Reusable UITableViewCell with UICollectionViewCell - ios

Question

Code:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
registerCells()
guard let cell = tableView.dequeueReusableCell(withIdentifier: cellReuseIdentifierForItem(at: indexPath.row), for: indexPath) as? HorizontalCollectionTableViewCell else {
return UITableViewCell()
}
if cellViewModels.count > indexPath.row {
let viewModel = cellViewModels[indexPath.row]
cell.viewModel = viewModel
}
return cell
}
Passing viewModel to Cell:
var viewModel: TitleAccessoryButtonCollectionViewModel? {
didSet {
guard let viewModel = viewModel else {
return
}
titleLabel.text = viewModel.title
if let buttonTitle = viewModel.accessoryButtonModel?.title {
setAccessoryButtonTitle(buttonTitle)
}else{
accessoryButton.hideTitleLabel()
}
if let buttonImage = viewModel.accessoryButtonModel?.image {
accessoryButton.buttonImageView.image = buttonImage
}
else {
accessoryButton.hideImageView()
}
sectionContentImage.image = viewModel.sectionContentImage
titleLabelLeadingConstraint.constant = viewModel.titleLabelLeadingSpacing
accessoryButton.isHidden = viewModel.hideAccessoryButton
sectionContentView.isHidden = viewModel.hidePremiumContentView
let collectionViewModel = viewModel.collectionViewModel
collectionViewHeight.constant = CGFloat(collectionViewModel.height)
collectionViewModel.setup(collectionView: collectionView)
collectionView.delegate = collectionViewModel.delegate
collectionView.dataSource = collectionViewModel.dataSource
collectionView.reloadData()
}
}
Description:
I have six UITableViewCell mostly, and they are reusable.
In every UITableViewCell is UICollectionView.
Five UICollectionView's use normal UICollectionViewFlowLayout's, but one needs a custom subclass.
The problem is that when UITableViewCell with custom UICollectionViewFlowLayout is hiding and new UITableViewCell is showing and cell with this custom flow layout is reused and UICollectionView already have UICollectionViewFlowLayout but is bad.
Is any nice way to clear this layout or prevent this situation?
Maybe something with prepareForReuse()?
I add that UICollectionView is outlet in UITableViewCell.

Answer 1

This excellent article helped me a lot to get UICollectionViews in UITableviewCells up and running: https://ashfurrow.com/blog/putting-a-uicollectionview-in-a-uitableviewcell-in-swift/
To update the layout you can call
collectionView.collectionViewLayout.invalidateLayout()
See also:
Swift: How to refresh UICollectionView layout after rotation of the device