Question

我正在使用Apple的CoreDataBooks示例项目，我希望在tableview中的indexPath 0上有一个自定义单元格，然后从索引1开始获取我的核心数据结果。

我尝试了一些不同的解决方案，但无法使其正常运行，如果您有任何想法，我们将非常感谢。

如果你想知道我尝试过但失败了，请告诉我。我想要实现的目标看起来很简单，只需在单元格1而不是0开始获取结果。

编辑2：

我的所有UITableViewDataSource和configureGuestCell代码：

    - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
    {    
        if (indexPath.row == 0) 
        {
            static NSString *CellIdentifier = @"statsCell";

            GuestStatsCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
            if (cell == nil) 
            {
                cell = [[GuestStatsCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
            }

            //Configure the cell.
            [self configureStatsCell:cell];

            return cell;
        }
        if (indexPath.row > 0)
        {
            static NSString *CellIdentifier = @"guestCell";

            customGuestCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
            if (cell == nil) 
            {
                cell = [[customGuestCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
            }

            // Configure the cell.
            [self configureGuestCell:cell atIndexPath:indexPath];

            return cell;
        }
    }


- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    int cellHeight;

    if (indexPath.row == 0) 
    {
        cellHeight = 240;
    }
    else
    {
        cellHeight = 44;
    }

    return cellHeight;
}


- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView 
{
    return [[fetchedResultsController sections] count];
}


// Customize the number of rows in the table view.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
{
    id <NSFetchedResultsSectionInfo> sectionInfo = [[fetchedResultsController sections] objectAtIndex:section];
    return [sectionInfo numberOfObjects];
}

- (void)configureGuestCell:(customGuestCell *)cell atIndexPath:(NSIndexPath *)indexPath 
{
    //Configure the cell to show the Guests first and last name and other details
    GuestInfo *guest = [fetchedResultsController objectAtIndexPath:indexPath];

    cell.guestNameLbl.text = [NSString stringWithFormat:@"%@ %@", guest.firstName, guest.lastName];

}


- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath 
{

    if (editingStyle == UITableViewCellEditingStyleDelete) 
    {

        // Delete the managed object.
        NSManagedObjectContext *context = [fetchedResultsController managedObjectContext];
        [context deleteObject:[fetchedResultsController objectAtIndexPath:indexPath]];

        NSError *error;
        if (![context save:&error]) 
        {
            // Update to handle the error appropriately.
            NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
            exit(-1);  // Fail
        }
    }   
}


- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath 
{
    // Create and push a detail view controller.
    guestListDetailViewController *detailViewController = [[guestListDetailViewController alloc] initWithStyle:UITableViewStyleGrouped];
    GuestInfo *selectedGuest = (GuestInfo *)[[self fetchedResultsController] objectAtIndexPath:indexPath];
    // Pass the selected book to the new view controller.
    detailViewController.guest = selectedGuest;
    [self.navigationController pushViewController:detailViewController animated:YES];
}

Answer 1

固定代码：

// Customize the number of rows in the table view.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
{
    id <NSFetchedResultsSectionInfo> sectionInfo = [[fetchedResultsController sections] objectAtIndex:section];
    return [sectionInfo numberOfObjects] +1;
}

- (void)configureGuestCell:(customGuestCell *)cell atIndexPath:(NSIndexPath *)indexPath 
{
    NSIndexPath *path = [NSIndexPath indexPathForRow:(indexPath.row - 1) inSection:indexPath.section]
    //Configure the cell to show the Guests first and last name and other details
    GuestInfo *guest = [fetchedResultsController objectAtIndexPath:path];

    cell.guestNameLbl.text = [NSString stringWithFormat:@"%@ %@", guest.firstName, guest.lastName];

}

小解释：
你应该在numberOfRowsInSection中多返一行，但为了防止错误，在调用[NSFetchedResultsController objectAtIndexPath]之前应该减少行号。

Answer 2

将1添加到indexPath.row值....？！

Answer 3

为此，您还需要编辑-tableView: numberOfRowsInSection:以返回（realRows + 1）。

同样，每当您引用NSFetchedResultsController |时，您都希望减少一行。我怀疑NSArray

中的configureCell:atIndexPath:

您希望/需要触摸数据源的任何地方，您需要通过递增或递减来调整该行。

对OP

的回应

不要更改NSIndexPath，没有必要。调整-configureCell: atIndexPath:或其他任何接触该索引值的索引：

-(void)configureCell:(id)cell atIndexPath:(NSIndexPath*)indexPath
{
  NSInteger finalIndex = [indexPath row] - 1;
  NSIndexPath *newPath = [NSIndexPath indexPathForRow:finalIndex inSection:[indexPath section]];
  id object = [[self myNSFRC] objectAtIndexPath:newPath];
  //Continue configuring your cell
}

显然，如果您使用的是阵列，请不要费心去创建新的NSIndexPath。

CoreDataBooks示例 - 在索引1处启动单元格？

3 个答案:

对OP