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If you re using properties, and you get strange error messages about accessing something that is not a struct, make sure you ve included all the necessary header files for the classes you re using. That s pretty much it for the new stuff that properties introduce. Of course, we have some additional cases to discuss for the proper handling of object attributes and for avoiding the exposure of both setters and getters. Let s talk about those next.

1 Reopen DogBreeds in Xcode If you have the DogBreeds-Final project downloaded,

.

you might want to also open it so that you can easily refer to the final project if you are uncertain how to complete a step

So far we ve looked at properties for scalar types float in particular, but the same techniques apply for int, char, BOOL, and struct. For example, you can have an NSRect property if you want. Objects bring some added complications. Recall that we retain and release objects as they flow through our accessors. For some object values, particularly string values, you want to always -copy them. Yet for other object values, like delegates (which we ll talk about in the next chapter), you don t want to retain them at all.

(select the check boxes for a subclass of UITableViewController and create a xib file) Call it BreedsListViewController

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Whoa, wait a minute. What s with that copying and not retaining You want to make copies of string arguments. A common error is to get a string from the user interface, like a text field, and use that as something s name. The strings you get from text fields are typically mutable strings and will change when the user types something new. Making a copy of the string prevents the value from changing unexpectedly. Now, what about not retaining objects There is a special case, called a retain cycle, in which reference counting breaks down. If you have an owner/owned relationship, as between Car and Engine, you want the car to retain (own) the engine but not the other way around. The engine should not retain the car it has been installed in. If the car retains the engine, and the engine retains the car, then neither reference count will go to zero, and neither will ever be cleaned up. Car s dealloc won t get called until the engine releases the car in its dealloc, and the engine s dealloc won t get called until car s dealloc releases the Engine. They just sit there, staring at each other, waiting for the other to blink. The general rule is that the owner object retains the ownee object, and not the other way around. Lucky garbage collection users don t need to worry about this case.

IBOutlets for sub-views to edit a breed and display breed details Also add properties for the fetchedResultsController and managedObjectStore like RootViewController The class will also have to implement the NSFetchedResultsControllerDelegate protocol (Listing 17-12) Listing 17-12 BreedsListViewControllerh

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