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

by: Erica Sadun

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Retail Price: $39.95

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

Description

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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

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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

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  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


Preface

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Preface
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.

Prerequisites
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.

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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.

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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

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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.