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The sample DogBreeds application for this chapter included editing functionality so that we could illustrate adding, deleting, and updating objects stored using Core Data In a typical reference application you probably wouldn t include any editing functionality and the database could be read-only If that is the case, then you could avoid copying the database to the Documents directory and just open it in the Resources directory (which is read-only) If you downloaded the DogBreeds-Final project in the sample code for this chapter, you ll see that it includes a default database with some of the dog breeds in the herding group already entered for you We ll start with that project in 19 and turn it into a universal application for the iPad, so having some data already present will make it much more interesting on the iPad s large screen
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You now have a complete and somewhat useful iOS application In the preceding section you even learned how to distribute your application with predefined information It should be fairly easy to repurpose the sample code from this chapter for different reference material by simply changing the data model to have the appropriate entities, attributes, and relationships and then changing the various views to display those attributes So, what remains to be done before you can proudly submit your reference application to the App Store and start making money There are several rough edges in our sample application that you would want to polish in order to have a quality application, but none of them are difficult The first thing that you might do is remove the editing functionality from the application and build a separate Mac OS X application (using the same data model) for entering and editing your reference material If it s reference material, you probably don t want your customers changing it anyway That would also free up the right button location in the navigation bar for an information icon button At the RootViewController level that button could display a screen of general information about your application, data sources, etc At the BreedsListViewController level it could display the description of the breed, since we re currently only displaying the first line of it in the table view When tapping on the various breeds in the Herding Group in the DogBreeds-Final application, you probably noticed a delay between when you tapped and when the detailed view appeared The viewWillAppear method loads the photo data synchronously from the Internet, which means the user waits while a potentially large photo downloads Ideally, the application should have immediately displayed the detail view and then loaded the photo data asynchronously with some indication that the photo was loading Even better would be to make your reference application self-contained When they create a new breed, you could retrieve the photo from the URL and store the actual photo data in the database Then when the user taps on a breed you can display the detail view quickly and it will work whether the user has Internet access or not There are also many ways that you could make the application prettier For instance, the UITableView that displays the list of breeds within an AKC group could use custom table cells that display a thumbnail photo of the breed alongside its name
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In this chapter, you learned the basics of Core Data framework After learning how to model your application s data objects, you learned how to insert, fetch, and delete instances from the data model But you only scratched Core Data s surface in this chapter There are so many ways to create an NSPredicate, so many ways to create an NSFetchRequest, and so many variations on the different ways of working with the managed object context that covering them all would result in a several-hundred-page book To continue learning more about Core Data, refer to Apple s documentation Apple has heavily documented the Core Data framework The first reference you should consult is Apple s Core Data Tutorial for iOS Consult Apple s Creating a Managed Object Model with Xcode tutorial and also Xcode Tools for Core Data for more information on using Xcode s data modeler Consult Apple s Predicate Programming Guide for more information on writing predicates Finally, for a complete reference on Core Data, consult Apple s Core Data Programming Guide
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