I put a breakpoint before the editing style function and then stepped through the code as it executes. It executes to DispatchQueue statement and then does not execute the if statement.
I tried selecting the second row and selecting the row I added before deleting. Neither made a difference.
This is the complete code.
// Define class.
class MasterViewController: UITableViewController {
var detailViewController: DetailViewController? = nil
var objects = [Any]()
var selectedItem = IndexPath(row: 0, section: 0)
var deadsticks = [DeadStick]()
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.leftBarButtonItem = editButtonItem
if let split = splitViewController {
let controllers = split.viewControllers
detailViewController = (controllers[controllers.count-1] as! UINavigationController).topViewController as? DetailViewController
}
if let savedDeadSticks = DeadStick.loadDeadSticks() {
deadsticks = savedDeadSticks
} else {
deadsticks = DeadStick.loadSampleDeadSticks()
}
self.tableView.selectRow(at: selectedItem, animated: true, scrollPosition: .top)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return deadsticks.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
guard let cell = tableView.dequeueReusableCell(withIdentifier: "Cell") else
{
fatalError("Could not degueue a cell")
}
let deadstick = deadsticks[indexPath.row]
cell.textLabel?.text = deadstick.aircraft
return cell
}
override func tableView(_ tableView: UITableView, canEditRowAt
indexPath: IndexPath) -> Bool {
return true
}
override func tableView(_ tableView: UITableView, commit
editingStyle: UITableViewCellEditingStyle, forRowAt indexPath:
IndexPath) {
if editingStyle == .delete {
deadsticks.remove(at: indexPath.row)
tableView.deleteRows(at: [indexPath], with: .fade)
DeadStick.saveDeadSticks(deadsticks)
DispatchQueue.main.async {
if indexPath.row < tableView.numberOfRows(inSection: indexPath.section) {
self.tableView.selectRow(at: indexPath, animated: true, scrollPosition: .top)
} else {
if tableView.numberOfRows(inSection: indexPath.section) > 0 {
self.tableView.selectRow(at: IndexPath(row: 0, section: indexPath.section), animated: true, scrollPosition: .top)
}
}
}
}
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
selectedItem = indexPath
print(selectedItem.row)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
super.prepare(for: segue, sender: sender)
switch(segue.identifier ?? "") {
case "addDetail":
if let index = self.tableView.indexPathForSelectedRow {
self.tableView.deselectRow(at: index, animated: true)
}
detailViewController?.previousSelectionPath = selectedItem
os_log("Adding New Aircraft.", log: OSLog.default, type: .debug)
case "showDetail":
let detailViewController = (segue.destination as! UINavigationController).topViewController as! DetailViewController
let indexPath = tableView.indexPathForSelectedRow!
let selectedDeadStick = deadsticks[indexPath.row]
detailViewController.deadstick = selectedDeadStick
detailViewController.navigationItem.leftBarButtonItem = nil
default:
fatalError("Unexpected Segue Identifier; \(String(describing: segue.identifier))")
}
}
@IBAction func unwindAircraftData(segue: UIStoryboardSegue) {
guard segue.identifier == "saveUnwind" else {
tableView.selectRow(at: selectedItem, animated: true, scrollPosition: .none)
return }
let sourceViewController = segue.source as!
DetailViewController
if let deadstick = sourceViewController.deadstick {
if let selectedIndexPath =
tableView.indexPathForSelectedRow {
deadsticks[selectedIndexPath.row] = deadstick
tableView.reloadRows(at: [selectedIndexPath],
with: .none)
tableView.selectRow(at: selectedIndexPath, animated: true, scrollPosition: .none)
DeadStick.saveDeadSticks(deadsticks)
} else {
let newIndexPath = IndexPath(row: deadsticks.count,
section: 0)
deadsticks.append(deadstick)
tableView.insertRows(at: [newIndexPath],
with: .automatic)
DeadStick.saveDeadSticks(deadsticks)
tableView.selectRow(at: newIndexPath, animated: true, scrollPosition: .none)
}
}
}
}
