Browse Library
Sign In Start Free Trial
Close icon Search icon
Account
Browse Library Advanced Search Sign In Start Free Trial

Add to playlist

Create a Playlist

Modal Close icon
You need to login to use this feature.
  • Book Overview & Buying Objective C Memory Management Essentials
  • Table Of Contents Toc
  • Feedback & Rating feedback
Objective C Memory Management Essentials

Objective C Memory Management Essentials

By : Tang
3.3 (3)
Buy this Book
close
close
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)
close
close
close
Preface
Icon
Preface
Icon
What this book covers
Icon
What you need for this book
Icon
Who this book is for
Icon
Conventions
Icon
Reader feedback
Icon
Customer support
Free Chapter
1
1. Introduction to Objective-C Memory Management
Icon
1. Introduction to Objective-C Memory Management
Icon
Why do we need memory management in Objective-C?
Icon
An object's ownership and life cycle
Icon
Ownership of object and reference counting
Icon
What's a memory leak and why pay attention to it?
Icon
What is an object within Objective-C?
Icon
Summary
2
2. Automatic Reference Counting
Icon
2. Automatic Reference Counting
Icon
What is ARC and how does it work?
Icon
How ARC looks
Icon
Project settings for ARC
Icon
A memory model in Objective-C
Icon
What you need to know about ARC and weak references
Icon
Summary
3
3. Using Autorelease Pools
chevron up
Icon
3. Using Autorelease Pools
Icon
Understanding the autorelease pool mechanism
Icon
Autorelease pool mechanism
Icon
An overview of Apple autoreleased classes
Icon
ARC and autorelease
Icon
Autorelease pool blocks and threads
Icon
Summary
4
4. Object Creation and Storage
Icon
4. Object Creation and Storage
Icon
Creation and initialization of objects
Icon
What is a class?
Icon
Object immutability
Icon
Object mutability
Icon
Inheritance
Icon
Convenience initializers
Icon
An Objective-C programmer's responsibility
Icon
The singleton pattern
Icon
Creating @property
Icon
Creating custom methods
Icon
String formatting
Icon
Summary
5
5. Managing Your Application Data
Icon
5. Managing Your Application Data
Icon
Device memory
Icon
Caching
Icon
SQLite
Icon
Summary
6
6. Using Core Data for Persistence
Icon
6. Using Core Data for Persistence
Icon
Why use Core Data?
Icon
Understanding Core Data concepts
Icon
Putting it into practice
Icon
Getting into the code
Icon
Saving data into the persistent store
Icon
Deleting data from the persistent store
Icon
Updating data
Icon
Summary
7
7. Key-value Programming Approaches
Icon
7. Key-value Programming Approaches
Icon
What is key-value coding or KVC?
Icon
The NSKeyValueCoding protocol
Icon
Manual subsets of NSKeyValueCoding behavior
Icon
Associated objects
Icon
Selectors as keys
Icon
Maximum flexibility and handling unusual keys/values
Icon
Key-value observing
Icon
Summary
8
8. Introduction to Swift
Icon
8. Introduction to Swift
Icon
Welcome to Swift
Icon
Basics of Swift
Icon
Memory management in Swift
Icon
Summary
9
9. Memory Management and Debugging
Icon
9. Memory Management and Debugging
Icon
Memory leaks
Icon
Using the debugger and breakpoints
Icon
Collecting data on your app
Icon
Plumbing memory leaks
Icon
Using the LLVM / Clang Static Analyzer
Icon
Summary
10
10. Tips and Tricks for Memory Management
Icon
10. Tips and Tricks for Memory Management
Icon
Objective-C, C, and memory management
Icon
Getters and setters
Icon
The property attribute in Objective-C
Icon
Performance guidelines
Icon
Don't overthink about memory management
Icon
When to avoid KVC and KVO
Icon
Summary
11
11. Features of Xcode 6
Icon
11. Features of Xcode 6
Icon
Introducing Xcode 6
Icon
What's new in storyboard
Icon
Debugging in Xcode 6
Icon
What's new in Interface Builder
Icon
Playground for Swift
Icon
Summary
12
Index
Icon
Index

ARC and autorelease

ARC does still use autorelease as a mechanism, but besides that, its compiled code is created to interoperate with no problem with MRC compiled code, thus autorelease is present.

Despite the fact that ARC does a good job handling the memory management for us, there is still a situation when you need to use autorelease. Sometimes, we create a large number of temporary objects and many of them are only used once. In this case, you might want to free up the memory used by them.

In order to dealloc those objects into the autorelease pool instead of waiting for them to be freed naturally, check out the following code sample in a non-ARC environment:

/*
  -------------------------------------------------------
  Non-ARC Environment with Memory Leaks
*/
@autoreleasepool 
{
  // No autorelease call here
   MyObject *obj = [[MyObject alloc] init];

   /* Since MyObject is never released its
     a leak even when the pool exits
  */
}

  /*
  ------------------------------------...

Unlock full access

Continue reading for free

A Packt free trial gives you instant online access to our library of over 7000 practical eBooks and videos, constantly updated with the latest in tech
Start a 7-day FREE trial
End of Section 5
Next Section

Create a Note

Modal Close icon
You need to login to use this feature.
notes
bookmark search playlist font-size

Change the font size

margin-width

Change margin width

day-mode

Change background colour

Close icon Search
Country selected
Close icon Your notes and bookmarks

Delete Bookmark

Modal Close icon
Are you sure you want to delete it?
Cancel
Yes, Delete

Delete Note

Modal Close icon
Are you sure you want to delete it?
Cancel
Yes, Delete

Edit Note

Modal Close icon
Write a note (max 255 characters)
Cancel
Update Note

Confirmation

Modal Close icon
claim successful
Order Page Read Now

Buy this book with your credits?

Modal Close icon
Are you sure you want to buy this book with one of your credits?
Close
YES, BUY