Objective C: add contact to xmpp framework via app - ios

Question

I am doing Chat App. XMPP Framework, automatically fetch contacts from ejabbered server. I am unable to add contacts to ejabbered server through my app. For ex: If I login through iOS Client, Jitsi, there I can give add contact. That too immediately reflect in my app and ejabbered server automatically. I dont know how to add my phone book contacts to ejabbered via my app.
Kindly guide how to add contact through my app.
Coding
- (void)setupStream
{
XMPPJID jid = [XMPPJID jidWithString:[NSString stringWithFormat:#"%##localhost",
`addBuddyTextField.text]];
[appDelegate.xmppRoster addUser:jid withNickname:addBuddyTextField.text];
xmppStream = [[XMPPStream alloc] init];
xmppReconnect = [[XMPPReconnect alloc] init];
xmppRosterStorage = [[XMPPRosterCoreDataStorage alloc] init];
xmppRoster = [[XMPPRoster alloc] initWithRosterStorage:xmppRosterStorage];
xmppRoster.autoFetchRoster = YES;
xmppRoster.autoAcceptKnownPresenceSubscriptionRequests = YES;
}

Answer 1

For adding contacts first you need to send subscribe message to destination user (if destination user is registered to XMPP)
Send subscribe message
- (void) sendSubscribeMessageToUser:(NSString*)userID
{
XMPPJID* jbid= [XMPPJID jidWithString:userID];
XMPPPresence *presence = [XMPPPresence presenceWithType:#"subscribe" to:jbid];
[xmppStream sendElement:presence];
}
when destination user received subscribe message
/**
This fuction is called when other user state is changed
*/
- (void)xmppStream:(XMPPStream *)sender didReceivePresence:(XMPPPresence *)presence
{
DDLogVerbose(#"%#: %# - %#", THIS_FILE, THIS_METHOD, [presence fromStr]);
NSString *presenceType = [presence type]; // online/offline
NSString *myUsername = [[sender myJID] user];
NSString *presenceFromUser = [[presence from] user];
NSString* presenceState= [presence status];
NSLog(#"%# is %# state %#",presenceFromUser,presenceType,presenceState);
if ([presenceType isEqualToString:#"subscribe"])
{
[xmppRoster subscribePresenceToUser:[presence from]];
}
else if ([presenceType isEqualToString:#"subscribed"])
{
[xmppRoster subscribePresenceToUser:[presence from]];
}
}
these functions will add automatically destination user to your contact list