Swipe to delete rows with multi section in tableview? - ios

Question

I have a table view with two sections
I added the swipe to delete row
but the app crash cause there's error select the current indexPath
I tried two different ways but none of this works
//the code
func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
let contextItem = UIContextualAction(style: .destructive, title: "Delete") { (contextualAction, view, boolValue) in
switch indexPath.section{
case 0:
//1 i tried this
self.tableView.deleteRows(at: [indexPath], with: .automatic)
case 1:
//2 and i tried this
self.tableView.deleteRows(at: [IndexPath(row: indexPath.row, section: 1)], with: .automatic)
default:break
}
boolValue(true)
}
let swipeActions = UISwipeActionsConfiguration(actions: [contextItem])
return swipeActions
}
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
the result says: "Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of rows in section 1. The number of rows contained in an existing section after the update (5) must be equal to the number of rows contained in that section before the update (5), plus or minus the number of rows inserted or deleted from that section (0 inserted, 1 deleted) and plus or minus the number of rows moved into or out of that section (0 moved in, 0 moved out).'"

Answer 1

Terminating app due to uncaught exception
'NSInternalInconsistencyException', reason: 'Invalid update: invalid
number of rows in section 1. The number of rows contained in an
existing section after the update (5) must be equal to the number of
rows contained in that section before the update (5), plus or minus
the number of rows inserted or deleted from that section (0 inserted,
1 deleted) and plus or minus the number of rows moved into or out of
that section (0 moved in, 0 moved out).'
It says the exact thing you gotta do. Remember when deleting data, you need to make your DATASOURCE count equal to the rows and section count after the method deleteRows or deleteSections.
Which means you manipulate your data source array before calling those methods. And when using multi-sections, remember to carefully access your datasource by both section and row, and also when deleting and inserting data.
func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
let contextItem = UIContextualAction(style: .destructive, title: "Delete") { (contextualAction, view, boolValue) in
let section = indexPath.section
let row = indexPath.row
self.data[section].remove(at: row)
self.tableView.deleteRows(at: [indexPath], with: .automatic)
boolValue(true)
}
let swipeActions = UISwipeActionsConfiguration(actions: [contextItem])
return swipeActions
}