Nil data is passed from tableview detail disclosure with prepareForSegue - ios

Question

I need to pass a string with prepareForSegue from a tableView disclosure link. Here is the prepareForSegue code I use. This is the code I found in several cases when other users needed to do the same thing, but in my case it doesn't work. Problem is with indexPathForSelectedRow() that is nil:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
if segue.identifier == "alertsDetail" {
let detailAlertViewController = segue.destinationViewController as DetailAlertViewController
println(alertTable.indexPathForSelectedRow()) // NIL
if let indexPath = alertTable.indexPathForSelectedRow() {
let entryToPass = unpublishedPhotosObjectId[indexPath.row]
detailAlertViewController.entryId = entryToPass
}
}
}
I named the tableView "alertTable" and not self because the tableview is not a view controller, just a view.
In case needed, here is tableview code:
#IBOutlet weak var alertTable: UITableView!
/////////////TableView - START
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return unpublishedPhotos.count
}
func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
return 170
}
func tableView(tableView: UITableView!, cellForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCell! {
tableView.separatorColor = UIColor.clearColor()
let cell = tableView.dequeueReusableCellWithIdentifier("adminAlertsCell") as? adminAlertsCell
var data = unpublishedPhotos[indexPath.row].getData()
let image = UIImage(data: data)
cell!.myImageInCell.image = image
return cell
}
func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
// Add access to cell
let cell = tableView.cellForRowAtIndexPath(indexPath) as? adminAlertsCell
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic)
println(cell!.banSwitch.on)
}
}
/////////////TableView - END

Answer 1

You should make the segue from the controller instead of directly from the detail disclosure button. Implement the method,
tableView:accessoryButtonTappedForRowWithIndexPath: and call performSegueWithIdentifier:sender: from inside that method. Pass the in-depth as the sender argument so you have access to that in prepareForSegue,
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!) {
let indexPath = sender as NSIndexPath
if segue.identifier == "alertsDetail" {
let detailAlertViewController = segue.destinationViewController as DetailAlertViewController
let entryToPass = unpublishedPhotosObjectId[indexPath.row]
detailAlertViewController.entryId = entryToPass
}
}

Answer 2

Your issue is stated in the comments to your question, and there are several solutions. Perhaps the quickest since you only have one section, is to assign the indexPath.row to the tag of the cell. Then in your prepare for segue, the sender will be your cell. You can get the value out of it. So in your cellForRow method before your return your cell:
cell!.tag = indexPath.row
Then in your prepareForSegue:
let cell = sender as? adminAlertsCell
println(cell!.tag)
Here I am just printing it, but you can use it to pass the row.