如何接收花名册的存在信息以及花名册列表

Question

需要帮助获取好友的状态信息。

我正在调用"fetchRoster"函数，但是我正在获取花名册列表，而不是存在信息。

我也试着调用一个显式的状态信息。但是didRecievePresence委托在我的iOS应用中没有被调用。

问候,Cbhat

Answer 1

From Robbiehanson的XMPPFramework - RootViewController类:

1. 取花名册

   - (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);
           }
       }
       return fetchedResultsController;
   }
   

2. 每当在服务器中记录到用户存在的更改时，重新加载您的表

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

3. 显示头像(头像)

   - (void)configurePhotoForCell:(UITableViewCell *)cell user:(XMPPUserCoreDataStorageObject *)user
   {
       // Our xmppRosterStorage will cache photos as they arrive from the xmppvCardAvatarModule.
       // We only need to ask the avatar module for a photo, if the roster doesn't have it.
       if (user.photo != nil)
       {
           cell.imageView.image = user.photo;
       } 
       else
       {
           NSData *photoData = [[[self appDelegate] xmppvCardAvatarModule] photoDataForJID:user.jid];
           if (photoData != nil)
               cell.imageView.image = [UIImage imageWithData:photoData];
           else
               cell.imageView.image = [UIImage imageNamed:@"defaultPerson"];
       }
   }
   

4. 将表格分成两部分—可用/离线

   - (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 @"";
   }
   

5. 用用户的显示名显示你的整个花名册

   - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
   {
       static NSString *CellIdentifier = @"Cell";
       UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
       if (cell == nil)
       {
           cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
                                          reuseIdentifier:CellIdentifier];
       }
       XMPPUserCoreDataStorageObject *user = [[self fetchedResultsController] objectAtIndexPath:indexPath];
       cell.textLabel.text = user.displayName;
       [self configurePhotoForCell:cell user:user];
       return cell;
   }
   

这包含在您下载的XMPPFramework中。尝试一下。我说的这5点可能就是你需要的。