我正在获取在线/离线用户。这样如果我需要检查我必须每次发送请求以获得存在
我如何检查多个用户或仅在线用户?
最佳答案
I have implement NSFetchedResultsControllerDelegate. i am getting list of Online user in "SectionNum"=0. whenever user goes offline/online controller's delegate method called.accordingly update tableView.
//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;
}
关于ios - 如何在 iOS 的 openfire/xmpp 中获取所有在线用户的列表?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/25803196/