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Diving into Three20 and TTMessageController
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Let s get back to the AccountViewController.m file. This is the initial screen where user interaction happens. When building this demo, I wanted to ensure the experience for you would be smooth and simple. That s something that even the most advanced power users can appreciate. In doing so, I needed a clean interface that would allow me to compose my e-mail messages. I knew that at the time of this writing, the SDK did not allow me to access the Mail application without also leaving my application. This is when I ran into Joe Hewitt s exemplary open source library named Three20. Three20 is a set of Objective-C classes that you can reuse in your applications to either enhance its UI, add a photo picker that looks like Apple s, style your labels like you would with CSS, and do many other outstanding things. It s simply brilliant how trivial it was for me to build a compose e-mail view with the powerful functionality I required for this demo, including the capability to add multiple recipients, search my Address Book, add a subject, and be able to write text that I can easily scroll through. To do that, you ll use the Three20 class TTMessageController. Here is how you instantiate it when the composeMessage: selector is invoked:
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- (void)composeMessage:(id)sender { id recipient = [[[TTTableField alloc] initWithText:nil url:TT_NULL_URL] autorelease]; TTMessageController* controller = [[TTMessageController alloc] initWithRecipients:[NSArray arrayWithObject:recipient]]; self.messageController = controller; messageController.delegate = self; messageController.dataSource = dataSource; [controller release]; [self presentModalViewController:messageController animated:YES]; }
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Initially, you do not want any recipients to populate your recipient row. So, you use an instance of TTTableField as a dummy placeholder. The TTMessageController needs to be initialized with the initWithRecipients: methods, and here is where you provide the
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CHAPTER 7: Smart In-Application E-mail with Core Data and Three20
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recipient object. You assign the instance of AccountViewController as a delegate, and you assign a dataSource of TTAddressBookDataSource. TTAddressBookDataSource is not part of the Three20 library. It is a class I ve put together so that you can take advantage of pulling contacts from your Address Book. That adds a more realistic touch to the application. TTAddressBookDataSource resides in Classes Data Management TTAddressBookDataSource.h/TTAddressBookDataSource.m. One of my other favorite tricks is to use Cmd+D. There you can type in any file or symbol name you re searching for. The most interesting method in TTAddressBookDataSource looks like the following:
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+ (TTAddressBookDataSource *)abDataSourceForSearch:(BOOL)forSearch { ABAddressBookRef addressBook = ABAddressBookCreate(); NSArray *peopleArray = (NSArray *)ABAddressBookCopyArrayOfAllPeople(addressBook); NSMutableArray *allContacts = [NSMutableArray array]; for (id person in peopleArray) { if ([(NSString *)ABRecordCopyValue(person, kABPersonOrganizationProperty) autorelease]) continue; NSMutableString *firstName = [(NSString *)ABRecordCopyValue(person, kABPersonFirstNameProperty) autorelease]; NSMutableString *lastName = [(NSString *)ABRecordCopyValue(person, kABPersonLastNameProperty) autorelease]; ABMutableMultiValueRef multiValueEmail = ABRecordCopyValue(person, kABPersonEmailProperty); NSString *email = nil; if (ABMultiValueGetCount(multiValueEmail) > 0) { email = [(NSString *)ABMultiValueCopyValueAtIndex(multiValueEmail, 0) autorelease]; } else { continue; } Contact *aContact = [[[Contact alloc] initWithFirstName:firstName lastName:lastName email:email] autorelease]; [allContacts addObject:aContact]; } TTAddressBookDataSource *dataSource = initWithNames:allContacts] autorelease]; if (!forSearch) { [dataSource rebuildItems]; } CFRelease(addressBook); return dataSource; } [[[TTAddressBookDataSource alloc]
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What this code does is creates a reference to the Address Book and its respective database. You then return an array of all the people in your Address Book using the following code:
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CHAPTER 7: Smart In-Application E-mail with Core Data and Three20
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NSArray *peopleArray = (NSArray*)ABAddressBookCopyArrayOfAllPeople(addressBook);
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NOTE: Organizations you add to your Address Book will not be returned by this invocation! That might be clear by the verbose name of the function; however, it was something that had me stumped when I first started writing code with the AddressBook framework. The rest of the code should be rather self-explanatory. There is excellent documentation on programming with the AddressBook framework in the ADC. Feel free to use this as a reference in order to incorporate the AddressBook framework in your application.
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