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Extra resources for Effective Objective-C 2.0 52 Specific Ways to Improve Your iOS and OS X Programs

Sample text

Properties are backed by instance variables, but they provide a neat abstraction. You could write accessors yourself, but in true Objective-C style, accessors follow strict naming patterns. Because of this strict naming, it was possible to introduce a language construct to provide a means of automatically creating accessor methods. This is where the @property syntax comes in. You use properties in the definition of an object interface to provide a standard means of accessing the data encapsulated by an object.

A getter is used to read the variable, and a setter is used to write the variable. 0 release through a feature called properties, which allow the developer to tell the compiler to write accessor methods automatically. This feature introduced a new “dot syntax” to make accessing the data stored by classes less verbose. You have probably used properties already, but you may not know about all the options. Also, you may not be aware of some of the intricacies surrounding properties. Item 6 illustrates the background surrounding the problem solved by properties and points out their key features.

I alluded earlier to the fact that objc_msgSend and friends “jump to” the correct method implementation once it has been looked up. ) The name of the function is not quite like this, but I’ve shown it as a combination of the class and the selector just to illustrate the point. Pointers to functions like this are held in a table within each class, keyed against the selector name. It’s this that the objc_msgSend family of methods looks through to find the implementation to jump to. Note that the prototype is strangely similar to the objc_msgSend function itself.

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