Advances in Computers, Vol. 28 by Marshall C. Yovits

By Marshall C. Yovits

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Once you get the hang of the Smalltalk-style syntax, if you’ve programmed in an object-oriented language before, things should look fairly familiar. However, there are some differences, and I discuss them in this chapter. One of the bigger differences, especially for those who are coming from a Java background, is in how Objective-C deals with memory management. Declaring and Defining Classes As is the case in almost all other object-oriented languages, in Objective-C classes provide the building blocks to allow encapsulation of data and methods that act on that data.

H> @interface HelloWorldViewController : UIViewController { } @end However, looking at the header file you’ll see that our HelloWorldViewController class is a subclass of the UIViewController class. This is the class that provides the fundamental view-management model for iPhone applications, and this class is associated in Interface Builder with a NIB file (when you create a view-based project, Xcode automatically creates the associated NIB file). That NIB file contains the UI that will be displayed when we make this view visible.

In other words, if a class defines a variable foo, the value of foo can be different for objects for the same class. Changing the value of an instance variable in one object will not affect the value of the same variable in all the other objects of that class. Conversely, only a single copy of a class variable exists. If you change the value of a class variable from one object, the value of that variable will change for all the objects of that class. Accessor methods Accessor methods, sometimes called getters and setters, are usually fairly simple methods used to get and set instance variables in a class.

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