Objective C Memory Management Essentials

335 Pages·2015·4.529 MB·English-3

by  Gibson Tang

Objective-C Memory Management
Essentials
Table of Contents
Objective-C Memory Management Essentials
Credits
About the Authors
About the Reviewers
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Preface
What this book covers
What you need for this book
Who this book is for
Conventions
Reader feedback
Customer support
Downloading the example code
Errata
Piracy
Questions
1. 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
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
Understanding the autorelease pool mechanism
Autorelease pool mechanism
Reducing peak memory footprint with autorelease pool blocks
An overview of Apple autoreleased classes
NSRunLoop
NSException
ARC and autorelease
Autorelease pool blocks and threads
Summary
4. Object Creation and Storage
Creation and initialization of objects
What is a class?
Classes
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
Device memory
Image optimization
Lazy loading
Control creation
Caching
SDWebImage
Object serialization
SQLite
SQLite versus Core Data
Summary
6. 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
What is key-value coding or KVC?
The NSKeyValueCoding protocol
Compliance of attributes and one-to-one relationships
Compliance of indexed one-to-many relationships
Compliance of unordered many-to-many relationships
Advantages of key-value coding
Disadvantages of key-value coding
Manual subsets of NSKeyValueCoding behavior
Advantages of creating your own lookup path
Disadvantages of creating your own lookup path
Associated objects
Advantages of using associated objects
Disadvantages of using associated objects
Selectors as keys
Advantages of using selectors as keys
Disadvantages of using selectors as keys
Maximum flexibility and handling unusual keys/values
Advantages of doing your own implementation
Disadvantages of doing your own implementation
Key-value observing
Implementing key-value observing
Performance considerations
Summary
8. Introduction to Swift
Welcome to Swift
Basics of Swift
Variable declaration
Iterating statements
Conditional statements
Functions
Classes and structures in Swift
Closures
Memory management in Swift
Summary
9. Memory Management and Debugging
Memory leaks
Strong/weak references
Retain cycles
Memory overuse
Using the debugger and breakpoints
Collecting data on your app
Plumbing memory leaks
Using the LLVM / Clang Static Analyzer
Using NSZombie
Summary
10. 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
Introducing Xcode 6
What’s new in storyboard
Allowing storyboard or the NIB file to replace launch images
Launching images from your app
Universal storyboards
Debugging in Xcode 6
Debug gauges
What’s new in Interface Builder
Playground for Swift
Summary
Index

Objective-C Memory Management
Essentials