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iOS Application Programming Guide
General

2010-11-15

Apple Inc. © 2010 Apple Inc. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, mechanical, electronic, photocopying, recording, or otherwise, without prior written permission of Apple Inc., with the following exceptions: Any person is herebyauthorized to store documentation on a single computer for personal use only and to print copies of documentation for personal use provided that the documentation contains Apple’s copyright notice. The Apple logo is a trademark of Apple Inc. Use of the “keyboard” Apple logo (Option-Shift-K) for commercial purposes without the prior written consent of Apple may constitute trademark infringement andunfair competition in violation of federal and state laws. No licenses, express or implied, are granted with respect to any of the technology described in this document. Apple retains all intellectual property rights associated with the technology described in this document. This document is intended to assist application developers to develop applications only for Apple-labeled computers. Everyeffort has been made to ensure that the information in this document is accurate. Apple is not responsible for typographical errors. Apple Inc. 1 Infinite Loop Cupertino, CA 95014 408-996-1010 App Store is a service mark of Apple Inc. Apple, the Apple logo, Bonjour, Cocoa, Instruments, iPhone, iPod, iPod touch, iTunes, Keychain, Mac, Mac OS, Macintosh, Objective-C, Safari, Sand, and Xcode aretrademarks of Apple Inc., registered in the United States and other countries. iPad and Retina are trademarks of Apple Inc. IOS is a trademark or registered trademark of Cisco in the U.S. and other countries and is used under license. Intel and Intel Core are registered trademarks of Intel Corportation or its subsidiaries in the United States and other countries.

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Contents
Introduction

About iOS Application Design 9
Understanding the iOS Runtime Environment 10 Designing the Core of Your Application 10 Supporting Common Application Behaviors 10 Executing Code in the Background 10 Meeting the App Store and SystemRequirements 11 Tuning Performance for the Underlying Device 11 See Also 11

Chapter 1

The Application Runtime Environment 13
Fast Launch, Short Use 13 Specialized System Behaviors 13 The Virtual Memory System 13 The Automatic Sleep Timer 14 Multitasking Support 14 Security 14 The Application Sandbox 14 File Protection 15 Keychain Data 16 The File System 16 A Few Important Application...
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