Learning the iOS 4 SDK for JavaScript Programmers

Integrating the DGCar Class into Workbench

After you have entered the customized code into the DGCar header and method files, it’s time to integrate the class into Workbench and see it in action. The class has already been added to the Workbench project (when Xcode created the files), so click the WorkbenchViewController.m file to add code to the runMyCode: method that is to act with the DGCar class when you click the button in the simulator.

The first task is to add an import directive to the WorkbenchViewController implementation. You can put it above or below the existing #import statement, because neither depends on the other:

#import "WorkbenchViewController.h"
#import "DGCar.h"

The only changes to the rest of the implementation file are inside the runMyCode: method. Replace the original NSLog() function with four new statements:

- (IBAction)runMyCode:(id)sender {
    DGCar *myCar1 = [[DGCar alloc] initWithCarMake:@"Chevrolet"
                                             model:@"Malibu" year:@"2007"];
    DGCar *myCar2 = [[DGCar alloc] initWithCarMake:@"Ford"
                                             model:@"Taurus" year:@"2010"];

    NSLog(@"I used to drive a:%@", [myCar1 getFormattedListing]);
    NSLog(@"I now drive a:%@", [myCar2 getFormattedListing]);
}

Warning

This method also needs some memory management, but I’ll reserve that discussion until Chapter 6.

Now that you have a little more experience with Objective-C methods, I can address finer details of the runMyCode: method, which you added to the project in Chapter 3. This method, you’ll recall, runs in response to the Touch ...