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iPhone Developer's Cookbook, The: Building Applications with the iPhone SDK

by: Erica Sadun

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Publisher: ,Oct 13, 2008

Category: Iphone and Ipod Level: B/I/A

ISBN: 0321555457
ISBN13: 9780321555458

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The "iPhone Developer's Cookbook" provides readers with the skills they need to build applications for the iPhone by presenting them with recipes they can apply to their applications, rather than an exhaustive documentation. This approach allows the reader to quickly get up to speed and start building apps for the iPhone right away.

Features and Benefits

Shows readers how to develop native applications to run on the iPhone and iPod touch
Illustrates use of Apple's SDK, including setting up your build and test environment
Includes useful code recipes that readers can take and use in their own applications



The iPhone Developer's Cookbook offers single-task recipes for the most common issues new iPhone developers face: laying out interface elements, responding to users, accessing local data sources, and connecting to the Internet. This Cookbook approach delivers cut and paste convenience. Programmers can add source recipes into their projects and then customize them to their needs. Each chapter groups related tasks together. Readers can jump directly to the kind of solution they're looking for without having to decide which class or framework best matches that problem.

Features and Benefits


Shows readers how to develop native applications to run on the iPhone and iPod touch
Illustrates use of Apple's SDK, including setting up your build and test environment
Includes useful code recipes that readers can take and use in their own applications

Table of Contents


  Preface xvii

  Acknowledgments xxi

  About the Author xxii

1 Introducing the iPhone SDK 1

  Apple's iPhone SDK 1

  Assembling iPhone Projects 2

  iPhone Application Components 4

          Application Folder Hierarchy 4

          The Executable 4

          The Info.plist File 4

          The Icon and Default Images 6

          XIB (NIB) files 6

          Files Not Found in the Application Bundle 7

          Sandboxes 7

  Platform Limitations 8

          Storage Limits 8

          Data Access Limits 8

          Memory Limits 8

          Interaction Limits 9

          Energy Limits 9

          Application Limits 9

          User Behavior Limits 10

  SDK Limitations 10

  Programming Paradigms 11

          Object-Oriented Programming 11

          Model-View-Controller 11

  Building an iPhone Application Skeleton 18

  The Hello World Application 19

          The Classes 19

          The Code 20

          A Note About Sample Code and Memory Management 20

  Building Hello World 23

          Create an iPhone Project 23

          Running the Skeleton 24

          Customize the iPhone Project 24

          Editing Identification Information 25

          Using the Debugger 26

  Apple's iPhone Developer Program 28

          Development Phones 28

          Application Identifiers 29

  From Xcode to Your iPhone: The Organizer Interface 30

          Projects and Sources List 30

          Devices List 31

          Summary Tab 31

          Console Tab 31

          Crash Logs Tab 31

          Screenshot Tab 32

          About Tethering 32

          Testing Applications on Your iPhone 32

          Compiling for Distribution 33

  Using Undocumented API Calls 34

  Ad Hoc Distribution 35

  Summary 36

2 Views 37

  UIView and UIWindow 37

          Hierarchy 37

          Geometry and Traits 39

          Gestures 42

  Recipe: Adding Stepwise Subviews 42

          Reorienting 44

  Recipe: Dragging Views 45

          UITouch 46

          Adding Persistence 48

  Recipe: Clipped Views 51

          Balancing Touches with Clipping 53

          Accessing Pixel-by-Pixel Values 54

  Recipe: Detecting Multitouch 56

  UIView Animations 59

          Building UIView Animation Blocks 59

  Recipe: Fading a View In and Out 60

  Recipe: Swapping Views 62

  Recipe: Flipping Views 64

  Recipe: Applying CATransitions to Layers 66

          Undocumented Animation Types 67

          General Core Animation Calls 68

  Recipe: Swiping Views 69

  Recipe: Transforming Views 72

          Centering Landscape Views 74

  Summary 74

3 View Controllers 77

  View Management 77

          Core Classes 77

          Specialized Classes 78

          Creating a UIViewController 79

  Working with Interface Builder to Build Views for

  UIViewControllers 81

          Temperature Conversion Example 81

          Loading XIB Files Directly 90

  Navigation Controllers 91

          Setting Up a Navigation Controller 91

          Pushing and Popping View Controllers 92

          The Navigation Item Class 92

  Recipe: Building a Simple Two-Item Menu 93

  Recipe: Adding a Segmented Control 95

  Recipe: Adding a UIToolbar to a Navigation Bar 97

  Recipe: Navigating Between View Controllers 100

          Popping Back to the Root 102

          Loading a View Controller Array 102

  Tab Bars 103

  Summary 106

4 Alerting Users 107

  Talking Directly to Your User Through Alerts 107

          Logging Your Results 108

          Building Alerts 109

          Displaying the Alert 110

  Recipe: Creating Multiline Button Displays 110

  Recipe: Autotimed No-Button Alerts 112

  Recipe: Soliciting Text Input from the User 113

  Recipe: Presenting Simple Menus 115

  "Please Wait": Showing Progress to Your User 117

  Recipe: Invoking the Basic Undocumented UIProgressHUD 117

  Recipe: Using UIActivityIndicatorView 119

  Recipe: Building a UIProgressView 121

  Recipe: Adding Custom, Tappable Overlays 123

  Recipe: Building a Scroll-Down Alert 127

  Recipe: Adding Status Bar Images 131

  Adding Application Badges 132

  Recipe: Simple Audio Alerts 134

          Vibration 136

  Summary 136

5 Basic Tables 139

  Introducing UITableView and UITableViewController 139

          Creating the Table 140

          What the UITableViewController Does 141

  Recipe: Creating a Simple List Table 142

          Data Source Functions 142

          Reusing Cells 143

          Font Table Sample 143

  Recipe: Creating a Table-Based Selection Sheet 145

  Recipe: Loading Images into Table Cells 149

  Recipe: Setting a Cell's Text Traits 151

  Removing Cell Selections 152

  Recipe: Creating Complex Cells 153

  Recipe: Creating Checked Selections 155

  Recipe: Deleting Cells 157

          Creating and Displaying Remove Controls 157

          Dismissing Remove Controls 158

          Handling Delete Requests 158

          Swiping Cells 158

          Adding Cells 159

  Recipe: Reordering Cells 161

  Recipe: Working with Disclosures 162

  Summary 164


6 Advanced Tables 165

  Recipe: Grouping Table Selections 165

          Building a Section-Based Data Source 166

          Adding Section Headers 170

  Recipe: Building a Section Table with an Index 171

  Recipe: Custom Cell Backgrounds 172

          Customizing the Table View 176

  Recipe: Creating Alternate Blue and White Cells 177

  Recipe: Framing Tables 179

  Recipe: Adding Coupled Cell Controls 180

  Recipe: Building a Multiwheel Table 182

          Creating the UIPickerView 183

  Recipe: Using the UIDatePicker 186

          Creating the Date Picker 186

  Recipe: Creating Fully Customized Group Tables 189

          Creating Grouped Preferences Tables 189

  Summary 195

7 Media 197

  Recipe: Browsing the Documents Folder by File Type 197

          Locating Documents 198

  Loading and Viewing Images 200

  Recipe: Displaying Small Images 201

  Recipe: Using a UIWebView to Display Images 203

          Displaying Web Pages with UIWebView 205

  Recipe: Browsing Your Image Library 206

  Recipe: Selecting and Customizing Images from the Camera Roll 209

  Recipe: Snapping Pictures with the iPhone Camera 212

  Working with iPhone Audio 214

  Recipe: Playing Audio with Celestial 215

  Recipe: Using the Media Player for Audio and Video Playback 217

  Recipe: Recording Audio 219

  Reading in Text Data 227

          Displaying Property Lists 227

  Recovering Media from Backup Files 228

  Summary 229

8 Controls 231

  Recipe: Building Simple Buttons 231

          The UIButton class 232

          Building Custom Buttons 233

          Glass Buttons 236

  Recipe: Adding Animated Elements to Buttons 236

  Recipe: Animating Button Responses 238

  Recipe: Customizing Switches 239

          Customizing UIAlertView Buttons 241

  Recipe: Adding Custom Slider Thumbs 242

          Adding Text to the Slider 246

  Recipe: Dismissing a UITextField Keyboard 246

  Recipe: Dismissing UITextView Keyboards 248

  Recipe: Adding an Undo Button to Text Views 250

  Recipe: Creating a Text View-Based HTML Editor 253

  Recipe: Building an Interactive Search Bar 255

  Recipe: Adding Callout Views 258

  Adding a Page Indicator Control 260

  Recipe: Customizing Toolbars 263

          Toolbar Tips 266

  Summary 267

9 People, Places, and Things 269

  Address Book Frameworks 269

          Address Book UI 269

          Address Book 270

  Recipe: Accessing Address Book Image Data 271

  Recipe: Displaying Address Book Information 273

  Recipe: Browsing the Address Book 274

          Browsing for (Only) E-Mail Addresses 277

          Adding New Contacts 277

  Core Location 278

          How Core Location Works 278

  Recipe: Core Location in a Nutshell 280

  Recipe: Reverse Geocoding to an Address 283

  Recipe: Accessing Maps Using Core Location Data 286

  Recipe: Accessing Core Device Information 288

  Recipe: Enabling and Disabling the Proximity Sensor 289

  Recipe: Using Acceleration to Locate "Up" 290

  Recipe: Using Acceleration to Move Onscreen Objects 292

  Summary 295

10 Connecting to Services 297

  Recipe: Adding Custom Settings Bundles 297

          Declaring Application Settings 297

  Recipe: Subscribing Applications to Custom URL Schemes 302

  Recipe: Checking Your Network Status 304

          Testing the Network Status 304

          Recovering a Local IP Address 305

          Querying Site IP Addresses 306

          Checking Site Availability 307

  Recipe: Interacting with iPhone Databases 308

  Recipe: Converting XML into Trees 311

  Recipe: Storing and Retrieving Keychain Items 313

                  Storing Multiple Keychain Values 318

                  Keychain Persistence 319

  Sending and Receiving Files 320

  Recipe: Building a Simple Web-Based Server 321

  Push Notifications 325

  Summary 326

11 One More Thing: Programming Cover Flow 327

  The UICoverFlowLayer Class 327

  Building a Cover Flow View 329

  Building a Cover Flow View Controller 331

          Cover Flow Data Source Methods 332

          Cover Flow Delegate Methods 333

  Summary 336

Index 357



Few platforms match the iPhone's unique developer technologies. It combines OS X-based mobile computing with an innovative multitouch screen, location awareness, an onboard accelerometer, and more. When Apple introduced the iPhone Cocoa Touch SDK beta in early March 2008, developers responded in numbers that brought Apple's servers to its knees. Apple delivered more than one hundred thousand SDK downloads in less than one week. The iPhone Developer's Cookbook was written to address this demand, providing an accessible resource for those new to iPhone programming.

Who This Book Is For
This book is written for new iPhone developers with projects to get done and a new unfamiliar SDK in their hands. Although each programmer brings different goals and experiences to the table, most developers end up solving similar tasks in their development work: "How do I build a table?"; "How do I create a secure keychain entry?"; "How do I search the Address Book?"; "How do I move between views?"; and "How do I use Core Location?"

The iPhone Developer's Cookbook is aimed squarely at anyone just getting started with iPhone programming. With its clear, fully documented examples, it will get you up to speed and working productively. It presents already tested ready-to-use solutions, letting programmers focus on the specifics of their application rather than on boilerplate tasks.

How This Book Is Structured
This book offers single-task recipes for the most common issues new iPhone developers face: laying out interface elements, responding to users, accessing local data sources, and connecting to the Internet. The cookbook approach delivers cut-and-paste convenience. Programmers can add source recipes into their projects and then customize them to their needs. Each chapter groups related tasks together. Readers can jump directly to the kind of solution they're looking for without having to decide which class or framework best matches that problem.

Here's a rundown of what you'll find in this book's chapters:

Chapter 1: Getting Started with the iPhone SDK

Chapter 1 introduces the iPhone SDK and explores the iPhone as a delivery platform, limitations and all. It explains the breakdown of the standard iPhone application and enables you to build your first Hello World style samples.

Chapter 2: Views

Chapter 2 introduces iPhone views, objects that live on your screen. You see how to lay out, create, and order your views to create backbones for your iPhone applications. You read about view hierarchies, geometries, and animations as well as how users can interact with views through touch.

Chapter 3: View Controllers

The iPhone paradigm in a nutshell is this: small screen, big virtual worlds. In Chapter 3, you discover the various UIViewController classes that enable you to enlarge and order the virtual spaces your users interact with. You learn how to let these powerful objects perform all the heavy lifting when navigating between iPhone application screens.

Chapter 4: Alerting Users

The iPhone offers many ways to provide users with a heads up, from pop-up dialogs and progress bars to audio pings and status bar updates. Chapter 4 shows how to build these indications into your applications and expand your user-alert vocabulary.

Chapter 5: Basic Tables

Tables provide an interaction class that works particularly well on a small, cramped device. Many, if not most, apps that ship with the iPhone and iPod touch center on tables, including Settings, YouTube, Stocks, and Weather. Chapter 5 shows how iPhone tables work, what kinds of tables are available to you as a developer, and how you can use table features in your own programs.

Chapter 6: Advanced Tables

iPhone tables do not begin and end with simple scrolling lists. You can build tables with titled sections, with multiple scrolling columns, and more. You can add controls such as switches, create translucent cell backgrounds, and include custom fonts. Chapter 6 starts from where "Basic Tables" left off. It introduces advanced table recipes for you to use in your iPhone programs.

Chapter 7: Media

As you'd expect, the iPhone can load and display media from a wide variety of formats. It does music; it does movies. It handles images and Web pages. You can present PDF documents and photo albums and more. Chapter 7 shows way after way that you can import or download data into your program and display that data using the iPhone's multitouch interface.

Chapter 8: Control

The UIControl class provides the basis for many iPhones interactive elements, including buttons, text fields, sliders, and switches. Chapter 8 introduces controls and their use, both through well-documented SDK calls and through less-­documented ones.

Chapter 9: People, Places, and Things

In addition to standard user interface controls and media components that you'd see on any computer, the iPhone SDK provides a number of tightly focused developer solutions specific to iPhone and iPod touch delivery. Chapter 9 introduces the most useful of these, including Address Book access ("people"), core location ("places"), and sensors ("things").

Chapter 10: Connecting to Services

As an Internet-connected device, the iPhone is particularly suited to subscribing to Web-based services. Apple has lavished the platform with a solid grounding in all kinds of network computing services and their supporting technologies. The iPhone SDK handles sockets, password keychains, SQL access, XML processing, and more. Chapter 10 surveys common techniques for network computing and offering recipes that simplify day-to-day tasks.

Chapter 11: One More Thing: Programming Cover Flow

Although Cover Flow is not officially included in the iPhone SDK, it offers one of the nicest and most beautiful features of the iPhone experience. With Cover Flow, you can offer your users a gorgeously intense visual selection experience that puts standard scrolling lists to shame. Chapter 11 introduces Cover Flow and shows how you can use it in your applications.

Here are basics you need on hand to begin programming for the iPhone or iPod touch:

A copy of Apple's iPhone SDK. Download your copy of the iPhone SDK from Apple's iPhone Dev Center (http://developer.apple.com/iphone/). You must join Apple's (free) developer program before you download.
An iPhone or iPod touch. Although Apple supplies a simulator as part of its SDK, you really do need to have an actual unit to test on if you're going to develop any serious software. You'll be able to use the cable that shipped with your iPhone or iPod touch to tether your unit to the computer and install the software you've built.
An Apple iPhone Developer License. You will not be able to test your software on an actual iPhone or iPod touch until you join Apple's iPhone Developer program (http://developer.apple.com/iphone/program). Members receive a certificate that allows them to sign their applications and download them to the platforms in question for testing and debugging. The program costs $99/year for individuals and companies, $299/year for in-house enterprise development.
An Intel-based Macintosh running Leopard. The SDK requires a Macintosh running Leopard OS X 10.5.3 or later. Apple requires an Intel-based computer in 32-bit mode. Many features do not work properly on PPC-based Macs or Intel Macs in 64-bit mode. Reserve plenty of disk space and at least 1GB of RAM.
At least one available USB 2.0 port. This enables you to tether your development iPhone or iPod touch to your computer for file transfer and testing.
An Internet connection. This connection enables you to test your programs with a live WiFi connection as well as with EDGE.
Familiarity with Objective-C. The SDK is built around Objective-C 2.0. The language is based on standard C with object-oriented extensions. If you have any object-oriented and C background, making the move to Objective-C is both quick and simple. Consult any Objective-C/Cocoa reference book to get up to speed.


Note - Although the SDK supports development for the iPhone and iPod touch, as well as possible yet-to-be-announced platforms, this book refers to the target platform as iPhone for the sake of simplicity. When developing for the touch, most material is applicable. This excludes certain obvious features such as telephony and onboard speakers. This book attempts to note such exceptions in the manuscript.


Contacting the Author
If you have any comments or questions about this book, please drop me an e-mail ­message at erica@ericasadun.com or stop by http://www.ericasadun.com. My Web site hosts many of the applications discussed in this book. Please feel free to visit, download ­software, read documentation, and leave your comments.

© Copyright Pearson Education. All rights reserved.

About the Authors


Erica Sadun has written, coauthored, and contributed to about three dozen books about technology, particularly in the areas of programming, digital video, and digital photography. An unrepentant geek, Sadun has never met a gadget she didn't need. Her checkered past includes run-ins with NeXT, Newton, iPhone, and myriad successful and unsuccessful technologies. When not writing, she and her geek husband parent three adorable geeks-in-training, who regard their parents with restrained bemusement.