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CHAPTER 9 CFRelease(searchResults); CFRelease(addressBook); }
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Data: advanced techniques
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You start by running ABAddressBookCreate, which makes a local copy of the Address Book B. You ll need to do this whenever you re working manually with the Address Book. After that, you use a few general Address Book functions that let you do things like count your number of contacts and groups. But it s the search function that s most important C. This is one of two ways you can extract contacts from the Address Book by hand, the other being ABAddressBookCopyArrayOfAllPeople. Note the typing of searchBar.text as CFStringRef. This is a Core Foundation class equivalent to NSString *; you can find more information about the details of Core Foundation in the section Using Core Foundation. The preceding steps are the major ones that differentiate working with the Address Book manually from working with it through a UI. With the Address Book framework, your program does the selection of contact records; with the UI framework, the user does it through a graphical interface. Beyond that, things work similarly via either methodology. When you have a list of contacts, you need to extract individuals from the array D. You can then use numerous functions to look at their properties. ABRecordCopyCompositeName gives you a full name already put together, and ABRecordCopyValue lets you pick out other properties. The list of properties and returned values is in the ABPerson reference. Multivalues are only a little more difficult to use than simple properties. You use ABRecordCopyValue as usual E, but then you have to work through the entire multivalue, which is effectively an associative array. The easiest thing to do is extract all the individual labels and values F. This program displays the slightly awkward label names (for your reference), but you probably won t usually want to show off words like $!<Mobile>!$, and it s easy enough to strip them out. The program ends by cleaning up some of the Core Foundation objects, using the standard Core Foundation memory-management functions. When you run it, this program displays some of the data from names that Figure 9.2 As shown here on you search for, as shown in figure 9.2. the iPhone, the Address Book You can do lots more with the Address Book, but framework gives you low-level this should outline the basics of how to access its several access to contact information. classes.
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Accessing the Address Book
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There are definitely times when you ll want to work with the low-level Address Book functions you ve seen so far. But you also don t want to reinvent the wheel. If you need to let a user select, edit, or insert a new contact, you don t need to program the UI. Instead, you can use the Address Book UI framework, which has all that functionality preprogrammed. The Address Book UI framework contains only the four classes that we summarized in table 9.3: ABPeoplePickerNavigationController, ABNewPersonViewController, ABPersonViewController, and ABUnknownPersonViewController. Each of these UI objects is as the names suggest a view controller. To be precise, they re highly specialized modal controllers that each assist you in a single Address Book related task. Each controller also has a delegate protocol, which is how you link to a class that s already pretty fully realized. We ll touch on each of these classes, but we ll give a lot of attention to only the people picker (ABPeoplePickerNavigationController).
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THE PEOPLE PICKER VIEW CONTROLLER
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To demonstrate the people picker, you ll put together a quick utility with substantially identical functionality to the previous Address Book example. But rather than searching for multiple users using the Address Book framework, the user will instead select a specific user using the Address Book UI framework. This program is built with a couple of Interface Builder created objects. A UIToolBar with a single button allows the user to activate the program via the selectContact: method, and text will once more be displayed in a non-editable UITextView called myText. The program is shown in listing 9.6.
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