Question

我使用了以下代码块来检索联系人。问题是，没有赋值，它似乎在“contacts”数组中，如最后预期的那样。我是iOS新手中的新手。如果有人可以帮助我，谢谢你。

CFErrorRef * error = NULL;
ABAddressBookRef addressBook = ABAddressBookCreateWithOptions(NULL, error);
ABAddressBookRequestAccessWithCompletion(addressBook, ^(bool granted, CFErrorRef error)
{
    if (granted)
    {
        dispatch_async(dispatch_get_main_queue(), ^{
            CFArrayRef allPeople = ABAddressBookCopyArrayOfAllPeople(addressBook);
            CFIndex numberOfPeople = ABAddressBookGetPersonCount(addressBook);

            for(int i = 0; i < numberOfPeople; i++){

                ABRecordRef person = CFArrayGetValueAtIndex( allPeople, i );
                NSString *firstName = (__bridge NSString *)(ABRecordCopyValue(person, kABPersonFirstNameProperty));
                NSString *lastName = (__bridge NSString *)(ABRecordCopyValue(person, kABPersonLastNameProperty));
                NSString *name = [NSString stringWithFormat:@"%@ %@", firstName, lastName];


                ABMultiValueRef emails = ABRecordCopyValue(person, kABPersonEmailProperty);
                NSUInteger j = 0;
                if (emails) {
                    for (j = 0; j < ABMultiValueGetCount(emails); j++) {
                        NSString *email = (__bridge_transfer NSString *)ABMultiValueCopyValueAtIndex(emails, j);
                        if (j == 0) {
                            [emailConatcts setValue:email forKey:name];
                            [contacts addObject:emailConatcts];
                        }
                    }
                }
                    ABMultiValueRef phoneNumbers = ABRecordCopyValue(person, kABPersonPhoneProperty);
                    if (phoneNumbers) {
                        CFIndex numberOfPhoneNumbers = ABMultiValueGetCount(phoneNumbers);
                        for (CFIndex i = 0; i < numberOfPhoneNumbers; i++) {
                            CFStringRef label = ABMultiValueCopyLabelAtIndex(phoneNumbers, i);
                            if (label) {
                                if (CFEqual(label, kABPersonPhoneMobileLabel)) {
                                    NSString *phoneNumber = (__bridge_transfer NSString *) ABMultiValueCopyValueAtIndex(phoneNumbers, i);
                                    [mobileContacts setValue:phoneNumber forKey:name];
                                    [contacts addObject:emailConatcts];
                                }
                            }
                        }
                    }
               }
        });
    }

});
NSLog(@"contacts: %@", contacts);

Answer 1

在您明确拥有联系人之前，您正在询问联系人。如果你移动这一行

NSLog(@"contacts: %@", contacts);

之前

        });
    }
});

你应该看到数据。

原因是，当您使用dispach和completion块时，您告诉系统在某个操作完成后运行该代码（通常在不同的线程中）。因此，当您打印联系人时，该阻止代码尚未运行。

所以无论你需要对联系人做什么，都要在那个区块内调用它：）

地址簿 - 检索联系人

1 个答案: