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  • Book Overview & Buying Objective C Memory Management Essentials
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Objective C Memory Management Essentials

Objective C Memory Management Essentials

By : Tang
3.3 (3)
Buy this Book
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Objective C Memory Management Essentials

Objective C Memory Management Essentials

3.3 (3)
By: Tang
Buy this Book

Overview of this book

If you are new to Objective-C or a veteran in iOS application development, this is the book for you. This book will ensure that you can actively learn the methods and concepts in relation to memory management in a more engaging way. Basic knowledge of iOS development is required for this book.
Table of Contents (13 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
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1
1. Introduction to Objective-C Memory Management
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1. Introduction to Objective-C Memory Management
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Why do we need memory management in Objective-C?
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An object's ownership and life cycle
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Ownership of object and reference counting
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What's a memory leak and why pay attention to it?
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What is an object within Objective-C?
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Summary
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2. Automatic Reference Counting
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2. Automatic Reference Counting
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What is ARC and how does it work?
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How ARC looks
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Project settings for ARC
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A memory model in Objective-C
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What you need to know about ARC and weak references
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Summary
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3. Using Autorelease Pools
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3. Using Autorelease Pools
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Understanding the autorelease pool mechanism
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Autorelease pool mechanism
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An overview of Apple autoreleased classes
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ARC and autorelease
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Autorelease pool blocks and threads
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Summary
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4. Object Creation and Storage
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4. Object Creation and Storage
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Creation and initialization of objects
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What is a class?
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Object immutability
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Object mutability
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Inheritance
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Convenience initializers
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An Objective-C programmer's responsibility
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The singleton pattern
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Creating @property
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Creating custom methods
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String formatting
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Summary
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5. Managing Your Application Data
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5. Managing Your Application Data
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Device memory
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Caching
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SQLite
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Summary
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6. Using Core Data for Persistence
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6. Using Core Data for Persistence
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Why use Core Data?
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Understanding Core Data concepts
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Putting it into practice
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Getting into the code
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Saving data into the persistent store
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Deleting data from the persistent store
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Updating data
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Summary
7
7. Key-value Programming Approaches
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7. Key-value Programming Approaches
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What is key-value coding or KVC?
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The NSKeyValueCoding protocol
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Manual subsets of NSKeyValueCoding behavior
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Associated objects
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Selectors as keys
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Maximum flexibility and handling unusual keys/values
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Key-value observing
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Summary
8
8. Introduction to Swift
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8. Introduction to Swift
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Welcome to Swift
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Basics of Swift
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Memory management in Swift
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Summary
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9. Memory Management and Debugging
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9. Memory Management and Debugging
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Memory leaks
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Using the debugger and breakpoints
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Collecting data on your app
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Plumbing memory leaks
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Using the LLVM / Clang Static Analyzer
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Summary
10
10. Tips and Tricks for Memory Management
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10. Tips and Tricks for Memory Management
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Objective-C, C, and memory management
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Getters and setters
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The property attribute in Objective-C
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Performance guidelines
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Don't overthink about memory management
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When to avoid KVC and KVO
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Summary
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11. Features of Xcode 6
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11. Features of Xcode 6
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Introducing Xcode 6
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What's new in storyboard
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Debugging in Xcode 6
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What's new in Interface Builder
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Playground for Swift
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Summary
12
Index
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Index

What is ARC and how does it work?

If you remember, the idea of reference counting covers the actual deletion of objects from the memory. With reference counting, Objective-C takes care of the actual object destruction. Owner objects are only responsible for releasing their claim of ownership on the object. So, logically the idea that appeared next was to make everything completely automatic as it was done in languages such as Java and C#. This idea was developed in the Garbage collection branch and Automatic Reference Counting.

Garbage collection is only available for Mac OS X, starting with version 10.5. Also, note that iOS applications can't use Garbage collection; since it relies on the power of the device, it will take some time to process, forcing the user to wait the process end, thus producing a bad user experience. It is also deprecated since OS X Version 10.8 is in favor of ARC and is scheduled to be removed in the forthcoming versions of OS X.

ARC is a new and innovative way...

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