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The other three view controllers work much like ABPeoplePickerNavigationController, with one notable difference: they must each be built on top of a navigation controller. Technically, they re probably not modal view controllers, because they go inside a navigation controller, but you can treat the navigation controller as a modal view controller once everything is loaded up, as you ll see in the example. The ABNewPersonViewController allows a user to enter a new contact. You can prefill some of the info by recording it in an ABRecordRef and setting the displayedPerson property, but this is purely optional (and probably won t usually be done). After you ve created the controller, you need to respond to a method that tells you when the user has entered a new contact. You don t have to do anything with it except dismiss the modal controller, because the controller automatically saves the new contact to the Address Book. You can see what info the user entered, though, and do something with it if you want. Listing 9.7 shows how to deploy a new person view on top of a navigation controller and how to respond to its single method.
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Listing 9.7 Functionality required to call up a new person view controller
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-(IBAction)newContact:(id)sender { ABNewPersonViewController *myAdder = [[ABNewPersonViewController alloc] init]; myAdder.newPersonViewDelegate = self; UINavigationController *myNav = [[UINavigationController alloc] initWithRootViewController:myAdder];
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[self presentModalViewController:myNav animated:YES]; [myAdder release]; [myNav release]; } - (void)newPersonViewController: (ABNewPersonViewController *)newPersonViewController didCompleteWithNewPerson:(ABRecordRef)person { [self dismissModalViewControllerAnimated:YES]; }
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The other two view controllers work the same way, except for the specifics about what methods each protocol defines. The ABPersonViewController displays the information for a specific user. You ll need to set the displayedPerson property to an ABRecordRef before you call it up. This ABRecordRef might have been retrieved from the Address Book search functions or from the people picker, using the functions we ve already discussed. The person view controller can optionally be editable. There s one method listed in the protocol, which activates when an individual property is selected. Finally, the ABUnknownPersonViewController allows you to display the ABRecordRef defined by displayedPerson as if it were a real contact. Optionally, the user can create that information as a new contact, add it to an existing contact, or take property-based actions, like calling a number or showing a URL. It s a great way to give users the option to add contact info for your software company to their Address Book. You should now understand the basics of how to use the Address Book in your own programs.
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The Core Data framework is a data storage system that was added to the iPhone SDK 3.0. It provides a powerful and structured method to save and retrieve persistent data on the iPhone and iPad. Core Data is based on the design methodology of Model-View-Controller. It s intended as the model and provides such functionality. This allows the data to be completely separate from the views and controllers, giving the developer more control of their application. Traditionally, when you wanted to save structured data on the device, you looked to such methods as SQLite or serialization. Core Data can be considered a hybrid of these two with some added functionality. It gives you the power of SQL with the simplicity of serialization. Core Data allows you to take objects you already have in your application and save them directly into a database. You no longer need to do complex queries or make sure that your object property names match up with your database field names. Core Data handles these tasks for you. Because Core Data is such a large topic, we ll only scratch the surface of what s possible. The next subsections will teach you how to use Core Data by walking you through a simple example of creating a to-do list application. Your application will
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