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The app delegate needs to create the navigator, initialize the menu object, build the first level of the menu hierarchy, and clean things up afterward. Listing 9.4 shows the couple of steps required to do this.
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Using SQLite
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Figure 9.1 This menu was created directly from a database.
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Listing 9.4
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The app delegate that glues together these classes
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- (void)applicationDidFinishLaunching: (UIApplication *)application { myMenu = [[SKMenu alloc] initWithFile:@"nav.db"]; DatabaseViewController *newController = [[DatabaseViewController alloc] initWithParentid:0 Menu:myMenu]; newController.title = @"DB Menu"; [self.navigationController pushViewController:newController animated:NO]; [newController release]; [window addSubview:[navigationController view]]; [window makeKeyAndVisible]; } - (void)dealloc { [myMenu release]; [navigationController release]; [window release]; [super dealloc]; }
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The applicationDidFinishLaunching: method sets things up. After initializing the menu, it creates the first database view controller and pushes it onto the navigation stack. The dealloc method later closes everything out. Note that it releases the
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Data: advanced techniques
menu object, which in turn will close the database and release that, ending the menu s lifecycle. Not shown here is the Interface Builder file, which includes one object, a navigation controller. Its standard view controller should be deleted, because you ll be replacing it here. Though it s relatively basic, you now have a hierarchical menu of tables built entirely from a database.
Expanding this example
This example showed not only how to use databases in a real application but also how to put together a more complex project. Nonetheless, if you wanted to make regular use of the database and menu classes, you d probably want to expand it more. We ve already noted that SKDatabase could use more functionality and that the database view controller needs to do something for the result pages that it arrives on. Because this is all database driven, you can also hand off considerable power to the users. It would be easy to expand this example so that users could create their own rows in menus and reorder the existing ones. With SQLite now covered to the depth we can give it, we ll move on to another major method of data retrieval, one of equal complexity: the Address Book.
Accessing the Address Book
Like SQLite, the Address Book is too complex to wholly document within the constraints of this chapter. It s made up of two different frameworks the Address Book framework and the Address Book UI framework and together they contain over a dozen references. Fortunately, Apple offers an extensive tutorial on the Address Book: Address Book Programming Guide for iPhone OS. In this section, we ll provide a basic reference that supplements Apple s own tutorial, but we suggest you read their guide for more extensive information. We ll look at the Address Book frameworks, show how to access the Address Book s properties, and explain how to use the Address Book UI.
An overview of the frameworks
As noted, there are two frameworks for the Address Book. The Address Book framework contains what you d expect: information on the data types that make up the Address Book and how to access them. The Address Book UI framework contains a bunch of handy interfaces that allow you to hand off the selection and editing of Address Book entries to modal view controllers that Apple has already written. To use this functionality, you must include one or both frameworks, plus the appropriate include files: AddressBook/AddressBook.h and AddressBookUI/AddressBookUI.h. Table 9.3 lists many of the most important classes in the frameworks.
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Accessing the Address Book
Table 9.3 The Address Book classes, the framework they belong to, and what they do Class ABAddressBook Framework Address Book Summary
Interface for accessing and changing the Address Book; may not be required if you use the Address Book UI framework Interface for entering new record manually Interface for selecting users and properties Interface for displaying and editing records Interface for displaying fake contact and possibly adding it to Address Book Opaque type giving access to the records of groups Opaque type giving access to the records of individual people Record providing information on a person or group Type containing multiple values, each with its own label; its precise use is defined in ABPerson, where it s applied to addresses, dates, phone numbers, instant messages, URLs, and related names An ABMultiValue whose values can be modified
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