didDeselectRowAtIndexPath indexPath is nil

Question

I have a TableViewController which implements the TableViewDelegate methods:

public override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
    let cell = tableView.cellForRowAtIndexPath(indexPath) as! ParticipantesSearchTableViewCell
    cell.viewModel?.active = true
}

public override func tableView(tableView: UITableView, didDeselectRowAtIndexPath indexPath: NSIndexPath) {
    let cell = tableView.cellForRowAtIndexPath(indexPath) as! ParticipantesSearchTableViewCell
    cell.selectedStateImageView.hidden = true
    cell.viewModel?.active = false
}

Please note that I never remove nor set my tableView.editing to true. Also, my numberOfRowsInSection method never changes.

If I set my tableView to tableView.allowsSingleSelection = true I can select and deselect cells just fine and the above methods fire as aspected. However, when I scroll on my tableView and select a new cell the method didDeselectRowAtIndexPath crashes on let cell = tableView.cellForRowAtIndexPath(indexPath) as! ParticipantesSearchTableViewCell

At this point I debugged tableView.indexPathForSelectedRow and it returns nil.

Any idea what I'm implementing wrong here or if this is a bug? Because I try to use the same table with tableView.allowsMultipleSelection = true and I can select, deselect, and scroll just fine.

Almeta

Verify that indexPath (not tableView.indexPathForSelectedRow) in didDeselectRowAtIndexPath is non-nil. It's also possible the forced downcast to ParticipantesSearchTableViewCell is causing the crash. – Burnsides

The thing is that the cell may not be visible and cells are reused. So it may be nil. Clearly, you should change the datasource, and in tableView:cellForRowAtIndexPath: hide/unhide the imageView, or just override also the ParticipantesSearchTableViewCell select method to show/hide the image. – Laquanda

Try printing indexPath. Maybe the table is nil. IndexPath is not an optional; it cannot be nil – Lifeboat

This confusion had a lot to do with my understanding of how selection in a tableview worked. I followed @Laquanda advice and change my viewModel layer. Thanks a lot to everyone who helped – Almeta