I'm creating a list by UICollectionView with auto layout, I followed this answer and it worked fine until I add an expandable behavior.
I made a very simple project as you can see the screenshot above, all cells (red cells) are clickable, each cell contains a vertical stack view with two labels, title and description, the description label is hidden by default.
When a cell is selected, the description's hidden value will be changed, then I will call reloadItems(at:) to expand/fold the selected cell.
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
if let cell = collectionView.cellForItem(at: indexPath) as? DynamicCollectionViewCell {
let dm = dataModels[indexPath.section][indexPath.item]
dm.isExpanded = !dm.isExpanded
cell.descLabel.isHidden = !dm.isExpanded
cell.indicatorLabel.text = dm.isExpanded ? "-" : "+"
collectionView.reloadItems(at: [indexPath])
}
}
Suddenly the second header's position is moved! I've tried to use reloadData instead but the contentSet will be reset to 0. Why this could happen and how can I fix it?
