Fetch only that phone contacts who are using the same app - ios

Question

I am developing an application in which I want to fetch contacts who are using the same application from my contact list in iphone.
How to do it? Any sample code or link ?
Please help me.
Note : I don't want to fetch all contacts in my ios application, I
just want to fetch the contacts who are using the same application.

Answer 1

import AddressBook framework first
Then call these two functions
-(void)AddressBookFetch{
ABAuthorizationStatus status = ABAddressBookGetAuthorizationStatus();
if (status == kABAuthorizationStatusDenied || status == kABAuthorizationStatusRestricted) {
// if you got here, user had previously denied/revoked permission for your
// app to access the contacts, and all you can do is handle this gracefully,
// perhaps telling the user that they have to go to settings to grant access
// to contacts
[[[UIAlertView alloc] initWithTitle:nil message:#"This app requires access to your contacts to function properly. Please visit to the \"Privacy\" section in the iPhone Settings app." delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil] show];
return;
}
CFErrorRef error = NULL;
ABAddressBookRef addressBook = ABAddressBookCreateWithOptions(NULL, &error);
if (!addressBook) {
NSLog(#"ABAddressBookCreateWithOptions error: %#", CFBridgingRelease(error));
return;
}
ABAddressBookRequestAccessWithCompletion(addressBook, ^(bool granted, CFErrorRef error) {
if (error) {
NSLog(#"ABAddressBookRequestAccessWithCompletion error: %#", CFBridgingRelease(error));
}
if (granted) {
// if they gave you permission, then just carry on
[self listPeopleInAddressBook:addressBook];
} else {
// however, if they didn't give you permission, handle it gracefully, for example...
dispatch_async(dispatch_get_main_queue(), ^{
// BTW, this is not on the main thread, so dispatch UI updates back to the main queue
[[[UIAlertView alloc] initWithTitle:nil message:#"This app requires access to your contacts to function properly. Please visit to the \"Privacy\" section in the iPhone Settings app." delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil] show];
});
}
CFRelease(addressBook);
});
}
Then list contact by this function
- (void)listPeopleInAddressBook:(ABAddressBookRef)addressBook
{
NSArray *allPeople = CFBridgingRelease(ABAddressBookCopyArrayOfAllPeople(addressBook));
numberOfPeople = [allPeople count];
for (NSInteger i = 0; i < numberOfPeople; i++) {
ABRecordRef person = (__bridge ABRecordRef)allPeople[i];
NSString *firstName = CFBridgingRelease(ABRecordCopyValue(person, kABPersonFirstNameProperty));
NSString *lastName = CFBridgingRelease(ABRecordCopyValue(person, kABPersonLastNameProperty));
NSLog(#"Name:%# %#", firstName, lastName);
if (firstName==nil) {
firstName=#"";
}
[nm addObject:firstName];
if (lastName==nil) {
lastName=#"";
}
[ttl addObject:lastName];
ABMultiValueRef phoneNumbers = ABRecordCopyValue(person, kABPersonPhoneProperty);
// CFIndex numberOfPhoneNumbers = ABMultiValueGetCount(phoneNumbers);
//for (CFIndex i = 0; i < numberOfPhoneNumbers; i++) {
NSString *phoneNumber = CFBridgingRelease(ABMultiValueCopyValueAtIndex(phoneNumbers, 0));
NSLog(#" phone:%#", phoneNumber);
if (phoneNumber==nil) {
phoneNumber=#"";
}
[phn addObject:phoneNumber];
// }
// CFRelease(phoneNumbers);
NSLog(#"=============================================");
}
}

Answer 2

Its not possible without back-end, you can not do it within only ios application.