HALAddressBook.m

#import "HALAddressBook.h"

@interface HALAddressBook ()

// Redeclare the readonly properties
@property ABAddressBookRef m_addressbook;
@property (readwrite) ABMultiValueRef contactPhoneNumber;

@end

@implementation HALAddressBook

#pragma mark - Request Access

- (BOOL)requestAccess
{
    //Asks for access to Address Book.
    self.m_addressbook =  ABAddressBookCreateWithOptions(NULL, NULL);

    ABAddressBookCopyArrayOfAllPeople(self.m_addressbook);

    __block BOOL accessGranted = NO;
    if (ABAddressBookRequestAccessWithCompletion != NULL) {
        dispatch_semaphore_t sema = dispatch_semaphore_create(0);
        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
            @autoreleasepool {
                // Write your code here...
                // Fetch data from SQLite DB
            }
        });

        ABAddressBookRequestAccessWithCompletion(self.m_addressbook, ^(bool granted, CFErrorRef error)

                                                 {
                                                     accessGranted = granted;

                                                     dispatch_semaphore_signal(sema);
                                                 });

        dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
    }

    if (accessGranted) {
        // Access has been granted
        return YES;
    }
    // Access has not been granted
    return NO;
}

#pragma mark Accessor Methods

- (NSArray *)allContacts
{
    if (_allContacts.count == 0) {

        _allContacts = (__bridge_transfer NSArray*)ABAddressBookCopyArrayOfAllPeople(self.m_addressbook);
    }

  return _allContacts;
}

@end