Using CNContactStore in Objective C to query contacts info

contact.m

#import <Contacts/Contacts.h>

@implementation ContactsScan

- (void) contactScan
{
    if ([CNContactStore class]) {
        //ios9 or later
        CNEntityType entityType = CNEntityTypeContacts;
        if( [CNContactStore authorizationStatusForEntityType:entityType] == CNAuthorizationStatusNotDetermined)
         {
             CNContactStore * contactStore = [[CNContactStore alloc] init];
             [contactStore requestAccessForEntityType:entityType completionHandler:^(BOOL granted, NSError * _Nullable error) {
                 if(granted){
                     [self getAllContact];
                 }
             }];
         }
        else if( [CNContactStore authorizationStatusForEntityType:entityType]== CNAuthorizationStatusAuthorized)
        {
            [self getAllContact];
        }
    }
}

-(void)getAllContact
{
    if([CNContactStore class])
    {
        //iOS 9 or later
        NSError* contactError;
        CNContactStore* addressBook = [[CNContactStore alloc]init];
        [addressBook containersMatchingPredicate:[CNContainer predicateForContainersWithIdentifiers: @[addressBook.defaultContainerIdentifier]] error:&contactError];
        NSArray * keysToFetch =@[CNContactEmailAddressesKey, CNContactPhoneNumbersKey, CNContactFamilyNameKey, CNContactGivenNameKey, CNContactPostalAddressesKey];
        CNContactFetchRequest * request = [[CNContactFetchRequest alloc]initWithKeysToFetch:keysToFetch];
        BOOL success = [addressBook enumerateContactsWithFetchRequest:request error:&contactError usingBlock:^(CNContact * __nonnull contact, BOOL * __nonnull stop){
            [self parseContactWithContact:contact];
        }];
    }
}

- (void)parseContactWithContact :(CNContact* )contact
{
    NSString * firstName =  contact.givenName;
    NSString * lastName =  contact.familyName;
    NSString * phone = [[contact.phoneNumbers valueForKey:@"value"] valueForKey:@"digits"];
    NSString * email = [contact.emailAddresses valueForKey:@"value"];
    NSArray * addrArr = [self parseAddressWithContac:contact];
}

- (NSMutableArray *)parseAddressWithContac: (CNContact *)contact
{
    NSMutableArray * addrArr = [[NSMutableArray alloc]init];
    CNPostalAddressFormatter * formatter = [[CNPostalAddressFormatter alloc]init];
    NSArray * addresses = (NSArray*)[contact.postalAddresses valueForKey:@"value"];
    if (addresses.count > 0) {
        for (CNPostalAddress* address in addresses) {
            [addrArr addObject:[formatter stringFromPostalAddress:address]];
        }
    }
    return addrArr;
}

@end

I'm am trying to use you code to request permission to access contacts but the code for asking for permission doesn't get executed. Also, can the address book code that is deprecated be used for same purpose? Lastly, do you have any resources for iOS 9 documentation for objective c?

Hi macgusto88,

1. Can you make sure the device you are running on haven't determined contact permission for your App? Since the line 13 which try to access the permission will only execute if

 [CNContactStore authorizationStatusForEntityType:entityType] == CNAuthorizationStatusNotDetermined) 

is true
2. The deprecated API still work now, but at some point apple may remove it. This stackoverflow explain it
3. If you're referring CNContacStore framework, or other frameworks, Apple developer website would be the best place

Thank you!

Excelent Code, thanks very mouch

Thanks, excellent.

Hello willthink, Can I find the container source and its identifier like I want to fetch only google contacts from address book with its google id. is it possible?

Thanks!!