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Effective Objective-C 2.0: 52 Specific Ways to Improve Your iOS and OS X Programs / Edition 1

Effective Objective-C 2.0: 52 Specific Ways to Improve Your iOS and OS X Programs / Edition 1

by Matt Galloway
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Product Details

ISBN-13: 9780321917010
Publisher: Addison-Wesley
Publication date: 05/30/2013
Series: Effective Software Development Series
Pages: 288
Product dimensions: 6.90(w) x 9.00(h) x 0.90(d)

About the Author

Matt Galloway is a software engineer and programming enthusiast specializing in mobile app development. He studied engineering at the University of Cambridge, England, and graduated in 2007 specializing in electrical and information sciences. He owns a consultancy, Swipe Stack Ltd., and answers questions about Objective-C, iOS, and Mac programming on Stack Overflow (

Table of Contents

Preface xi

Acknowledgments xv

About the Author xvii

Chapter 1: Accustoming Yourself to Objective-C 1

Item 1: Familiarize Yourself with Objective-C’s Roots 1

Item 2: Minimize Importing Headers in Headers 4

Item 3: Prefer Literal Syntax over the Equivalent Methods 8

Item 4: Prefer Typed Constants to Preprocessor #define 12

Item 5: Use Enumerations for States, Options, and Status Codes 17

Chapter 2: Objects, Messaging, and the Runtime 25

Item 6: Understand Properties 25

Item 7: Access Instance Variables Primarily Directly When Accessing Them Internally 33

Item 8: Understand Object Equality 36

Item 9: Use the Class Cluster Pattern to Hide Implementation Detail 42

Item 10: Use Associated Objects to Attach Custom Data to Existing Classes 47

Item 11: Understand the Role of objc_msgSend 50

Item 12: Understand Message Forwarding 54

Item 13: Consider Method Swizzling to Debug Opaque Methods 62

Item 14: Understand What a Class Object Is 66

Chapter 3: Interface and API Design 73

Item 15: Use Prefix Names to Avoid Namespace Clashes 73

Item 16: Have a Designated Initializer 78

Item 17: Implement the description Method 84

Item 18: Prefer Immutable Objects 89

Item 19: Use Clear and Consistent Naming 95

Item 20: Prefix Private Method Names 102

Item 21: Understand the Objective-C Error Model 104

Item 22: Understand the NSCopying Protocol 109

Chapter 4: Protocols and Categories 115

Item 23: Use Delegate and Data Source Protocols for Interobject Communication 115

Item 24: Use Categories to Break Class Implementations into Manageable Segments 123

Item 25: Always Prefix Category Names on Third-Party Classes 127

Item 26: Avoid Properties in Categories 130

Item 27: Use the Class-Continuation Category to Hide Implementation Detail 133

Item 28: Use a Protocol to Provide Anonymous Objects 140

Chapter 5: Memory Management 145

Item 29: Understand Reference Counting 145

Item 30: Use ARC to Make Reference Counting Easier 153

Item 31: Release References and Clean Up Observation State Only in dealloc 162

Item 32: Beware of Memory Management with Exception-Safe Code 165

Item 33: Use Weak References to Avoid Retain Cycles 168

Item 34: Use Autorelease Pool Blocks to Reduce High-Memory Waterline 173

Item 35: Use Zombies to Help Debug Memory-Management Problems 177

Item 36: Avoid Using retainCount 183

Chapter 6: Blocks and Grand Central Dispatch 187

Item 37: Understand Blocks 188

Item 38: Create typedefs for Common Block Types 194

Item 39: Use Handler Blocks to Reduce Code Separation 197

Item 40: Avoid Retain Cycles Introduced by Blocks Referencing the Object Owning Them 203

Item 41: Prefer Dispatch Queues to Locks for Synchronization 208

Item 42: Prefer GCD to performSelector and Friends 213

Item 43: Know When to Use GCD and When to Use Operation Queues 217

Item 44: Use Dispatch Groups to Take Advantage of Platform Scaling 220

Item 45: Use dispatch_once for Thread-Safe Single-Time Code Execution 225

Item 46: Avoid dispatch_get_current_queue 226

Chapter 7: The System Frameworks 233

Item 47: Familiarize Yourself with the System Frameworks 233

Item 48: Prefer Block Enumeration to for Loops 236

Item 49: Use Toll-Free Bridging for Collections with Custom Memory-Management Semantics 243

Item 50: Use NSCache Instead of NSDictionary for Caches 248

Item 51: Keep initialize and load Implementations Lean 252

Item 52: Remember that NSTimer Retains Its Target 258

Index 265

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