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Objective C Memory Management Essentials

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Objective C Memory Management Essentials

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Objective C Memory Management Essentials
Mar, 2015 | 200 pages
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Table of Contents (18 chapters)
Objective-C Memory Management Essentials
Objective-C Memory Management Essentials
Credits
Credits
About the Authors
About the Authors
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Introduction to Objective-C Memory Management
Introduction to Objective-C Memory Management
Why do we need memory management in Objective-C?
An object's ownership and life cycle
Ownership of object and reference counting
What's a memory leak and why pay attention to it?
What is an object within Objective-C?
Summary
2
Automatic Reference Counting
Automatic Reference Counting
What is ARC and how does it work?
How ARC looks
Project settings for ARC
A memory model in Objective-C
What you need to know about ARC and weak references
Summary
3
Using Autorelease Pools
Using Autorelease Pools
Understanding the autorelease pool mechanism
Autorelease pool mechanism
An overview of Apple autoreleased classes
ARC and autorelease
Autorelease pool blocks and threads
Summary
4
Object Creation and Storage
Object Creation and Storage
Creation and initialization of objects
What is a class?
Object immutability
Object mutability
Inheritance
Convenience initializers
An Objective-C programmer's responsibility
The singleton pattern
Creating @property
Creating custom methods
String formatting
Summary
5
Managing Your Application Data
Managing Your Application Data
Device memory
Caching
SQLite
Summary
6
Using Core Data for Persistence
Using Core Data for Persistence
Why use Core Data?
Understanding Core Data concepts
Putting it into practice
Getting into the code
Saving data into the persistent store
Deleting data from the persistent store
Updating data
Summary
7
Key-value Programming Approaches
Key-value Programming Approaches
What is key-value coding or KVC?
The NSKeyValueCoding protocol
Manual subsets of NSKeyValueCoding behavior
Associated objects
Selectors as keys
Maximum flexibility and handling unusual keys/values
Key-value observing
Summary
8
Introduction to Swift
Introduction to Swift
Welcome to Swift
Basics of Swift
Memory management in Swift
Summary
9
Memory Management and Debugging
Memory Management and Debugging
Memory leaks
Using the debugger and breakpoints
Collecting data on your app
Plumbing memory leaks
Using the LLVM / Clang Static Analyzer
Summary
10
Tips and Tricks for Memory Management
Tips and Tricks for Memory Management
Objective-C, C, and memory management
Getters and setters
The property attribute in Objective-C
Performance guidelines
Don't overthink about memory management
When to avoid KVC and KVO
Summary
11
Features of Xcode 6
Features of Xcode 6
Introducing Xcode 6
What's new in storyboard
Debugging in Xcode 6
What's new in Interface Builder
Playground for Swift
Summary
Index
Index

Chapter 2. Automatic Reference Counting

Good ideas live a long life and bad ones die fast. In Objective-C, reference counting's long life was seen as a very good idea. The next step of evolution in this is that it became automatic, so we call it Automatic Reference Counting (ARC), which was introduced by Apple Inc. in 2011 for application development on its desktop and mobile OS, Mac OS X Lion, and iOS 5. It changed the name of the initial referencing counting to Manual Reference Counting.

We will cover the following topics in this chapter:

  • ARC and how it works

  • Advantages and disadvantages of ARC

  • Project settings for ARC

  • Mixing code that doesn't support ARC with your project

  • Memory model in Objective C

  • ARC in UI kit

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