Crash when using ASTableNode convert(_ rect:,from:) with ASCellNode method

[siuying]

I tried to retrieve the frame of an ASCellNode within its container ASTableNode. I need this to animate transition of the cell to next screen.

When I called tableNode.convert(cell.frame, from: cell), I expected to return the cell frame in the table coordinate. instead I get error: Could not find a common ancestor between node1: <MyCellNode: 0x7fee331bb000> and node2: <ASTableNode: 0x7fee32e0d5d0>

This is weird, can a table node not the ancestor of a cell node?

This can be reproduced by adding two lines to AsyncDisplayKit/examples/ASViewControllerSample/ViewController.m

- (void)tableNode:(ASTableNode *)tableNode didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    // add these two lines to get the Rect of the cell node... 
    // it will crash the app when user tap a row
    ASCellNode* cell = [tableNode nodeForRowAtIndexPath:indexPath];
    CGRect rect = [tableNode convertRect:cell.frame fromNode:cell];

    NSString *imageCategory = self.imageCategories[indexPath.row];
    DetailRootNode *detailRootNode = [[DetailRootNode alloc] initWithImageCategory:imageCategory];
    DetailViewController *detailViewController = [[DetailViewController alloc] initWithNode:detailRootNode];
    detailViewController.title = [imageCategory capitalizedString];
    [self.navigationController pushViewController:detailViewController animated:YES];
}

[Adlai-Holler]

@siuying Ah that makes sense – the cell node is not a direct subnode of the table node. The cell node is inside a view (the UITableViewCell) which is inside the table view.

Instead use -[ASTableNode rectForRowAtIndexPath:] to get the rect in the table node's coordinate system. Thanks for raising the issue and sorry for the confusion!

[siuying]

Thanks a lot for the pointer!