代理都给 移除了，怎么让xmpp回调，

 肺都切除了，还让怎样呼吸，

//下线

- (void)goOffline

{

    XMPPPresence *presence = [XMPPPresencepresenceWithType:@"unavailable"];

    [mStream sendElement:presence];

//    [mStream removeDelegate:self];

[mStreamdisconnect];

}