iOS: XMPPRoster Gets the list of Invited buddies as well

iOS: XMPPRoster Gets the list of Invited buddies as well

I am building an iOS chat application (POC) using the XMPPframework. I
have been able to register, send invites, accept invitation and chat.
However when I try to populate my buddy list using the Roster, I get the
names of all the buddies whom I have already added as well as whom I have
sent Friend request. I am not able to differentiate between them. I have
tried to dig into the XMPPRosterMemoryStorage class but all the methods
are returning the same list (sorted/unsorted).
How to show an invited buddy as pending if he has not accepted the
invitation yet.
Please help.
Thanks.