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- (void) draw { NSLog (@"drawing a circle at (%d %d %d %d) in %@", bounds.x, bounds.y, bounds.width, bounds.height, colorName(fillColor)); } // draw @end // Circle

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#import "QuickStartViewControllerh" @implementation QuickStartViewController @synthesize myLabel; -(IBAction) sayHello: (id) sender { NSLog(@"Hello"); selfmyLabeltext = @"Hello"; } -(void) dealloc { [super dealloc]; [myLabel release]; } @end

Now we ll examine the code in detail, in our customary fashion. The implementation for Circle starts out with this line:

(continued)

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@implementation Circle @implementation is a compiler directive that says you re about to present the code for the

14 Select Product | Build QuickStart from Xcode s main menu to build the application 15 Click QuickStartViewControllerxib in the Resources folder to display the Interface Builder

to show the object s connections (Figure 1-14)

guts of a class. The name of the class appears after @implementation. There is no trailing semicolon on this line, because you don t need semicolons after Objective-C compiler directives. The definitions of the individual methods are next. They don t have to appear in the same order as they do in the @interface directive. You can even define methods in an @implementation that don t have a corresponding declaration in the @interface. You can think of these as private methods, used just in the implementation of the class.

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Figure 1-14

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You might think that defining a method solely in the @implementation directive makes it inaccessible from outside the implementation, but that s not the case. Objective-C doesn t really have private methods. There is no way to mark a method as being private and preventing other code from calling it. This is a side effect of Objective-C s dynamic nature.

1:

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ssetFillColor: is the first method defined: - (void) setFillColor: (ShapeColor) c { fillColor = c; } // setFillColor

The iOS Software Development Kit (SDK)

Owner in the document window and release Select sayHello: from the pop-up window (Figure 1-15)

The first line of the definition of setFillColor: looks a lot like the declaration in the @interface section. The main difference is that this one doesn t have a semicolon at the end. You may notice that we renamed the parameter to simply c. It s OK for the parameter names to differ between the @interface and the @implementation. In this case, if we had left the parameter name as fillColor, it would have hidden the fillColor instance variable and generated a warning from the compiler.

15 1626

Click the circle next to New Referencing Outlet, and drag and drop on the File s Owner (Figure 1-16) Select myLabel from the pop-up window Be careful not to select View

Why exactly do we have to rename fillColor We already have an instance variable named fillColor defined by the class. We can refer to that variable in this method it s in scope. So, if we define another variable with the same name, the compiler will cut off our access from the instance variable. Using the same variable name hides the original variable. We avoid this problem by using a new name for the parameter. We could have named the instance variable something else, like myFillColor, and then we could have kept fillColor as the parameter name. As you ll see later in 16, Cocoa can do some magic if we name our instance variable similar to how we name our methods.

Figure 1-15

In the @interface section, we used the name fillColor in the method declaration because it tells the reader exactly what the argument is for. In the implementation, we have to distinguish between the parameter name and the instance variable name, and it s easiest to simply rename the parameter. The body of the method is one line:

(continued)

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Figure 1-16

fillColor = c;

19 Select File | Save from the main menu to save your interface changes 20 In Xcode, ensure the Active SDK shows the iPhone Simulator option selected

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