viewWillAppear not calling didDeselectRowAt - ios

Question

I currently have a tableView which I've created custom selection and deselection actions for (fade in and out a view). I am facing a problem where on unwind back to the tableView the deselect action isn't being called. I have added the necessary deselect code to my viewWillAppear so can't seem to work out what could be going wrong. Is there a different method for this use-case?
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
//Deselect row on unwind
if let path = folderTableView.indexPathForSelectedRow {
folderTableView.deselectRow(at: path, animated: true)
}
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
print("Select")
switch indexPath.section {
case 2:
let cell = tableView.cellForRow(at: indexPath) as! FolderTagTableViewCell
cell.folderTagSelectionBKG.alpha = 1.0
default:
let cell = tableView.cellForRow(at: indexPath) as! FolderTableViewCell
cell.folderSelectionBKG.alpha = 1.0
}
}
func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
print("Should deselect")
switch indexPath.section {
case 2:
let cell = tableView.cellForRow(at: indexPath) as! FolderTagTableViewCell
UIView.animate(withDuration: 0.2, delay: 0.0, options: .curveEaseInOut, animations: {
cell.folderTagSelectionBKG.alpha = 0
})
default:
let cell = tableView.cellForRow(at: indexPath) as! FolderTableViewCell
UIView.animate(withDuration: 0.2, delay: 0.0, options: .curveEaseInOut, animations: {
cell.folderSelectionBKG.alpha = 0
})
}
}

Answer 1

From the documentation of deselectRow(at:animated:)
Calling this method does not cause the delegate to receive a tableView(_:willDeselectRowAt:) or tableView(_:didDeselectRowAt:) message, nor does it send selectionDidChangeNotification notifications to observers.
Calling this method does not cause any scrolling to the deselected row.
A solution is to move the code in didDeselectRowAt into an extra method
func deselectRowAnimated(at indexPath : IndexPath)
{
switch indexPath.section {
case 2:
let cell = tableView.cellForRow(at: indexPath) as! FolderTagTableViewCell
UIView.animate(withDuration: 0.2, delay: 0.0, options: .curveEaseInOut, animations: {
cell.folderTagSelectionBKG.alpha = 0
})
default:
let cell = tableView.cellForRow(at: indexPath) as! FolderTableViewCell
UIView.animate(withDuration: 0.2, delay: 0.0, options: .curveEaseInOut, animations: {
cell.folderSelectionBKG.alpha = 0
})
}
}
and call it in viewWillAppear and didDeleselect
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
//Deselect row on unwind
if let indexPath = folderTableView.indexPathForSelectedRow {
deselectRowAnimated(at: indexPath)
}
}
...
func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
deselectRowAnimated(at: indexPath)
}
selectrow

Answer 2

If you using UITableViewController subclass then just set property
self.clearsSelectionOnViewWillAppear = YES;
else on viewDidAppear just call
NSIndexPath *indexPath = self.tableView.indexPathForSelectedRow;
if (indexPath) {
[self.tableView deselectRowAtIndexPath:indexPath animated:animated];
}
// MARK: - Swift 3
if let indexPath = tableView.indexPathForSelectedRow {
tableView.deselectRow(at: indexPath, animated: true)
}
How to unselect a uitableview cell when the user returns to the view controller

Answer 3

From your tableView unwind action, try to put your deselect code. Like this:
#IBAction func <UnwindName>(segue : UIStoryboardSegue) {
if let indexPath = tableView.indexPathForSelectedRow {
tableView.deselectRow(at: indexPath, animated: true)
}
}