February 2012
Intermediate to advanced
872 pages
22h 43m
English
Content preview from iOS 5 Programming CookbookBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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10.1. Retrieving a Reference to an Address Book
Problem
You would like to work with a user’s contacts. To do this, first you need to get a reference to the user’s address book database. This reference is what you use to retrieve entries, as well as to make and save changes.
Solution
Use the ABAddressBookCreate
function in the Address Book framework:
- (BOOL) application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions{ ABAddressBookRef addressBook = ABAddressBookCreate(); if (addressBook != nil){ NSLog(@"Successfully accessed the address book."); /* Work with the address book here */ /* Let's see if we have made any changes to the address book or not, before attempting to save it */ if (ABAddressBookHasUnsavedChanges(addressBook)){ /* Now decide if you want to save the changes to the address book */ NSLog(@"Changes were found in the address book."); BOOL doYouWantToSaveChanges = YES; /* We can make a decision to save or revert the address book back to how it was before */ if (doYouWantToSaveChanges){ CFErrorRef saveError = NULL; if (ABAddressBookSave(addressBook, &saveError)){ /* We successfully saved our changes to the address book */ } else { /* We failed to save the changes. You can now access the [saveError] variable to find out what the error is */ } } else { /* We did NOT want to save the changes to the address book so let's revert it to how it was before */ ABAddressBookRevert(addressBook); } } else { /* We have not made any changes to ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.