mail [email protected], or visit www.apress.com.
Apress and friends of ED books may be purchased in bulk for academic, corporate, or
promotional use. eBook versions and licenses are also available for most titles. For
more information, reference our Special Bulk Sales–eBook Licensing web page at
www.apress.com/info/bulksales.
The information in this book is distributed on an “as is” basis, without warranty.
Although every precaution has been taken in the preparation of this work, neither the
author(s) nor Apress shall have any liability to any person or entity with respect to any
loss or damage caused or alleged to be caused directly or indirectly by the information
contained in this work.
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
vii
■ CONTENTS
A Little about Frameworks..................................................................................................................................262
Important Things to Know...................................................................................................................................263
Preinstalled MapKit Apps....................................................................................................................................263
Find Locations................................................................................................................................................264
Get Directions................................................................................................................................................265
See Which Way You’re Facing.......................................................................................................................266
See Traffic......................................................................................................................................................267
Search for a Location.....................................................................................................................................268
Cool and Popular MapKit Apps to Inspire You.....................................................................................................270
MapKit_01: A View-Based Application................................................................................................................271
Possible Prepping for the App........................................................................................................................271
Preliminaries.......................................................................................................................................................273
A New View-Based Template..............................................................................................................................273
Adding the Annotation File.............................................................................................................................274
It’s Already Working!......................................................................................................................................275
Check It Out—the iPad Simulator..................................................................................................................276
Make It Look a Little Bit Better......................................................................................................................277
Dealing with the Implementation...................................................................................................................278
Coding the myPos.h File................................................................................................................................284
The myPos.m File...........................................................................................................................................285
The AppDelegate Files...................................................................................................................................286
Connect MapView with MKMapView.............................................................................................................287
Digging My Students’ MapKit Code....................................................................................................................290
Parsing to MapKit from the Internet...............................................................................................................290
MapKit Parsing...............................................................................................................................................293
Three MapKit Final Projects: CS-201 iPhone Apps, Objective-C................................................................295
Zoom Out … Seeing the Big Picture...................................................................................................................310(cid:1)
■Index............................................................................................................313
viii