delete tableViewCell on long press - ios

Question

I currently have a sidebar menu in an iOS 9.2 app running on Xcode 7.2 written in Swift 2 that allows the user what data to load to populate the view. I'm using SWRevealViewController to create that sidebar. I have a container view controller which has the front page and the sidebar page listing all the options the user has. Each time the user selects a cell from the sidebar table, it performs a segue that allows the front page to be refreshed. What I want to do is to allow the user to delete a cell from the table with a long press. I'd like to show an AlertViewController to confirm the user's decision, and if "Yes" is selected, I want to delete the cell, and select the very first item in the table. I've tried following the instructions from Long press on UITableView
but I keep getting the error "unrecognized selector sent to instance"
Here's the code that I'm using for setting up the gestureRecognizer in the cellForRowAtIndexPath function:
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as UITableViewCell;
cell.textLabel!.text = tableArray[indexPath.row];
let holdToDelete = UILongPressGestureRecognizer(target: cell, action: "longPressDelete");
holdToDelete.minimumPressDuration = 1.00;
cell.addGestureRecognizer(holdToDelete);
return cell;
}
And here's the longPressDelete function:
func longPressDelete(sender: UILongPressGestureRecognizer) {
let alert: UIAlertController = UIAlertController(title: "Please Confirm", message: "Are you sure you want to delete this car from your database?", preferredStyle: .Alert);
alert.addAction(UIAlertAction(title: "Yes", style: .Destructive, handler: { (UIAlertAction) -> Void in
if let tv = self.tableView {
let point: CGPoint = sender.locationInView(self.tableView);
let indexPath: NSIndexPath = self.tableView.indexPathForRowAtPoint(point)!;
tv.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade);
NSUserDefaults.standardUserDefaults().removeObjectForKey("fillUp" + tableArray[indexPath.row]);
NSUserDefaults.standardUserDefaults().removeObjectForKey("services" + tableArray[indexPath.row]);
tableArray.removeAtIndex(indexPath.row);
NSUserDefaults.standardUserDefaults().setObject(tableArray, forKey: "cars");
self.deleted = true;
self.performSegueWithIdentifier("tableToDashboard", sender: self);
}
}));
alert.addAction(UIAlertAction(title: "No", style: .Default, handler: nil));
self.presentViewController(alert, animated: true, completion: nil);
}
Here's the prepareForSegue function:
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if (deleted) {
let indexPath: NSIndexPath = NSIndexPath(forRow: 0, inSection: 0);
fillUpKey = "fillUp" + tableArray[indexPath.row];
servicesKey = "services" + tableArray[indexPath.row];
localFillUpArray = [fillUp]();
} else {
let indexPath: NSIndexPath = self.tableView.indexPathForSelectedRow!;
fillUpKey = "fillUp" + tableArray[indexPath.row];
servicesKey = "services" + tableArray[indexPath.row];
localFillUpArray = [fillUp]();
}
}
What I'd like to happen is that the user deletes the item in the cell, and the app then performs a segue to the front screen after loading the information from another source. Thanks for taking the time to read this and possibly provide an answer. I hope I haven't made a rookie mistake somewhere.

Answer 1

Incorrect Selector
let holdToDelete = UILongPressGestureRecognizer(target: self,
action: "longPressDelete:");
: after longPressDelete indicates that the method func longPressDelete(sender: UILongPressGestureRecognizer) actually accepts parameters.
self for target, assuming that the selector belongs to the same class that registered it.
The current selector "longPressDelete" would match a method signature without parameters:
func longPressDelete() { }

Answer 2

Very simple example if you want to select cell in uitableview
let longGesture = UILongPressGestureRecognizer(target: self, action: #selector(ViewController.longTap))
cell.addGestureRecognizer(longGesture)
// longTap
func longTap(gestureReconizer: UILongPressGestureRecognizer) {
print("Long tap")
let longPress = gestureReconizer as UILongPressGestureRecognizer
_ = longPress.state
let locationInView = longPress.location(in: tableview)
let indexPath = tableview.indexPathForRow(at: locationInView)
// whatever you want with indexPath use it //
}