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As we ve mentioned before, Cocoa doesn t have any truly private methods. If you know the name of a method an object supports, you can call it, even if there is no declaration for that method in a class s @interface. The compiler, though, tries to be helpful. If it sees you calling a method on an object, and it hasn t seen a declaration or definition for that method yet, it complains like this: warning: 'CategoryThing' may not respond to '-setThing4:'. Generally, this kind of complaint is good, because it will help you catch a lot of your typos. But the compiler s vigilance can cause problems if you have methods that your implementation uses that aren t listed in the @interface section of your class. There are a lot of good reasons why you don t want to list all your methods there. The methods might be pure implementation details, or you might be playing around with method names to decide which ones you want to use. But if you don t declare your methods before using them, you ll get warnings from the compiler. Fixing all compiler warnings is a good thing, so what can you do If you can arrange to define a method before you use it, the compiler will see your definition, and it won t produce a warning. But if that s not convenient to do, or if you re using a nonpublished method in another class, you ll need to do something else.

Listing 17-14

- (void)insertNewBreed { NSManagedObjectContext *context = [selffetchedResultsController managedObjectContext]; Breed *newBreed = [NSEntityDescription insertNewObjectForEntityForName: @"Breed" inManagedObjectContext:context]; [newBreed setValue:@"" forKey:@"name"]; [newBreed setValue:@"" forKey:@"breedDescription"]; [newBreed setValue:@"" forKey:@"photoURL"]; [selfselectedGroup addBreedsObject:newBreed]; NSError *error = nil; if (![context save:&error]) { NSLog(@"Unresolved error %@, %@", error, [error userInfo]); abort(); } selfbreedEditorVCbreed = newBreed; selfbreedEditorVCinsertingBreed = YES; selfbreedEditorVCselectedGroup = selfselectedGroup; [selfnavigationController pushViewController:selfbreedEditorVC animated:YES]; }

Categories to the Rescue!

12

URL Add a label and text view for the description Connect the fields to the IBOutlets in the File s Owner Save your changes and then switch to BreedsListViewControllerxib, add a view controller and change its class to BreedViewController, set it to load from the BreedViewController nib, and connect it to the breedEditorVC IBOutlet

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Declaring a method in a category is enough for the compiler to say, OK, this method exists. I m not going to complain if I see the programmer using it. You don t actually have to implement it if you don t want to. Our technique is often to place a category at the top of the implementation file. Say that Car has a method called rotateTires. We could implement rotateTires in terms of another method called moveTireFromPosition:toPosition: to swap the tires at two locations. This second method is an implementation detail and not something that we want to put into the public interface of the car. By declaring it in a category, rotateTires can use move TireFromPosition:toPosition: without generating any warnings from the compiler. The category would look like this:

groups, move in/out of AKC groups, and add/edit/delete breeds within any group (Figure 17-11) You re getting close to a completed application

@interface Car (PrivateMethods) - (void) moveTireFromPosition: (int) pos1 toPosition: (int) pos2; @end // Private Methods

(continued)

international, regional, and boutique financial services firms An international investment bank has offices around the globe and provides services that include sales and trading of international securities, research on publicly traded debt and equity, advising municipalities and underwriting municipal bonds, raising capital for corporations, and advising on mergers and acquisitions Many large investment banks also house private equity operations, carry on arbitrage activities, and make loans A small boutique firm, on the other hand, may have only a handful of employees focused on providing one particular service A number of commercial banks have recently acquired investment banking firms in an attempt to cross-market products and services to the same client base In addition, several large accounting firms currently provide some investment banking service, and others have announced plans to do so in the future

properties and IBOutlets for the breedDescription and photo (Listing 17-15) Save your changes and open BreedDetailViewControllerm and synthesize the properties and release them in the dealloc method Listing 17-15 BreedDetailViewControllerh

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