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基本上，我正在尝试使用 ejabberd 服务器与我域上的所有注册用户创建一个聊天室。因此，当用户进入聊天室时，他可以看到该域上的所有其他在线注册用户。

到目前为止，我只能在 XMPP 框架的帮助下让所有用户的“朋友/好友”可见并在朋友上线或下线时发送通知：

- (void)xmppStream:(XMPPStream *)sender didReceivePresence:(XMPPPresence *)presence {
// a buddy went offline/online
NSString *presenceType = [presence type]; // online/offline
NSString *myUsername = [[sender myJID] user];
NSString *presenceFromUser = [[presence from] user];
if (![presenceFromUser isEqualToString:myUsername]) {
    if ([presenceType isEqualToString:@"available"]) {
        [_chatDelegate newBuddyOnline:[NSString stringWithFormat:@"%@@%@", presenceFromUser, @"chat.denederlandsewateren.nl"]];
    } else if ([presenceType isEqualToString:@"unavailable"]) {
        [_chatDelegate buddyWentOffline:[NSString stringWithFormat:@"%@@%@", presenceFromUser, @"chat.denederlandsewateren.nl"]];
    }
}
}

我可以获得所有在线注册用户的列表，但我不知道当有人上线或下线时如何通知用户。

- (void)getAllRegisteredUsers {

xmppRosterMemStorage = [[XMPPRosterMemoryStorage alloc] init];
xmppRoster = [[XMPPRoster alloc] initWithRosterStorage:xmppRosterMemStorage
                                         dispatchQueue:dispatch_get_main_queue()];
[xmppRoster addDelegate:self delegateQueue:dispatch_get_main_queue()];
xmppRoster.autoAcceptKnownPresenceSubscriptionRequests = false;
xmppRoster.autoFetchRoster = true;
[xmppRoster activate:xmppStream];
[xmppRoster fetchRoster];

NSError *error = [[NSError alloc] init];
NSXMLElement *query = [[NSXMLElement alloc] initWithXMLString:@"<query xmlns='http://jabber.org/protocol/disco#items' node='all users'/>"
                                                        error:&error];
XMPPIQ *iq = [XMPPIQ iqWithType:@"get"
                             to:[XMPPJID jidWithString:@"chat.denederlandsewateren.nl"]
                      elementID:[xmppStream generateUUID] child:query];
[xmppStream sendElement:iq];

}

- (BOOL)xmppStream:(XMPPStream *)sender didReceiveIQ:(XMPPIQ *)iq
{
NSXMLElement *queryElement = [iq elementForName: @"query" xmlns:     

@"http://jabber.org/protocol/disco#items"];

if (queryElement) {
    NSArray *itemElements = [queryElement elementsForName: @"item"];
    NSMutableArray *mArray = [[NSMutableArray alloc] init];
    for (int i=0; i<[itemElements count]; i++) {

        NSString *jid=[[[itemElements objectAtIndex:i] attributeForName:@"jid"] stringValue];
        [mArray addObject:jid];
        [xmppRoster addUser:[XMPPJID jidWithString:jid] withNickname:[[jid componentsSeparatedByString:@"@"] objectAtIndex:0]];

    }



}

如何使用 Ejabberd 服务器和 XMPP 框架创建一个聊天室，用户可以在其中看到一个域上的所有在线注册用户？

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