Dear list,
I'm trying to construct a UITableViewCell with what is essentially a disclosure
triangle on it. When that's tapped, the cell expands to show additional
information. I currently hack this with code along these lines:
NSArray *cellPaths = [tableView indexPathsForVisibleRows];
[UIView animateWithDuration:0.3
animations:^ ()
{
MyCustomCell *cell = [tableView cellForRowAtIndexPath:indexPath];
NSUInteger minRow = [indexPath row];
BOOL d = ![cell disclosed];
[cell setDisclosed:d];
[disclosures setObject:[NSNumber numberWithBool:d] forKey:[cell
statName]];
for (NSIndexPath *p in cellPaths)
{
if ([p row] > minRow)
{
MyCustomCell *c = [tableView cellForRowAtIndexPath:p]
[c setFrame:CGRectMake([c frame].origin.x, d ? [c
frame].origin.y + kDisclosureOffset : [c frame].origin.y - kDisclosureOffset,
[c frame].size.width, [c frame].size.height)];
}
}
}
completion:^ (BOOL finished)
{
[tableView reloadRowsAtIndexPaths:cellPaths
withRowAnimation:UITableViewRowAnimationNone];
}];
This for the most part works well except for one case – collapsing the cells.
When this happens, the table view does not have cells for the rows that are not
yet visible, but become visible as the cell collapses. Because of this, a
blank area comes into view at the bottom of the table view, and then flashes as
it gets replaced by the newly generated rows.
I've tried using cellForRowAtIndexPath: to grab the cells off the bottom, but
these come back as nil, as the table view doesn't think it needs to show them.
The only other thing I can conjor in my mind is to call something similar to
the data source method directly to construct cells myself, add them to the TV,
animate them in, remove them and reload the table view. However, this does not
solve one final issue – what happens when the table view is scrolled near to
the bottom and there are no cells to add.
If anyone could recommend a good way forward here, I'd be appreciative.
Thanks
Tom Davie
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