Effective Objective-C 2.0: 52 Specific Ways to Improve Your IOS and OS X Programs

Effective Objective-C 2.0: 52 Specific Ways to Improve Your IOS and OS X Programs

Paperback Effective Software Development

By (author) Matt Galloway

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  • Publisher: Addison-Wesley Educational Publishers Inc
  • Format: Paperback | 320 pages
  • Dimensions: 175mm x 229mm x 20mm | 612g
  • Publication date: 26 May 2013
  • Publication City/Country: New Jersey
  • ISBN 10: 0321917014
  • ISBN 13: 9780321917010
  • Sales rank: 177,846

Product description

Write Truly Great iOS and OS X Code with Objective-C 2.0! Effective Objective-C 2.0 will help you harness all of Objective-C's expressive power to write OS X or iOS code that works superbly well in production environments. Using the concise, scenario-driven style pioneered in Scott Meyers' best-selling Effective C++, Matt Galloway brings together 52 Objective-C best practices, tips, shortcuts, and realistic code examples that are available nowhere else. Through real-world examples, Galloway uncovers little-known Objective-C quirks, pitfalls, and intricacies that powerfully impact code behavior and performance. You'll learn how to choose the most efficient and effective way to accomplish key tasks when multiple options exist, and how to write code that's easier to understand, maintain, and improve. Galloway goes far beyond the core language, helping you integrate and leverage key Foundation framework classes and modern system libraries, such as Grand Central Dispatch. Coverage includes * Optimizing interactions and relationships between Objective-C objects* Mastering interface and API design: writing classes that feel "right at home"* Using protocols and categories to write maintainable, bug-resistant code* Avoiding memory leaks that can still occur even with Automatic Reference Counting (ARC)* Writing modular, powerful code with Blocks and Grand Central Dispatch* Leveraging differences between Objective-C protocols and multiple inheritance in other languages* Improving code by more effectively using arrays, dictionaries, and sets* Uncovering surprising power in the Cocoa and Cocoa Touch frameworks

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Author information

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