CNContact display name objective c / swift - ios

Question

I am working on app where I need to import contacts into NSMutableDictionary, but sometimes people not filling all contact details. So leaving just number or company name. Do I need to go through all contacts detail to check what field will be my "display name". In Android I know there is displayName variable. But how it is in Swift or Objective C?
My code:
BOOL success = [addressBook
enumerateContactsWithFetchRequest:request
error:&contactError
usingBlock:^(CNContact *contact, BOOL *stop){
NSString * contactId = contact.identifier;
NSString * firstName = contact.givenName;
NSString * lastName = contact.familyName;
}];

Answer 1

Use CNContactFormatter to build the display name. When specifying the keys for the request, use descriptorForRequiredKeysForStyle to make sure you requested the appropriate fields.
In Swift, it would be:
let store = CNContactStore()
store.requestAccess(for: .contacts) { granted, error in
guard granted else {
print(error?.localizedDescription ?? "Unknown error")
return
}
let request = CNContactFetchRequest(keysToFetch: [CNContactIdentifierKey as CNKeyDescriptor, CNContactFormatter.descriptorForRequiredKeys(for: .fullName)])
let formatter = CNContactFormatter()
formatter.style = .fullName
do {
try store.enumerateContacts(with: request) { contact, stop in
if let name = formatter.string(from: contact) {
print(name)
}
}
} catch let fetchError {
print(fetchError)
}
}
You suggested that you have situations where there is neither name nor company, but just phone number. Well, then, you'd have to manually handle that yourself:
let request = CNContactFetchRequest(keysToFetch: [CNContactIdentifierKey as CNKeyDescriptor, CNContactPhoneNumbersKey as CNKeyDescriptor, CNContactFormatter.descriptorForRequiredKeys(for: .fullName)])
do {
try store.enumerateContacts(with: request) { contact, stop in
if let name = formatter.string(from: contact) {
print(name)
} else if let firstPhone = contact.phoneNumbers.first?.value {
print(firstPhone.stringValue)
} else {
print("no name; no number")
}
}
} catch let fetchError {
print(fetchError)
}
For Swift 2, see previous revision of this answer.

Answer 2

You can fetch contact name from your phone book using this code:-
- (void) fetchContacts
{
CNAuthorizationStatus status = [CNContactStore authorizationStatusForEntityType:CNEntityTypeContacts];
if (status == CNAuthorizationStatusDenied || status == CNAuthorizationStatusDenied) {
UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:#"This app previously was refused permissions to contacts; Please go to settings and grant permission to this app so it can use contacts" preferredStyle:UIAlertControllerStyleAlert];
[alert addAction:[UIAlertAction actionWithTitle:#"OK" style:UIAlertActionStyleDefault handler:nil]];
[self presentViewController:alert animated:TRUE completion:nil];
return;
}
CNContactStore *store = [[CNContactStore alloc] init]; [store requestAccessForEntityType:CNEntityTypeContacts completionHandler:^(BOOL granted, NSError * _Nullable error) {
// make sure the user granted us access
if (!granted) {
dispatch_async(dispatch_get_main_queue(), ^{
// user didn't grant access;
// so, again, tell user here why app needs permissions in order to do it's job;
// this is dispatched to the main queue because this request could be running on background thread
});
return;
}
// build array of contacts
NSMutableArray *contacts = [NSMutableArray array];
NSError *fetchError;
CNContactFetchRequest *request = [[CNContactFetchRequest alloc] initWithKeysToFetch:#[CNContactIdentifierKey, [CNContactFormatter descriptorForRequiredKeysForStyle:CNContactFormatterStyleFullName]]];
BOOL success = [store enumerateContactsWithFetchRequest:request error:&fetchError usingBlock:^(CNContact *contact, BOOL *stop) {
[contacts addObject:contact];
}];
if (!success) {
NSLog(#"error = %#", fetchError);
}
// you can now do something with the list of contacts, for example, to show the names
CNContactFormatter *formatter = [[CNContactFormatter alloc] init];
for (CNContact *contact in contacts) {
if (!_contacts) {
_contacts = [[NSMutableArray alloc] init];
}
NSString *string = [formatter stringFromContact:contact];
NSLog(#"contact = %#", string);
[_contacts addObject:string];
}
[_contactatableview reloadData];
}];
}

Answer 3

#import <Contacts/Contacts.h>
#import <ContactsUI/ContactsUI.h>
- (IBAction)displayContact:(id)sender {
id keysToFetch = #[[CNContactViewController descriptorForRequiredKeys]];
CNContact *contact = [self.store unifiedContactWithIdentifier:self.contactIdentifier keysToFetch:keysToFetch error:nil];
self.controller = [[CNContactViewController alloc] init];
[self.controller.view setFrameSize:NSMakeSize(500, 500)];
[self presentViewController:self.controller asPopoverRelativeToRect:self.view.bounds ofView: self.view preferredEdge: NSMaxXEdge behavior:NSPopoverBehaviorTransient];
self.controller.contact = contact;
}

Answer 4

To fetch contacts from devices
if (isIOS9) { //checking iOS version of Device
CNContactStore *store = [[CNContactStore alloc] init];
//keys with fetching properties
NSArray *keys = #[CNContactFamilyNameKey, CNContactGivenNameKey, CNContactPhoneNumbersKey, CNContactEmailAddressesKey,CNContactPostalAddressesKey, CNLabelWork, CNLabelDateAnniversary];
NSString *containerId = store.defaultContainerIdentifier;
NSPredicate *predicate = [CNContact predicateForContactsInContainerWithIdentifier:containerId];
NSError *error;
NSArray *cnContacts = [store unifiedContactsMatchingPredicate:predicate keysToFetch:keys error:&error];
DLOG(#"cnContacts %lu",(unsigned long)cnContacts.count);
if (error) {
//error
} else {
for (CNContact *contact in cnContacts) {
//iterate over cnContacts to get details
}
}
} else {
//for below iOS 9
ABAddressBookRef addressBook = ABAddressBookCreate();
CFArrayRef arrPersons = ABAddressBookCopyArrayOfAllPeople(addressBook);
CFIndex count = ABAddressBookGetPersonCount(addressBook);
NSLog(#"cnContacts %lu",(unsigned long)count);
for (int i = 0; i < count; i++) {
ABRecordRef record = CFArrayGetValueAtIndex(arrPersons,i);
//use kABPersonBirthdayProperty to get b’day
NSString *birthDay = (__bridge NSString *)(ABRecordCopyValue(record, kABPersonBirthdayProperty));
NSLog(#“B’day %#”, birthDay);
}
}