xmpp

    XMPPStream *xmppStream;

    XMPPReconnect *xmppReconnect;
    
    XMPPRoster *xmppRoster;//用户对象

//需要添加的对象

    //添加好友
    #pragma mark 加好友
- (void)XMPPAddFriendSubscribe:(NSString *)name
{
  //XMPPHOST 就是服务器名，  主机名  
    XMPPJID *jid = [XMPPJID jidWithString:[NSString stringWithFormat:@"%@@%@",name,XMPPHOST]];
    //[presence addAttributeWithName:@"subscription" stringValue:@"好友"];
    [xmppRoster subscribePresenceToUser:jid];
    
}

            //处理加好友
          #pragma mark 处理加好友回调,加好友
- (void)xmppRoster:(XMPPRoster *)sender didReceivePresenceSubscriptionRequest:(XMPPPresence *)presence
{
    //取得好友状态
    NSString *presenceType = [NSString stringWithFormat:@"%@", [presence type]]; //online/offline
    //请求的用户
    NSString *presenceFromUser =[NSString stringWithFormat:@"%@", [[presence from] user]];
    NSLog(@"presenceType:%@",presenceType);
    
    NSLog(@"presence2:%@  sender2:%@",presence,sender);
    
    XMPPJID *jid = [XMPPJID jidWithString:presenceFromUser];
    [xmppRoster acceptPresenceSubscriptionRequestFrom:jid andAddToRoster:YES];

}

           //在次处理加好友
#pragma mark 收到好友上下线状态
- (void)xmppStream:(XMPPStream *)sender didReceivePresence:(XMPPPresence *)presence {
//    DDLogVerbose(@"%@: %@ ^^^ %@", THIS_FILE, THIS_METHOD, [presence fromStr]);
    
    //取得好友状态
    NSString *presenceType = [NSString stringWithFormat:@"%@", [presence type]]; //online/offline
    //当前用户
//    NSString *userId = [NSString stringWithFormat:@"%@", [[sender myJID] user]];
    //在线用户
    NSString *presenceFromUser =[NSString stringWithFormat:@"%@", [[presence from] user]];
    NSLog(@"presenceType:%@",presenceType);
    NSLog(@"用户:%@",presenceFromUser);
//这里再次加好友
    if ([presenceType isEqualToString:@"subscribed"]) {
        XMPPJID *jid = [XMPPJID jidWithString:[NSString stringWithFormat:@"%@",[presence from]]];
	[xmppRoster acceptPresenceSubscriptionRequestFrom:jid andAddToRoster:YES];
    }
}

#pragma mark 删除好友,取消加好友，或者加好友后需要删除
- (void)removeBuddy:(NSString *)name
{
	XMPPJID *jid = [XMPPJID jidWithString:[NSString stringWithFormat:@"%@@%@",name,XMPPHOST]];
	
	[self xmppRoster] removeUser:jid];
}

注意主机名  和 处理顺序