Sams Teach Yourself Objective-C in 24 Hours > Hour 16. Managing Memory and Runtime Objects > Q&A

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Sams Teach Yourself Objective-C in 24 Hours

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Introduction

Part I. Getting Started with Objective-C

Part II. Working with the Objective-C Basics

Hour 6. Exploring Messaging and a Testbed App

Hour 7. Declaring a Class in an Interface File

Hour 8. Declaring Instance Variables in an Interface File

Hour 9. Declaring Properties in an Interface File

Hour 10. Declaring Methods in an Interface File

Hour 11. Declaring Actions in an Interface File

Hour 12. Routing Messages with Selectors

Hour 13. Building on the Foundation

Hour 14. Defining a Class in an Implementation File

Hour 15. Organizing Data with Collections

Hour 16. Managing Memory and Runtime Objects

Managing Objects in Memory

Managing Reference Counts Manually

Managing Reference Counts with ARC

Variable Qualifiers

Autoreleasing Variables

Summary

Q&A

Workshop

Part III. Expanding and Extending Classes

Part IV. Beyond the Basics

Part V. Appendixes

Index

Q&A

Q. What are the most common problems that result from manual reference counting?

A. Memory leaks and app crashes. Be thankful for ARC!

Q. Why should you think twice about converting existing code to ARC?

A. Because constructs such as retain, release, and dealloc are not allowed under ARC, you may break existing code.

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