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Learning Objective-C 2.0: A Hands-on Guide to Objective-C for Mac and iOS Developers, 2nd Edition

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Learning Objective-C 2.0: A Hands-on Guide to Objective-C for Mac and iOS Developers, 2nd Edition

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  • Copyright 2013
  • Dimensions: 7" x 9"
  • Edition: 2nd
  • eBook (Watermarked)
  • ISBN-10: 0-13-304740-7
  • ISBN-13: 978-0-13-304740-0

Get Started Fast with Objective-C 2.0 Programming for OS X Mountain Lion, iOS 5.1, and Beyond

Fully updated for Xcode 4.4, Learning Objective-C 2.0, Second Edition, is today’s most useful beginner’s guide to Objective-C 2.0. One step at a time, it will help you master the newest version of Objective-C 2.0 and start writing high-quality programs for OS X 10.8 Mountain Lion, iOS 5.1, and all of Apple’s newest computers and devices.

Top OS X and iOS developer Robert Clair first reviews the essential object and C concepts that every Objective-C 2.0 developer needs to know. Next, he introduces the basics of the Objective-C 2.0 language itself, walking through code examples one line at a time and explaining what’s happening behind the scenes.

This revised edition thoroughly introduces Apple’s new Automated Reference Counting (ARC), while also teaching conventional memory-management techniques that remain indispensable. Carefully building on what you’ve already learned, Clair progresses to increasingly sophisticated techniques in areas ranging from frameworks to security. Every topic has been carefully chosen for its value in real-world, day-to-day programming, and many topics are supported by hands-on practice exercises.

Coverage includes

·      Reviewing key C techniques and concepts, from program structure and formats to variables and scope

·      Understanding how objects and classes are applied in Objective-C 2.0

·      Writing your first Objective-C program with Xcode 4.4

·      Using messaging to efficiently perform tasks with objects

·      Getting started with Apple’s powerful frameworks and foundation classes

·      Using Objective-C control structures, including Fast Enumeration and exception handling

·      Adding methods to classes without subclassing

·      Using declared properties to save time and simplify your code

·      Mastering ARC and conventional memory management, and knowing when to use each

·      Using Blocks to prepare for concurrency with Apple’s Grand Central Dispatch

·      Leveraging Xcode 4.4 improvements to enums and @implementation

Sample Content

Table of Contents

Preface xxv

Acknowledgments xxxv

About the Author xxxvii

Part I: Introduction to Objective-C 1

Chapter 1: C, the Foundation of Objective-C 3

The Structure of a C Program 4

Variables 8

Operators 16

Expressions and Statements 21

Program Flow 23

Preprocessor 33

Command Line Compiling and Debugging 37

Summary 39

Exercises 39

Chapter 2: More about C Variables 43

Memory Layout of a C Program 43

Automatic Variables 44

External Variables 46

Declaration Keywords 46

Scope 50

Dynamic Allocation 51

Summary 54

Exercises 55

Chapter 3: An Introduction to Object-Oriented Programming 57

Object-Oriented Programming 57

An Introduction to Objective-C 60

Objective-C Additions 68

Summary 74

Chapter 4: Your First Objective-C Program 75

Building with Xcode 75

Objective-C Program Structure 79

An Object-Oriented “Hello World” 83

main.m 90

Summary 92

Exercises 92

Part II: Language Basics 95

Chapter 5: Messaging 97

Methods 97

A Simple Method 97

Methods with Arguments 98

Messaging 100

Messaging Details 103

Under the Hood 111

Message Forwarding 113

Efficiency 114

Introspection and Other Runtime Fun 115

Summary 117

Exercises 117

Chapter 6: Classes and Objects 119

Defining a Class 119

Subclassing a Class 123

Creating Objects 131

Destroying Objects 139

Copying Objects 141

Summary 146

Exercises 146

Chapter 7: The Class Object 149

Class Objects 149

Other Class Methods 153

Mimicking Class Variables 158

Summary 163

Exercises 164

Chapter 8: Frameworks 167

What Is a Framework? 168

Cocoa and Cocoa Touch 169

AppKit 170

UIKit 171

Core Foundation 172

Core Graphics 175

Core Animation 176

Other Apple-Supplied Frameworks 176

Third-Party Frameworks 177

Under the Hood 178

Summary 179

Chapter 9: Common Foundation Classes 181

Immutable and Mutable Classes 181

Class Clusters 182

NSString 183

Collection Classes 188

NSNumber 193

NSNull 195

NSData 196


Objective-C Literals and Object Subscripting 198

Structures 204

Geometry Structures on iOS 206

Summary 206

Exercises 207

Chapter 10: Control Structures in Objective-C 209

if Statements 209

for Statements and Implicit Loops 213

while Statements and NSEnumerator 215

Fast Enumeration 217

An Example Using Fast Enumeration 220

Exceptions 223

Summary 229

Exercises 230

Chapter 11: Categories, Extensions, and Security 233

Categories 233

Associative References 238

Extensions 240

Instance Variable Scope (Access Control) 242

Hiding Your Instance Variable Declarations 243

Access Control for Methods 246

Namespaces 246

Security 246

Calling C Functions from Objective-C 250

Summary 251

Exercises 251

Chapter 12: Properties 253

Accessing Instance Variables Outside of an Object (Don’t Do It) 254

Declaring and Implementing Accessors 255

Accessors Using Properties 258

Synthesized Instance Variables 260

@synthesize by Default 261

Synthesis Summary 262

Private Properties 263

The @property Statement 263

More about @dynamic 266

Properties without Instance Variables 267

Properties and Memory Management 268

A Look Ahead at Automatic Reference Counting (ARC) 269

Subclassing and Properties 270

Hidden Setters for readonly Properties 271

Properties as Documentation 272

Dot Syntax 272

Summary 276

Exercises 277

Chapter 13: Protocols 279

The Rationale for Protocols 279

Using Protocols 280

TablePrinter 285

FruitBasket 287

main 288

A Problem 289

Implement the Optional Methods 290

Protocol Objects and Testing for Conformance 291

Informal Protocols 291

Summary 292

Exercises 293

Part III: Advanced Concepts 295

Chapter 14: Memory Management Overview 297

The Problem 298

The Solutions: Objective-C Memory Management 299

Onward 300

Chapter 15: Reference Counting 301

Reference Counting Basics 301

Receiving Objects 303

Ownership 305

dealloc 306

Returning Objects 308

retainCount 314

Multithreading 314

When Retain Counts Go Bad 316

Retain Cycles 319

The Final Goodbye: When Programs Terminate 321

Summary 322

Exercises 323

Chapter 16: ARC 325

What ARC Is and Is Not 326

How ARC Works 326

ARC Imposes Some Rules 328

New Variable Qualifiers 332

Properties 336

Retain Cycles 337

ARC and Core Foundation 340

Casting to and from void* 343

ARC and Extra Autorelease Pools 346

ARC and Exceptions 346

Using ARC 347

ARC Uses Runtime Functions 349

More Information 349

Summary 350

Exercises 351

Chapter 17: Blocks 353

Function Pointers 354

NSInvocation 359

Blocks 362

Some Philosophical Reservations 377

Summary 378

Exercises 378

Chapter 18: A Few More Things 381

Enums with a Fixed Underlying Type 381

Forward Declarations of Methods in the @implementation Block Are No Longer Needed 384

Some New Documentation 387

Summary 387

Exercises 387

Part IV: Appendices 389

Appendix A: Reserved Words and Compiler Directives 391

Appendix B: Toll-Free Bridged Classes 393

Appendix C: 32- and 64-Bit 395

Kernel and User Programs in 64-Bit 396

Coding Differences for 64-Bit Programs 396

Performance 396

Compiling for 32-Bit and 64-Bit 397

More Information 398

Appendix D: The Fragile Base Class Problem 399

Appendix E: Resources for Objective-C 401

Apple Resources 401

Internet Resources 402

Groups 402

Books 403

Index 405


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