Get value from CFDictionaryRef by converting it to NSDictionary.

GetValueFromCFDictionaryRef.m

+ (NSString *)getValueFromCFDictionaryRef {
    // Assume you have record ID.
    NSInteger recordID;
    // Get a person record.
    ABAddressBookRef addressBook = ABAddressBookCreate();
    ABRecordRef person = ABAddressBookGetPersonWithRecordID(addressBook, recordID);
    // Get addresses data from person. Watch out it's a multi-value property.
    ABMultiValueRef addresses = ABRecordCopyValue(person, kABPersonAddressProperty);
    // Get the first one. Convert it from CFDictionaryRef to NSDictionary.
    NSDictionary *address = (NSDictionary *)CFBridgingRelease(ABMultiValueCopyValueAtIndex(addresses, 0));
    // Convert a dictionary key too, and get its value.
    NSString *city = address[(NSString *)CFBridgingRelease(kABPersonAddressCityKey)];
    // Don't forget to release objects.
    CFRelease(addresses);
    CFRelease(addressBook);
    return city;
}