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Beginning iOS 5

Development

Exploring the iOS SDK

■ ■ ■

Dave Mark

Jack Nutting

Jeff LaMarche

i

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Beginning iOS 5 Development: Exploring the iOS SDK

Copyright © 2011 by Dave Mark, Jack Nutting, Jeff LaMarche

This work is subject to copyright. All rights are reserved by the Publisher, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfilms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed. Exempted from this legal reservation are brief excerpts in connection with reviews or scholarly analysis or material supplied specifically for the purpose of being entered and executed on a computer system, for exclusive use by the purchaser of the work. Duplication of this publication or parts thereof is permitted only under the provisions of the Copyright Law of the Publisher's location, in its current version, and permission for use must always be obtained from Springer. Permissions for use may be obtained through RightsLink at the Copyright Clearance Center. Violations are liable to prosecution under the respective Copyright Law.

ISBN-13 (pbk): 978-1-4302-3605-4

ISBN-13 (electronic): 978-1-4302-3606-1

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The use in this publication of trade names, trademarks, service marks, and similar terms, even if they are not identified as such, is not to be taken as an expression of opinion as to whether or not they are subject to proprietary rights.

While the advice and information in this book are believed to be true and accurate at the date of publication, neither the authors nor the editors nor the publisher can accept any legal responsibility for any errors or omissions that may be made. The publisher makes no warranty, express or implied, with respect to the material contained herein.

President and Publisher: Paul Manning Lead Editor: Tom Welsh

Technical Reviewer: Mark Dalrymple

Editorial Board: Steve Anglin, Mark Beckner, Ewan Buckingham, Gary Cornell, Morgan Ertel, Jonathan Gennick, Jonathan Hassell, Robert Hutchinson, Michelle Lowman,

James Markham, Matthew Moodie, Jeff Olson, Jeffrey Pepper, Douglas Pundick, Ben Renow-Clarke, Dominic Shakeshaft, Gwenan Spearing, Matt Wade, Tom Welsh

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This book is dedicated to the memory of Steve Jobs.

We continue to be inspired by his spirit and his vision.

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Contents at a Glance

Contents..............................................................................................................	v
About the Authors.............................................................................................	xiv
About the Technical Reviewer ...........................................................................	xv
Acknowledgments ............................................................................................	xvi
Preface ............................................................................................................	xvii
■ Chapter 1: Welcome to the Jungle ..................................................................	1
■ Chapter 2: Appeasing the Tiki Gods ..............................................................	13
■ Chapter 3: Handling Basic Interaction...........................................................	45
■ Chapter 4: More User Interface Fun ..............................................................	69
■ Chapter 5: Autorotation and Autosizing ......................................................	113
■ Chapter 6: Multiview Applications ..............................................................	133
■ Chapter 7: Tab Bars and Pickers .................................................................	163
■ Chapter 8: Introduction to Table Views .......................................................	217
■ Chapter 9: Navigation Controllers and Table Views ....................................	277
■ Chapter 10: Storyboards .............................................................................	353
■ Chapter 11: iPad Considerations .................................................................	381
■ Chapter 12: Application Settings and User Defaults....................................	407
■ Chapter 13: Basic Data Persistence ............................................................	445
■ Chapter 14: Hey! You! Get onto iCloud! .......................................................	493
■ Chapter 15: Grand Central Dispatch, Background Processing, and You .....	525
■ Chapter 16: Drawing with Quartz and OpenGL ............................................	563
■ Chapter 17: Taps, Touches, and Gestures ...................................................	603
■ Chapter 18: Where Am I? Finding Your Way with Core Location.................	633
■ Chapter 19: Whee! Gyro and Accelerometer! ..............................................	645
■ Chapter 20: The Camera and Photo Library ................................................	673
■ Chapter 21: Application Localization...........................................................	685
■ Chapter 22: Where to Next?.........................................................................	705
Index ...............................................................................................................	711

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Contents

Contents at a Glance ..........................................................................................	iv
About the Authors.............................................................................................	xiv
About the Technical Reviewer ...........................................................................	xv
Acknowledgments ............................................................................................	xvi
Preface ............................................................................................................	xvii
■ Chapter 1: Welcome to the Jungle ..................................................................	1
What This Book Is ...................................................................................................................................................	1
What You Need .......................................................................................................................................................	1
Developer Options..............................................................................................................................................	3
What You Need to Know ....................................................................................................................................	4
What’s Different About Coding for iOS? ..................................................................................................................	5
Only One Active Application ...............................................................................................................................	6
Only One Window ...............................................................................................................................................	6
Limited Access...................................................................................................................................................	6
Limited Response Time......................................................................................................................................	6
Limited Screen Size ...........................................................................................................................................	7
Limited System Resources ................................................................................................................................	7
No Garbage Collection, but… ............................................................................................................................	8
Some New Stuff .................................................................................................................................................	8
A Different Approach..........................................................................................................................................	8
What’s in This Book ................................................................................................................................................	9
What’s New in This Update? .................................................................................................................................	11
Are You Ready?.....................................................................................................................................................	11
■ Chapter 2: Appeasing the Tiki Gods ..............................................................	13
Setting Up Your Project in Xcode ..........................................................................................................................	13
The Xcode Workspace Window........................................................................................................................	18
A Closer Look at Our Project ............................................................................................................................	28
Introducing Xcode’s Interface Builder...................................................................................................................	30
What’s in the Nib File? .....................................................................................................................................	32
The Library .......................................................................................................................................................	33
Adding a Label to the View ..............................................................................................................................	34
Changing Attributes .........................................................................................................................................	37

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■ CONTENTS

Some iPhone Polish—Finishing Touches .............................................................................................................	39
Bring It on Home ...................................................................................................................................................	44
■ Chapter 3: Handling Basic Interaction...........................................................	45
The Model-View-Controller Paradigm...................................................................................................................	46
Creating Our Project..............................................................................................................................................	47
Looking at the View Controller..............................................................................................................................	48
Understanding Outlets and Actions..................................................................................................................	49
Cleaning Up the View Controller ......................................................................................................................	51
Designing the User Interface ...........................................................................................................................	52
Trying It Out .....................................................................................................................................................	64
Looking at the Application Delegate .....................................................................................................................	64
Bring It on Home ...................................................................................................................................................	68
■ Chapter 4: More User Interface Fun ..............................................................	69
A Screen Full of Controls ......................................................................................................................................	69
Active, Static, and Passive Controls......................................................................................................................	72
Creating the Application .......................................................................................................................................	73
Implementing the Image View and Text Fields .....................................................................................................	74
Adding the Image View ....................................................................................................................................	74
Resizing the Image View..................................................................................................................................	77
Setting View Attributes ....................................................................................................................................	79
Adding the Text Fields .....................................................................................................................................	82
Creating and Connecting Outlets .....................................................................................................................	89
Closing the Keyboard ............................................................................................................................................	91
Closing the Keyboard When Done Is Tapped ...................................................................................................	91
Touching the Background to Close the Keyboard ............................................................................................	93
Adding the Slider and Label .............................................................................................................................	95
Creating and Connecting the Actions and Outlets ...........................................................................................	97
Implementing the Action Method.....................................................................................................................	98
Implementing the Switches, Button, and Segmented Control ..............................................................................	98
Implementing the Switch Actions ..................................................................................................................	102
Implementing the Segmented Control Action .....................................................................................................	105
Implementing the Action Sheet and Alert ...........................................................................................................	105
Conforming to the Action Sheet Delegate Method .........................................................................................	106
Showing the Action Sheet..............................................................................................................................	106
Spiffing Up the Button.........................................................................................................................................	109
Using the viewDidLoad Method .....................................................................................................................	110
Control States ................................................................................................................................................	111
Stretchable Images ........................................................................................................................................	111
Crossing the Finish Line......................................................................................................................................	112
■ Chapter 5: Autorotation and Autosizing ......................................................	113
The Mechanics of Autorotation ...........................................................................................................................	114
Points, Pixels, and the Retina Display............................................................................................................	114
Autorotation Approaches ...............................................................................................................................	115
Handling Rotation Using Autosize Attributes ......................................................................................................	115
Configuring Supported Orientations...............................................................................................................	116
Specifying Rotation Support ..........................................................................................................................	117
Designing an Interface with Autosize Attributes............................................................................................	118

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	■ CONTENTS
Using the Size Inspector’s Autosize Attributes ..............................................................................................	120
Setting the Buttons’ Autosize Attributes ........................................................................................................	122
Restructuring a View When Rotated ...................................................................................................................	123
Creating and Connecting Outlets ...................................................................................................................	125
Moving the Buttons on Rotation.....................................................................................................................	125
Swapping Views .................................................................................................................................................	126
Designing the Two Views...............................................................................................................................	128
Implementing the Swap .................................................................................................................................	130
Changing Outlet Collections ...........................................................................................................................	131
Rotating Out of Here ...........................................................................................................................................	132
■ Chapter 6: Multiview Applications ..............................................................	133
Common Types of Multiview Apps......................................................................................................................	133
The Architecture of a Multiview Application .......................................................................................................	138
The Root Controller ........................................................................................................................................	141
Anatomy of a Content View............................................................................................................................	142
Building View Switcher .......................................................................................................................................	142
Creating Our View Controller and Nib Files....................................................................................................	144
Modifying the App Delegate...........................................................................................................................	146
Modifying BIDSwitchViewController.h ...........................................................................................................	148
Adding a View Controller ...............................................................................................................................	148
Building a View with a Toolbar ......................................................................................................................	150
Writing the Root View Controller....................................................................................................................	152
Implementing the Content Views ...................................................................................................................	156
Animating the Transition................................................................................................................................	159
Switching Off ......................................................................................................................................................	161
■ Chapter 7: Tab Bars and Pickers .................................................................	163
The Pickers Application ......................................................................................................................................	164
Delegates and Data Sources...............................................................................................................................	169
Setting Up the Tab Bar Framework.....................................................................................................................	170
Creating the Files ...........................................................................................................................................	171
Adding the Root View Controller ....................................................................................................................	172
Creating TabBarController.xib ........................................................................................................................	173
The Initial Test Run ........................................................................................................................................	181
Implementing the Date Picker ............................................................................................................................	182
Implementing the Single-Component Picker ......................................................................................................	186
Declaring Outlets and Actions........................................................................................................................	186
Building the View ...........................................................................................................................................	187
Implementing the Controller As a Data Source and Delegate........................................................................	188
Implementing a Multicomponent Picker .............................................................................................................	192
Declaring Outlets and Actions........................................................................................................................	193
Building the View ...........................................................................................................................................	193
Implementing the Controller ..........................................................................................................................	194
Implementing Dependent Components...............................................................................................................	196
Creating a Simple Game with a Custom Picker ..................................................................................................	203
Writing the Controller Header File..................................................................................................................	203
Building the View ...........................................................................................................................................	204
Adding Image Resources ...............................................................................................................................	205

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Implementing the Controller ..........................................................................................................................	205
Final Details ...................................................................................................................................................	210
Linking in the Audio Toolbox Framework.......................................................................................................	214
Final Spin ............................................................................................................................................................	215
■ Chapter 8: Introduction to Table Views .......................................................	217
Table View Basics ...............................................................................................................................................	218
Table Views and Table View Cells..................................................................................................................	218
Grouped and Plain Tables ..............................................................................................................................	220
Implementing a Simple Table .............................................................................................................................	221
Designing the View ........................................................................................................................................	221
Writing the Controller.....................................................................................................................................	222
Adding an Image ............................................................................................................................................	226
Using Table View Cell Styles ..........................................................................................................................	228
Setting the Indent Level .................................................................................................................................	230
Handling Row Selection .................................................................................................................................	231
Changing the Font Size and Row Height........................................................................................................	233
Customizing Table View Cells .............................................................................................................................	235
Adding Subviews to the Table View Cell........................................................................................................	236
Creating a UITableViewCell Subclass.............................................................................................................	237
Loading a UITableViewCell from a Nib ...........................................................................................................	242
Grouped and Indexed Sections ...........................................................................................................................	248
Building the View ...........................................................................................................................................	248
Importing the Data .........................................................................................................................................	248
Implementing the Controller ..........................................................................................................................	249
Adding an Index .............................................................................................................................................	254
Implementing a Search Bar ................................................................................................................................	255
Rethinking the Design....................................................................................................................................	255
A Deep Mutable Copy.....................................................................................................................................	256
Updating the Controller Header File ...............................................................................................................	258
Modifying the View ........................................................................................................................................	259
Modifying the Controller Implementation ......................................................................................................	264
Putting It All on the Table....................................................................................................................................	276
■ Chapter 9: Navigation Controllers and Table Views ....................................	277
Navigation Controller Basics ...............................................................................................................................	277
Stacky Goodness ...........................................................................................................................................	278
A Stack of Controllers ....................................................................................................................................	278
Nav, a Hierarchical Application in Six Parts........................................................................................................	280
Meet the Subcontrollers ................................................................................................................................	280
The Nav Application’s Skeleton .....................................................................................................................	286
Adding the Images to the Project...................................................................................................................	294
First Subcontroller: The Disclosure Button View ...........................................................................................	295
Second Subcontroller: The Checklist .............................................................................................................	304
Third Subcontroller: Controls on Table Rows.................................................................................................	310
Fourth Subcontroller: Movable Rows.............................................................................................................	317
Fifth Subcontroller: Deletable Rows ..............................................................................................................	324
Sixth Subcontroller: An Editable Detail Pane .................................................................................................	330

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	■ CONTENTS
But There’s One More Thing. . . .....................................................................................................................	349
Breaking the Tape...............................................................................................................................................	352
■ Chapter 10: Storyboards .............................................................................	353
Creating a Simple Storyboard .............................................................................................................................	354
Dynamic Prototype Cells .....................................................................................................................................	358
Dynamic Table Content, Storyboard-Style .....................................................................................................	358
Editing Prototype Cells ...................................................................................................................................	359
Good Old Table View Data Source..................................................................................................................	361
Will It Load? ...................................................................................................................................................	363
Static Cells ..........................................................................................................................................................	364
Going Static....................................................................................................................................................	365
So Long, Good Old Table View Data Source...................................................................................................	366
You Say Segue, I Say Segue ...............................................................................................................................	367
Creating Segue Navigator ..............................................................................................................................	368
Filling the Blank Slate ....................................................................................................................................	369
First Transition ...............................................................................................................................................	372
A Slightly More Useful Task List ....................................................................................................................	372
Viewing Task Details......................................................................................................................................	373
Make More Segues, Please ...........................................................................................................................	374
Passing a Task from the List..........................................................................................................................	374
Handling Task Details ....................................................................................................................................	376
Passing Back Details .....................................................................................................................................	377
Making the List Receive the Details...............................................................................................................	378
If Only We Could End with a Smooth Transition.............................................................................................	379
■ Chapter 11: iPad Considerations .................................................................	381
Split Views and Popovers ...................................................................................................................................	381
Creating a SplitView Project ..........................................................................................................................	383
The Storyboard Defines the Structure ...........................................................................................................	385
The Code Defines the Functionality ...............................................................................................................	387
Here Come the Presidents ..................................................................................................................................	394
Creating Your Own Popover ................................................................................................................................	401
iPad Wrap-Up ......................................................................................................................................................	406
■ Chapter 12: Application Settings and User Defaults....................................	407
Getting to Know Your Settings Bundle ................................................................................................................	407
The AppSettings Application ...............................................................................................................................	410
Creating the Project .......................................................................................................................................	414
Working with the Settings Bundle .................................................................................................................	415
Reading Settings in Our Application ..............................................................................................................	431
Registering Default Values.............................................................................................................................	436
Changing Defaults from Our Application........................................................................................................	437
Keeping It Real...............................................................................................................................................	440
Beam Me Up, Scotty ...........................................................................................................................................	443
■ Chapter 13: Basic Data Persistence ............................................................	445
Your Application’s Sandbox ................................................................................................................................	446
Getting the Documents Directory...................................................................................................................	447
Getting the tmp Directory...............................................................................................................................	448
File-Saving Strategies.........................................................................................................................................	448

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Single-File Persistence ..................................................................................................................................	448
Multiple-File Persistence ...............................................................................................................................	449
Using Property Lists ............................................................................................................................................	449
Property List Serialization ..............................................................................................................................	449
The First Version of the Persistence Application ...........................................................................................	451
Archiving Model Objects .....................................................................................................................................	456
Conforming to NSCoding................................................................................................................................	457
Implementing NSCopying ..............................................................................................................................	458
Archiving and Unarchiving Data Objects........................................................................................................	459
The Archiving Application ..............................................................................................................................	460
Using iOS’s Embedded SQLite3 ..........................................................................................................................	463
Creating or Opening the Database .................................................................................................................	464
Using Bind Variables ......................................................................................................................................	466
The SQLite3 Application .................................................................................................................................	467
Using Core Data ..................................................................................................................................................	473
Entities and Managed Objects .......................................................................................................................	475
The Core Data Application .............................................................................................................................	479
Persistence Rewarded ........................................................................................................................................	491
■ Chapter 14: Hey! You! Get onto iCloud! .......................................................	493
Managing Document Storage with UIDocument .................................................................................................	494
Building TinyPix .............................................................................................................................................	494
Creating BIDTinyPixDocument .......................................................................................................................	495
Code Master...................................................................................................................................................	499
Initial Storyboarding.......................................................................................................................................	505
Creating BIDTinyPixView ................................................................................................................................	508
Storyboard Detailing ......................................................................................................................................	513
Adding iCloud Support ........................................................................................................................................	516
Creating a Provisioning Profile.......................................................................................................................	517
Enabling iCloud Entitlements .........................................................................................................................	518
How to Query .................................................................................................................................................	518
Save Where? ..................................................................................................................................................	520
Storing Preferences on iCloud .......................................................................................................................	521
What We Didn’t Cover .........................................................................................................................................	522
■ Chapter 15: Grand Central Dispatch, Background Processing, and You .....	525
Grand Central Dispatch .......................................................................................................................................	525
Introducing SlowWorker .....................................................................................................................................	526
Threading Basics ................................................................................................................................................	530
Units of Work ......................................................................................................................................................	531
GCD: Low-Level Queueing ..................................................................................................................................	531
Becoming a Blockhead ..................................................................................................................................	532
Improving SlowWorker ..................................................................................................................................	533
Background Processing ......................................................................................................................................	539
Application Life Cycle.....................................................................................................................................	541
State-Change Notifications ............................................................................................................................	541
Creating State Lab .........................................................................................................................................	543
Exploring Execution States ............................................................................................................................	544
Making Use of Execution State Changes .......................................................................................................	546

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	■ CONTENTS
Handling the Inactive State ............................................................................................................................	547
Handling the Background State .....................................................................................................................	552
Grand Central Dispatch, Over and Out ................................................................................................................	562
■ Chapter 16: Drawing with Quartz and OpenGL ............................................	563
Two Views of a Graphical World .........................................................................................................................	563
The Quartz 2D Approach to Drawing...................................................................................................................	564
Quartz 2D’s Graphics Contexts ......................................................................................................................	565
The Coordinate System ..................................................................................................................................	566
Specifying Colors ...........................................................................................................................................	567
Drawing Images in Context ............................................................................................................................	569
Drawing Shapes: Polygons, Lines, and Curves ..............................................................................................	569
Quartz 2D Tool Sampler: Patterns, Gradients, and Dash Patterns .................................................................	570
The QuartzFun Application ..................................................................................................................................	572
Setting Up the QuartzFun Application ............................................................................................................	572
Adding Quartz 2D Drawing Code....................................................................................................................	584
Optimizing the QuartzFun Application............................................................................................................	589
The GLFun Application ........................................................................................................................................	592
Setting Up the GLFun Application ..................................................................................................................	593
Creating BIDGLFunView .................................................................................................................................	594
Updating BIDViewController ...........................................................................................................................	601
Updating the Nib ............................................................................................................................................	602
Finishing GLFun .............................................................................................................................................	602
Drawing to a Close..............................................................................................................................................	602
■ Chapter 17: Taps, Touches, and Gestures ...................................................	603
Multitouch Terminology ......................................................................................................................................	604
The Responder Chain ..........................................................................................................................................	604
Responding to Events ....................................................................................................................................	605
Forwarding an Event: Keeping the Responder Chain Alive ............................................................................	606
The Multitouch Architecture ...............................................................................................................................	606
The Four Touch Notification Methods .................................................................................................................	607
The TouchExplorer Application ...........................................................................................................................	608
The Swipes Application.......................................................................................................................................	613
Automatic Gesture Recognition .....................................................................................................................	616
Implementing Multiple Swipes ......................................................................................................................	618
Detecting Multiple Taps ......................................................................................................................................	620
Detecting Pinches ...............................................................................................................................................	625
Defining Custom Gestures ..................................................................................................................................	627
The CheckPlease Application.........................................................................................................................	628
The CheckPlease Touch Methods ..................................................................................................................	630
Garçon? Check, Please! ......................................................................................................................................	632
■ Chapter 18: Where Am I? Finding Your Way with Core Location.................	633
The Location Manager ........................................................................................................................................	634
Setting the Desired Accuracy ........................................................................................................................	634
Setting the Distance Filter .............................................................................................................................	634
Starting the Location Manager ......................................................................................................................	635
Using the Location Manager Wisely...............................................................................................................	635
The Location Manager Delegate .........................................................................................................................	635

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■ CONTENTS

Getting Location Updates ...............................................................................................................................	636
Getting Latitude and Longitude Using CLLocation .........................................................................................	636
Error Notifications ..........................................................................................................................................	638
Trying Out Core Location ....................................................................................................................................	639
Updating Location Manager ...........................................................................................................................	643
Determining Distance Traveled......................................................................................................................	644
Wherever You Go, There You Are ........................................................................................................................	644
■ Chapter 19: Whee! Gyro and Accelerometer! ..............................................	645
Accelerometer Physics .......................................................................................................................................	645
Don’t Forget Rotation ..........................................................................................................................................	646
Core Motion and the Motion Manager ................................................................................................................	647
Event-Based Motion.......................................................................................................................................	647
Proactive Motion Access................................................................................................................................	653
Accelerometer Results...................................................................................................................................	655
Detecting Shakes ................................................................................................................................................	656
Baked-In Shaking ..........................................................................................................................................	657
Shake and Break............................................................................................................................................	658
Accelerometer As Directional Controller .............................................................................................................	664
Rolling Marbles ..............................................................................................................................................	664
Writing the Ball View......................................................................................................................................	666
Calculating Ball Movement ............................................................................................................................	669
Rolling On............................................................................................................................................................	672
■ Chapter 20: The Camera and Photo Library ................................................	673
Using the Image Picker and UIImagePickerController ........................................................................................	673
Implementing the Image Picker Controller Delegate ..........................................................................................	675
Road Testing the Camera and Library.................................................................................................................	677
Designing the Interface..................................................................................................................................	679
Implementing the Camera View Controller ....................................................................................................	679
It’s a Snap! ..........................................................................................................................................................	684
■ Chapter 21: Application Localization...........................................................	685
Localization Architecture ....................................................................................................................................	685
Strings Files ........................................................................................................................................................	687
What’s in a Strings File? ................................................................................................................................	687
The Localized String Macro ...........................................................................................................................	688
Real-World iOS: Localizing Your Application.......................................................................................................	688
Setting Up LocalizeMe ...................................................................................................................................	689
Trying Out LocalizeMe ...................................................................................................................................	693
Localizing the Nib ..........................................................................................................................................	694
Localizing an Image .......................................................................................................................................	698
Generating and Localizing a Strings File .......................................................................................................	701
Localizing the App Display Name...................................................................................................................	703
Auf Wiedersehen.................................................................................................................................................	704
■ Chapter 22: Where to Next?.........................................................................	705
Apple’s Documentation .......................................................................................................................................	705
Mailing Lists........................................................................................................................................................	706
Discussion Forums..............................................................................................................................................	706
Web Sites ............................................................................................................................................................	707

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	■ CONTENTS
Blogs ...................................................................................................................................................................	708
Conferences ........................................................................................................................................................	708
Follow the Authors ..............................................................................................................................................	710
Farewell ..............................................................................................................................................................	710
Index ...............................................................................................................	711

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