I have created room with XMPPFramework in objc .. I created it successfully but when I m going to offline that time room was destroy. I also no idea where I should place invite function to add user in group (room). please sort out for me.
It's destroyed probably because you created a temporary room, which is destroyed after last occupant left it.
XMPP rooms can be persistent vs. temporary
Here is a XEP-0045 config on how to handle it
<field
label='Make Room Persistent?'
type='boolean'
var='muc#roomconfig_persistentroom'>
<value>1</value>
</field>
https://xmpp.org/extensions/xep-0045.html#registrar-formtype-owner