我正在尝试从表视图中删除一行,但是我收到此错误: ***由于未捕获的异常终止应用程序' NSInternalInconsistencyException',原因:'无效更新:第0部分中的行数无效。更新后现有部分中包含的行数(4)必须等于更新前的该部分中包含的行数(4),加上或减去从该部分插入或删除的行数(插入0,删除1),加上或减去移入的行数或超出该部分(0移入,0移出)。'
这是我的代码:
import UIKit
import CoreData
class VehiclesTableViewController: UITableViewController {
// MARK: - Model
var vehiclesStored = [Array<Vehicle>]() {
didSet {
tableView.reloadData()
}
}
var managedObjectContext: NSManagedObjectContext? = (UIApplication.shared.delegate as? AppDelegate)?.managedObjectContext
// MARK: - Lifecycle methods
override func viewDidLoad() {
super.viewDidLoad()
vehiclesStored.removeAll()
vehiclesStored.insert(Vehicle.fetchVehicles(inManagedObjectContext: managedObjectContext!)!, at: 0)
navigationItem.title = String(vehiclesStored[0].count) + " Vehicles"
// Uncomment the following line to preserve selection between presentations
// self.clearsSelectionOnViewWillAppear = false
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
self.navigationItem.leftBarButtonItem = self.editButtonItem
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return vehiclesStored.count
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return vehiclesStored[section].count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "vehiclesList", for: indexPath)
// Configure the cell...
let vehicles = vehiclesStored[indexPath.section][indexPath.row]
cell.textLabel?.text = (vehicles.id_brand_model?.id_model?.brand)! + ", " + (vehicles.id_brand_model?.model)! + ", " + (vehicles.id_vehicle_type?.type)!
let dateFormatter = DateFormatter()
dateFormatter.dateFormat = "EEE, dd MMM yyy hh:mm:ss"
cell.detailTextLabel?.text = String(vehicles.id as! Int64) + ", " + vehicles.licence_plate! + ", " + (vehicles.id_color?.color_description)! + ", " + dateFormatter.string(from:vehicles.date as! Date)
return cell
}
// Override to support conditional editing of the table view.
override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
// Return false if you do not want the specified item to be editable.
return true
}
// Override to support editing the table view.
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
// Delete the row from the data source
vehiclesStored[0].remove(at: indexPath.row)
tableView.deleteRows(at: [indexPath], with: .fade)
} else if editingStyle == .insert {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
/*
// Override to support rearranging the table view.
override func tableView(_ tableView: UITableView, moveRowAt fromIndexPath: IndexPath, to: IndexPath) {
}
*/
/*
// Override to support conditional rearranging of the table view.
override func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool {
// Return false if you do not want the item to be re-orderable.
return true
}
*/
// MARK: - Navigation
@IBAction func unwindVehicleList(sender: UIStoryboardSegue) {
if let sourceViewController = sender.source as? VehicleAddViewController {
if let vehicles = sourceViewController.vehicle {
if let selectedIndexPath = tableView.indexPathForSelectedRow {
// Update an existing vehicle.
vehiclesStored[selectedIndexPath.section][selectedIndexPath.row] = vehicles
tableView.reloadRows(at: [selectedIndexPath], with: .none)
}
else {
// Add a new vehicle.
vehiclesStored.removeAll()
vehiclesStored.insert(Vehicle.fetchVehicles(inManagedObjectContext: managedObjectContext!)!, at: 0)
tableView.reloadData()
}
}
}
}
// a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
if segue.identifier != nil {
if segue.identifier == "Show Detail" {
let vehicleDetailViewController = segue.destination as! VehicleAddViewController
// Get the cell that generated this segue.
if let selectedVehicleCell = sender as? UITableViewCell {
let indexPath = tableView.indexPath(for: selectedVehicleCell)!
let selectedVehicle = vehiclesStored[indexPath.section][indexPath.row]
vehicleDetailViewController.vehicle = selectedVehicle
}
}
else if segue.identifier == "Add Item" {
print("Adding new vehicle.")
}
}
}
}
为什么会这样?
答案 0 :(得分:0)
我的问题出现在我的var的didSet中,它正在重新加载数据,并且在删除行时没有检测到任何更改