ios - ABAddressBookCopyArrayOfAllPeopleInSourceWithSortOrdering 不工作

Question

ABAddressBookRef addressBook = ABAddressBookCreateWithOptions(NULL, error);

__block BOOL accessGranted = NO;
if (ABAddressBookRequestAccessWithCompletion != NULL) { // we're on iOS 6
    dispatch_semaphore_t sema = dispatch_semaphore_create(0);
    ABAddressBookRequestAccessWithCompletion(addressBook, ^(bool granted, CFErrorRef error) {
        accessGranted = granted;
        dispatch_semaphore_signal(sema);
    });
    dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);

}
else { // we're on iOS 5 or older
    accessGranted = YES;
}

if (accessGranted) {

//  ABAddressBookRef addressBook = ABAddressBookCreateWithOptions(NULL, error);
    ABRecordRef source = ABAddressBookCopyDefaultSource(addressBook);
    CFArrayRef allPeople = ABAddressBookCopyArrayOfAllPeopleInSourceWithSortOrdering(addressBook, source, kABPersonSortByFirstName);
    CFIndex nPeople = ABAddressBookGetPersonCount(addressBook);
    NSMutableArray* items = [NSMutableArray arrayWithCapacity:nPeople];
}

我使用此代码获取所有联系人，但 ABAddressBookGetPersonCount 工作正常，但 ABAddressBookCopyArrayOfAllPeopleInSourceWithSortOrdering 不工作。

Answer 1

几个问题:

1. 您可以简化获取人员数组的过程，例如:

   if (accessGranted) {
       ABRecordRef source = ABAddressBookCopyDefaultSource(addressBook);
       NSArray *allPeople = CFBridgingRelease(ABAddressBookCopyArrayOfAllPeopleInSourceWithSortOrdering(addressBook, source, kABPersonSortByFirstName));
       NSUInteger nPeople = [allPeople count];
   
       // do what you want with the array
   
       // don't forget to release `source`; because we bridged allPeople, ARC will take care of that
   
       CFRelease(source);
   }
   

2. 您很可能没有正确捕获打开错误。应该是:

   CFErrorRef error = NULL;
   ABAddressBookRef addressBook = ABAddressBookCreateWithOptions(NULL, &error);
   if (!addressBook) {
       NSLog(@"Error opening address book: %@", CFBridgingRelease(error));
       return;
   }
   

   注意，你要避免的是

   CFErrorRef *error = NULL;
   ABAddressBookRef addressBook = ABAddressBookCreateWithOptions(NULL, error);
   

   您偶尔会在 Stack Overflow 上看到这种模式，但它是不正确的。这永远不会返回错误对象。

3. 您不应该使用那样的信号量，因为您在等待用户第一次授予权限时会阻塞主线程。如果您在错误的时间这样做，看门狗进程可能会终止您的应用。

   相反，采用异步模式，将在用户授予权限后应运行的代码放在 ABAddressBookRequestAccessWithCompletion 调用的完成 block 参数中。但切勿将信号量与此异步权限 API 结合使用。

4. 您可能已经知道如何执行此操作，但是例如，要获取人员的姓名，您可以执行以下操作:

   for (NSInteger i = 0; i < nPeople; i++) {
       ABRecordRef person = (__bridge ABRecordRef)allPeople[i];
       NSString *firstName = CFBridgingRelease(ABRecordCopyValue(person, kABPersonFirstNameProperty));
       NSString *lastName = CFBridgingRelease(ABRecordCopyValue(person, kABPersonLastNameProperty));
       NSLog(@"%@ %@", firstName, lastName);
   }
   

5. 记得通过静态分析器运行代码(shift+command+B，或者 Xcode 的“Analyze” Product"菜单)，它非常擅长识别代码中可能困扰地址簿代码的漏洞。

   请记住“Create Rule”，即任何时候调用名称中带有Create 或Copy 的Core Foundation 函数时，您有责任释放对象，调用 CFRelease 或使用 CFBridgingRelease(或 __bridge_transfer)将所有权转移给 ARC。