Learning Objective-C 2.0

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