如何在 iOS 的 openfire/xmpp 中获取所有在线用户的列表？答案

【问题标题】：How do I get a list of all online users in openfire/xmpp in iOS?如何在 iOS 的 openfire/xmpp 中获取所有在线用户的列表？
【发布时间】：2014-11-06 07:58:27
【问题描述】：

我正在在线/离线获得用户的存在。这样，如果我需要检查，我必须每次都发送请求才能获得存在

如何检查多个用户或仅在线用户？

【问题讨论】：

标签： ios xmpp openfire xmppframework

【解决方案1】：

我已经实现了 NSFetchedResultsControllerDelegate。我正进入（状态 “SectionNum”=0 中的在线用户列表。每当用户去离线/在线控制器的委托方法调用。相应地更新表格视图。

// NSFetchedResultsController *fetchedResultsController; //实例变量

in viewWillAppear

 //xmpp user array
    self.xmppUserArray=[[[self fetchedResultsController] fetchedObjects] mutableCopy];

    for (int i=0; i<[[self xmppUserArray] count]; i++) {

        if ([[[[self xmppUserArray] objectAtIndex:i] valueForKey:@"sectionNum"] integerValue]==0) {
            //this is user is online
            [[[AKSGetCareerGlobalClass SharedInstance] onlineUserArray] addObject:[[[self xmppUserArray] objectAtIndex:i] valueForKey:@"nickname"]];

        }
    }


//also implement method
- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller
{
    //remove previous data or clear array

    [[self xmppUserArray] removeAllObjects];
    [[[AKSGetCareerGlobalClass SharedInstance] onlineUserArray] removeAllObjects];


    //get data from core data
    self.xmppUserArray=[[[self fetchedResultsController] fetchedObjects] mutableCopy];


    for (int i=0; i<[[self xmppUserArray] count]; i++) {

        if ([[[[self xmppUserArray] objectAtIndex:i] valueForKey:@"sectionNum"] integerValue]==0) {
            //this is user is online
            [[[AKSGetCareerGlobalClass SharedInstance] onlineUserArray] addObject:[[[self xmppUserArray] objectAtIndex:i] valueForKey:@"nickname"]];

        }
    }


    [[self msgTableView] reloadData];

}



-(NSFetchedResultsController *)fetchedResultsController {
    if (fetchedResultsController == nil)
    {
        NSManagedObjectContext *moc = [[self appDelegate] managedObjectContext_roster];

        NSEntityDescription *entity = [NSEntityDescription entityForName:@"XMPPUserCoreDataStorageObject"
                                                  inManagedObjectContext:moc];

        NSSortDescriptor *sd1 = [[NSSortDescriptor alloc] initWithKey:@"sectionNum" ascending:YES];
        NSSortDescriptor *sd2 = [[NSSortDescriptor alloc] initWithKey:@"displayName" ascending:YES];

        NSArray *sortDescriptors = [NSArray arrayWithObjects:sd1, sd2, nil];
        //NSSortDescriptor *sd2 = [[NSSortDescriptor alloc] initWithKey:@"displayName" ascending:YES];

        //NSString *myJID = [[NSUserDefaults standardUserDefaults] stringForKey:@"userJID"];
        //NSLog(@"My JID ====>%@",myJID);

        NSPredicate *predicate = [NSPredicate predicateWithFormat:@"subscription=='both'"];//take care about subscription


        NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
        [fetchRequest setEntity:entity];
        [fetchRequest setPredicate:predicate];
        [fetchRequest setSortDescriptors:sortDescriptors];
        [fetchRequest setFetchBatchSize:20];

        fetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest
                                                                       managedObjectContext:moc
                                                                         sectionNameKeyPath:@"sectionNum"
                                                                                  cacheName:nil];
        [fetchedResultsController setDelegate:self];


        NSError *error = nil;
        if (![fetchedResultsController performFetch:&error])
        {
            DDLogError(@"Error performing fetch: %@", error);
        }

    }

    return fetchedResultsController;
}

【讨论】：

【解决方案2】：

使用服务器上的在线用户插件。这样就可以通过http获取在线用户了。

这是链接：https://github.com/candy-chat/onlineUsersPlugin

【讨论】：