I'm trying to use a swipe delete function to remove tableview cells. It works fine, except when I have only 1 cell remaining. If I delete the last cell, I get the titular error message. What's going wrong here? It seems to be an internal logic error, but I'm deleting the item from my array before the row is deleted, so shouldn't the row reflect that? Thanks in advance!
Here's some setup:
private var resultArray: [SavedResult] = []
private var decodedData = [SavedResult]()
@IBOutlet weak var resultsTableView: UITableView!
var resultLabel = "none"
override func viewDidLoad() {
super.viewDidLoad()
self.resultsTableView.delegate = self
resultsTableView.dataSource = self
resultsTableView.rowHeight = 80.0
loadCellName()
}
func loadCellName() {
resultArray = []
if let data = try? Data(contentsOf: filePath!) {
let decoder = PropertyListDecoder()
do {
decodedData = try decoder.decode([SavedResult].self, from: data)
} catch {
print("There was an error loading data: \(error)")
}
}
resultArray = decodedData
self.resultsTableView.reloadData()
}
and here's all my tableview/data source/swipe stuff:
extension SavedViewController: UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if resultArray.count == 0 {
return 1
} else {
return resultArray.count
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = resultsTableView.dequeueReusableCell(withIdentifier: "ResultCell", for: indexPath) as! SwipeTableViewCell
cell.delegate = self
if resultArray.count == 0 {
cell.textLabel?.text = "No Saved Results Yet."
cell.textLabel?.attributedText = NSAttributedString(string: (cell.textLabel?.text)!, attributes: [NSAttributedString.Key.font : UIFont(name: "Caveat", size: 30.0)])
cell.backgroundColor = blueCell
cell.accessoryType = .none
cell.isUserInteractionEnabled = false
return cell
} else {
cell.textLabel?.text = resultArray[indexPath.row].name
cell.textLabel?.attributedText = NSAttributedString(string: (cell.textLabel?.text)!, attributes: [NSAttributedString.Key.font : UIFont(name: "Caveat", size: 30.0)])
switch indexPath.row {
case 0, 3, 6, 9, 12, 15, 18, 21, 24, 27:
cell.backgroundColor = blueCell
case 1, 4, 7, 10, 13, 16, 19, 22, 25:
cell.backgroundColor = yellowCell
case 2, 5, 8, 11, 14, 17, 20, 23:
cell.backgroundColor = purpleCell
default:
fatalError("cell background colour setting failed.")
}
return cell
}
}
}
extension SavedViewController: UITableViewDelegate {
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
resultLabel = resultArray[indexPath.row].resultMessage
resultsTableView.deselectRow(at: indexPath, animated: true)
self.performSegue(withIdentifier: "savedExamSeg", sender: self)
}
}
extension SavedViewController: SwipeTableViewCellDelegate {
func tableView(_ tableView: UITableView, editActionsForRowAt indexPath: IndexPath, for orientation: SwipeActionsOrientation) -> [SwipeAction]? {
guard orientation == .right else { return nil }
let deleteAction = SwipeAction(style: .destructive, title: "Delete") { action, indexPath in
self.resultArray.remove(at: indexPath.row)
let encoder = PropertyListEncoder()
do {
let data = try encoder.encode(self.resultArray)
try data.write(to: self.filePath!)
} catch {
print("There was an error saving data: \(error)")
}
}
deleteAction.image = UIImage(named: "deleteIcon")
return [deleteAction]
}
func tableView(_ tableView: UITableView, editActionsOptionsForRowAt indexPath: IndexPath, for orientation: SwipeActionsOrientation) -> SwipeOptions {
var options = SwipeTableOptions()
options.expansionStyle = .destructive
return options
}
