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Apple recommends using the NSError Foundation Framework class rather than NSException for handling expected errors See Apple s Introduction to Error Handling Programming Guide for Cocoa and also Introduction to Exception Programming Topics for Cocoa for more information on both classes You will see instances of NSError and NSException scattered through this book s examples

ever, that s not quite as easy as it sounds. Look at that complex statement on the right side of engineCopy. The message sends are nested three levels deep! The first thing this method does is get the class for self. Then, it sends that class an allocWithZone: message to allocate some memory and create a new object of that class. Finally, the init message is sent to this new object to get it initialized. Let s discuss why we need that complicated nest of messages, especially the [self class] business. Recall that alloc is a class method. allocWithZone: is a class method too, as you can tell by the leading plus sign in its method declaration:

4:

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quently and visibly with the IRS team You can make clear to all parties that the best outcome will occur with greater collaboration and communication, and with more trust You can set the stage and affect the ideals and the practices of all the parties Your unique abilities arise from several sources, including the experience with executive decision making, marshaling resources successfully, setting agendas and the tone and context of important transactions, and bringing out the best in people Just imagine the improved effectiveness and satisfaction that can be achieved from essentially a controversial and adversarial process such as an audit when these characteristics are injected into the process

Summary

+ (id) allocWithZone: (NSZone *) zone;

This chapter covered a lot of topics in not very many pages, so it s okay if you re slightly overwhelmed If you understood half of this chapter s topics, you should do okay for the remainder of the book If you wish, you might consider reading Apple s Object-Oriented Programming with Objective-C, available from the iOS Developer s site It s terse and provides a good introduction to object-oriented programming concepts using Objective-C Because you already know Objective-C s basic principles, understanding that document should prove easier Also, although produced by a different publisher, we also recommend the book Programming in Objective-C 20 by Stephen G Kochan (Addison-Wesley Professional, 2009) This book is clear, concise, and will teach you everything you could ever want to know about Objective-C However, these two chapters should provide you with everything you need to know so that you can understand the remainder of this book and get started with your own iOS apps James also has a separate Objective-C book entitled Objective-C for iPhone Programmers: A Beginner s Guide (McGraw-Hill, 2010) For now, continue reading this book and then before pursuing advanced iOS topics, consider quickly working through a specific Objective-C book or at least keeping one handy for reference Objective-C is not hard once you get past the different syntax If you understand properties, protocols, and releasing instance variables in the dealloc method and also Objective-C s basic syntax, then you should feel comfortable moving to the next chapter If you have a basic understanding, trust us when we say that, by this book s end, Objective-C s syntax will seem natural

We ll need to send this message to a class, rather than an instance. What class do we send it to Our first instinct is to send allocWithZone: to Engine, like this:

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