IOS XMPP 如何使用特定的用户名和聊天进入下一个控制器

Question

我正在从事 XMPP 项目。我已成功完成登录过程和在线离线花名册。但现在我不知道如何转到具有特定用户字段的下一个视图控制器并与他聊天。这是我的尝试。 现在我必须在 UITableview 的委托方法中编写什么

friendsviewcontroller.m file // Fetch online and offline rosterlist

  #pragma mark -Tableview datasource method
 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
 {
    return [[[self fetchedResultsController] sections] count];
}
    - (CGFloat)tableView:(UITableView *)aTableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
switch (indexPath.row){
    case 0:
        if(indexPath.section==0)
            return 60.0; // first row is 123pt high
    default:
        return 60.0; // all other rows are 40pt high
 }
 }
   - (NSString *)tableView:(UITableView *)sender titleForHeaderInSection:(NSInteger)sectionIndex
{
NSArray *sections = [[self fetchedResultsController] sections];
   if (sectionIndex < [sections count])
{
    id <NSFetchedResultsSectionInfo> sectionInfo = [sections objectAtIndex:sectionIndex];
    int section = [sectionInfo.name intValue];
    switch (section)
    {
        case 0  : return @"Available";
        case 1  : return @"Away";
        default : return @"Offline";
    }
}
 return @"";}
   - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)sectionIndex{
NSArray *sections = [[self fetchedResultsController] sections];

if (sectionIndex < [sections count])
 {
     id <NSFetchedResultsSectionInfo> sectionInfo = sections[sectionIndex];
     return sectionInfo.numberOfObjects;
 }
return 0;}
     - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
     {
  static NSString *simpleTableIdentifier = @"SimpleTableItem";
   UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
 if( cell == nil){
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:simpleTableIdentifier];
    }
    XMPPUserCoreDataStorageObject *user = [[self fetchedResultsController] objectAtIndexPath:indexPath];
        cell.textLabel.text = user.displayName;
            [self configurePhotoForCell:cell user:user];
   // cell.detailTextLabel.text= [self.tblchathistory objectAtIndex:indexPath.row];
    cell.textLabel.textColor=[UIColor whiteColor];
    return cell;
   }
   #pragma Mark - segue method
  - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
    {
     if ([[segue identifier] isEqualToString:@"chathistory"])
    {
   CreateGroupViewController *vc = [segue destinationViewController];
    }
  }
  - (BOOL)xmppStream:(XMPPStream *)sender didReceiveIQ:(XMPPIQ *)iq
{
NSXMLElement *queryElement = [iq elementForName: @"query" xmlns: @"jabber:iq:roster"];
if (queryElement)
{
    NSArray *itemElements = [queryElement elementsForName: @"item"];
    for (int i=0; i<[itemElements count]; i++)
    {
        NSLog(@"Friend: %@",[[itemElements[i] attributeForName:@"jid"]stringValue]);
        }
}
return NO;
}
 - (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];

    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    [fetchRequest setEntity:entity];
    [fetchRequest setSortDescriptors:sortDescriptors];
    [fetchRequest setFetchBatchSize:10];

    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);
        //NSLog(@"error = %@", error);
    }
}

return fetchedResultsController;
 }

- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller
{
[[self tblvwbuddy] reloadData];
 }

Answer 1

您可以通过以下方式获取用户当您在一个屏幕上显示时，这意味着您拥有用户的 jid，因此获取该用户的 jid 并在下一个控制器中您可以过滤用户。这是我的代码，用于通过 jid 从 XMPPUserCoreDataStorageObject 中过滤特定用户。在我的例子中 friendJid 是要过滤的 jid

- (XMPPUserCoreDataStorageObject *)fetchTheUser
{
    NSManagedObjectContext *moc = [APP_DELEGATE managedObjectContext_roster];

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

    NSPredicate *pred = [NSPredicate predicateWithFormat:@"jidStr=%@",[self.friendJid lowercaseString]];
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    [fetchRequest setEntity:entity];
    [fetchRequest setPredicate:pred];

    NSError *error = nil;

    [fetchRequest setPredicate:pred];
    NSArray *fetchedObjects = [[APP_DELEGATE managedObjectContext_roster] executeFetchRequest:fetchRequest error:&error];

    XMPPUserCoreDataStorageObject *objTemp = fetchedObjects.count?[fetchedObjects objectAtIndex:0]:nil;

    return objTemp;
}

希望对您有所帮助。觉得有用就采纳吧

IOS XMPP 如何使用特定的用户名和聊天进入下一个控制器

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objective-c

ios