Question

I am trying to build a multilayer xmlparser which shows data in a tableview and switches to the next view based on the selected row (most likely to the same viewcontroller).

I started with storyboard segues but as i am using dynamic cells i dont know how to create more than one push segue (because it needs to push to various viewcontrollers). So i kept the storyboard views, deleted all the segues and used the code below instead.

however it throws this exception when the new view tries to pupulate the row:

Terminating app due to uncaught exception
‘NSInternalInconsistencyException’, reason: ‘UITableView dataSource
must return a cell from tableView:cellForRowAtIndexPath:’

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSLog(@"index: %i", indexPath.row);

    switch (indexPath.row) {
        case 0:
        {
            DetailViewController *detailViewController = [DetailViewController alloc];
            [self.navigationController pushViewController:detailViewController animated:YES];
            break;
        }
        //...
        default:
        {
            LayerViewController *layerViewController= [LayerViewController alloc];
            [layerViewController setStartUpWithIndex:indexPath.row andLayer:layercount];
            [self.navigationController pushViewController:layerViewController animated:YES];
            break;
        }


    }

}

setStartUpWithIndex:andLayer: is my init method…

the problem does not occur when im pushing via storyboard segue with the following segue code:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
        NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
        [[segue destinationViewController] setStartUpWithIndex:indexPath.row andLayer:layercount];
}

i think i am missing something the “segue” method does which i need to include in my didSelectRowAtIndexPath as cellForRowAtIndexPath: works fine in the first layer of the view.

requested edit:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"LayerCell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    cell.textLabel.text = [[articles objectAtIndex:indexPath.row]objectForKey:@"HerstellerName"];
//    cell.textLabel.text = @"ololol";

    return cell;
}

the articles array is working btw

Answer 1

You aren’t creating any cells. I don’t know why Apple didn’t include this in the default implementation, but after:

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

You need to add:

if (cell==nil){
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}

Otherwise you’re just relying on dequeued cells which won’t exist when the tableView loads.

Edit: And if you’re not using ARC, you need to wrap that alloc method with an autorelease.