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Objective C Memory Management Essentials 无水印pdf.pdf

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    Cover
    Copyright
    Credits
    About the Authors
    About the Reviewers
    www.PacktPub.com
    Table of Contents
    Preface
    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
    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
    www.it-ebooks.info
    Objective-C Memory Management Essentials Learn and put into practice various memory management techniques in Objective-C to create robust iOS applications Gibson Tang Maxim Vasilkov BIRMINGHAM - MUMBAI
    Objective-C Memory Management Essentials Copyright © 2015 Packt Publishing All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews. Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the authors, nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book. Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information. First published: March 2015 Production reference: 1190315 Published by Packt Publishing Ltd. Livery Place 35 Livery Street Birmingham B3 2PB, UK. ISBN 978-1-84969-712-5 www.packtpub.com www.it-ebooks.info
    Credits Project Coordinator Leena Purkait Proofreaders Simran Bhogal Maria Gould Indexer Hemangini Bari Graphics Sheetal Aute Production Coordinator Melwyn D'sa Cover Work Melwyn D'sa Authors Gibson Tang Maxim Vasilkov Reviewers Emil Atanasov Christine M. Gerpheide Commissioning Editor James Jones Acquisition Editor James Jones Content Development Editor Amey Varangaonkar Technical Editor Vijin Boricha Copy Editor Janbal Dharmaraj www.it-ebooks.info
    About the Authors Gibson Tang grew up loving technology after getting his hands on an old Apple II when he was still a young kid. Since then, he has never stopped keeping pace with technology, and after he coded his first "Hello World" program, he has been hooked on programming ever since. Following his studies at Nanyang Polytechnic and Singapore Institute of Management and serving a 6-year stint in the Republic of Singapore Navy (RSN), he honed his development skills creating software and games for Yahoo! and other Fortune 500 companies. In 2010, he founded Azukisoft Pte Ltd in Singapore to focus on mobile application development. Since then, he has developed countless mobile applications and games for start-ups and big companies both in USA and Singapore. Apart from programming, he indulges in various hobbies such as soccer, computer games, and jogging in order to get his regular dose of Vitamin D and to see the sun once in a while. Occasionally, he would be on Steam or Battle.net blowing off some steam by slaying monsters and killer robots after a day of programming. I would like to thank the many people who have contributed to my knowledge of programming over the years. Some honorable mentions go out to the geeks and nerds of Hackerspace.sg as they have kept me in stitches with their geek jokes and anime. Next, a great thank you goes to Mugunth Kumar, who is an overflowing fountain of knowledge of all things related to Objective-C. Also, thanks to Subhransu Behera, the organizer of the iOS Dev Scout meetup group in Singapore and finally, to my colleagues at Azukisoft Pte Ltd, namely Igor and Dimitry, who have never failed to amaze me with all their new knowledge and things they have learned over the course of their work with me. www.it-ebooks.info
    Maxim Vasilkov is a mobile software developer in Azukisoft Pte Ltd. He started programming over 10 years ago. He started with iOS when the SDK was made publicly available, and from that time onwards, he developed a passion for making mobile apps. He is also experienced with other programming languages and has expertise working with various team sizes, which gave him the opportunity to look at different approaches to programming. Outside of work, he is a proud father of beautiful triplets, Anna, Maria, and Victoria, who are now 4 years old. This has helped him try out mobile games for kids and enables him to be an expert in mobile games for kids. I would like to dedicate this chapter to my lovely wife, Irina, and my three princesses, Anna, Maria, and Victoria. Last but not least, I'd like to thank my colleagues at Azukisoft Pte Ltd and Gibson Tang for giving me an opportunity to work on a lot of challenging projects. www.it-ebooks.info
    About the Reviewers Emil Atanasov is an IT consultant who has strong experience with mobile technologies. He is doing his MSc at RWTH Aachen University, Germany. He has worked for several huge USA companies and has been a freelancer for years. He has experience in software design and development, and personally, he has worked on the improvement of many mobile apps. At the moment, he is focused on the rapidly developing mobile sector. As an Android team leader and senior developer, Emil was leading a team that was developing a part of the Nook Color firmware. This was an e-magazine/e-book reader, which supports the proprietary Barnes & Nobel and many other e-book formats. Many of the apps that Emil has designed are using Flurry API to track different users' statistics. Based on this experience, he is one of the people behind the Getting Started with Flurry Analytics book. I want to thank my family and friends for being so cool. Thank you for supporting me even though I'm such a bizarre person, who is investing so much of his time in the computer world. Thank you, guys! Christine M. Gerpheide is a software development engineer at Amazon Web Services. She completed her master's in computer science and engineering with honors from Eindhoven University of Technology in the Netherlands, before which she worked in Greece as a web developer. During her career, Christine has worked on a wide range of software, including service-oriented architectures, model-driven engineering, and mobile development. During her free time, she hikes, runs, and plays violin. Other books reviewed by Christine include TYPO3 Templates by Packt Publishing, and she has presented at a number of scientific and open source conferences. www.it-ebooks.info
    www.PacktPub.com Support files, eBooks, discount offers, and more For support files and downloads related to your book, please visit www.PacktPub.com. Did you know that Packt offers eBook versions of every book published, with PDF and ePub files available? You can upgrade to the eBook version at www.PacktPub.com and as a print book customer, you are entitled to a discount on the eBook copy. Get in touch with us at service@packtpub.com for more details. At www.PacktPub.com, you can also read a collection of free technical articles, sign up for a range of free newsletters and receive exclusive discounts and offers on Packt books and eBooks. TM https://www2.packtpub.com/books/subscription/packtlib Do you need instant solutions to your IT questions? PacktLib is Packt's online digital book library. Here, you can search, access, and read Packt's entire library of books. Why subscribe? • Fully searchable across every book published by Packt • Copy and paste, print, and bookmark content • On demand and accessible via a web browser Free access for Packt account holders If you have an account with Packt at www.PacktPub.com, you can use this to access PacktLib today and view 9 entirely free books. Simply use your login credentials for immediate access. www.it-ebooks.info
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