No index path for table cell being reused

Question

This started to happen out of the blue. Any ideas: Code:

CUSTOMCLASSNAME (I have replaced the actual class name as it contains the name of the client.)

Initialising my tableView:

[self.tableView registerClass:[CUSTOMCLASSNAME class] forCellReuseIdentifier:[self reuseIdentifier]];

In cell for row:

Hi, the title is being printed in the console. This is my cellForRow:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    AVTCheckListTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:[self reuseIdentifier] forIndexPath:indexPath];

    [self configureCell:cell atIndexPath:indexPath];

    return cell;
}

- (void)configureCell:(AVTCheckListTableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath {
    ChecklistGroup *group = [self.checklistFetchedResultsController.fetchedObjects objectAtIndex:indexPath.section];

    ChecklistItem *item = [self getChecklistItemForIndexPath:indexPath];

    [cell setSelectionStyle:UITableViewCellSelectionStyleNone];
    [[cell cellTextView] setAttributedText:[[item checked] boolValue] ? [[NSAttributedString alloc] initWithString:[item name] attributes:@{ NSStrikethroughStyleAttributeName : @(NSUnderlineStyleSingle) } ] : [[NSAttributedString alloc] initWithString:[item name]]];
    [[cell cellTextView] setUserInteractionEnabled:[[group isUserDefined] boolValue]];
    [[cell cellTextView] setTag:indexPath.row];
    [[cell cellTextView] setDelegate:self];
    [[cell tickImage] setHidden:![[item checked] boolValue]];
}

//Method that returns re-use:

- (NSString *) reuseIdentifier {
    return @"CheckListTableView";
}

Solution 1

I worked this out after a few days. In my custom cell I had a textView, when I was adding it to the contentView I was doing this:

[self.cellTextView setClearsOnInsertion:YES];

This was the cause of the issue; incase anyone else has a similar problem.

Happy coding :-)

Solution 2

Return [cell contentView] instead of cell from tableView:viewForHeaderInSection:

EDIT: This somehow led to crashes on long-press gestures on UI Buttons. To fix that, I gave up and used another section with a single item as a fake section header.

Solution 3

I found this warning during my viewForHeaderInSection implementation.

This is my solution in Swift 2.x:

let headerView = self.tableView.dequeueReusableCellWithIdentifier("MyCell") as! MyCell
let containerView = UIView(frame:headerView.frame)
headerView.autoresizingMask = [.FlexibleWidth, .FlexibleHeight]
headerView.myLabel.text = "section title 1"
containerView.addSubview(headerView)
return containerView

This is the Swift 3 version:

let headerView = self.tableView.dequeueReusableCell(withIdentifier: "MyCell") as! MyCell
let containerView = UIView(frame:headerView.frame)
headerView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
headerView.myLabel.text = "section title 1"
containerView.addSubview(headerView)
return containerView

Solution 4

I have just tracked down a cause of this error message.

A UITableViewCell was being used as a normal view. Therefore its' indexPath was not set. In our case one was being returned by viewForHeaderInSection:

Hope this helps.

Chris

Solution 5

In my case, this error was presented only on iPhone (not iPad) because I had placed [self.tableView beginUpdates]; and later [self.tableView endUpdates]; inside [UIView transitionWithView:duration:options:animations:compeletion];. To fix, I just removed begin/end updates, as I preferred a fading animation instead of fading plus animating cell height changes.

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