Created
January 12, 2019 01:49
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| class MyViewController: UIViewController { | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| do { | |
| try fetchedResultsController.performFetch() | |
| } catch { | |
| print("Error") | |
| } | |
| } | |
| private lazy var fetchedResultsController: NSFetchedResultsController<MyModel> = { | |
| let fetchRequest: NSFetchRequest<Station> = ... | |
| let frc = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: container.viewContext, sectionNameKeyPath: nil, cacheName: nil) | |
| frc.delegate = self | |
| return frc | |
| }() | |
| } | |
| extension MyViewController: UITableViewDataSource { | |
| func numberOfSectionsInTableView(tableView: UITableView) -> Int { | |
| if let sections = fetchedResultsController.sections { | |
| return sections.count | |
| } | |
| return 0 | |
| } | |
| func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { | |
| if let currSection = fetchedResultsController.sections?[section] { | |
| return currSection.numberOfObjects | |
| } | |
| return 0 | |
| } | |
| func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { | |
| let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) | |
| configureCell(cell, at: indexPath) | |
| return cell | |
| } | |
| func configureCell(_ cell: UITableViewCell, at indexPath: IndexPath) { | |
| let item = fetchedResultsController.object(at: indexPath) | |
| cell.textLabel?.text = item.name | |
| // Your custom code to update the cell | |
| } | |
| } | |
| extension MyViewController: NSFetchedResultsControllerDelegate { | |
| func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange sectionInfo: NSFetchedResultsSectionInfo, | |
| atSectionIndex sectionIndex: Int, for type: NSFetchedResultsChangeType) { | |
| let indexSet = NSIndexSet(index: sectionIndex) as IndexSet | |
| switch type { | |
| case .insert: | |
| tableView.insertSections(indexSet, with: .fade) | |
| case .delete: | |
| tableView.deleteSections(indexSet, with: .fade) | |
| default: | |
| break | |
| } | |
| } | |
| func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange anObject: Any, at indexPath: IndexPath?, | |
| for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) { | |
| switch (type) { | |
| case .insert: | |
| guard let i = newIndexPath else { return } | |
| tableView.insertRows(at: [i], with: .fade) | |
| case .delete: | |
| guard let i = indexPath else { return } | |
| tableView.deleteRows(at: [i], with: .fade) | |
| case .update: | |
| guard let i = indexPath, let cell = tableView.cellForRow(at: i) else { return } | |
| configureCell(cell, at: i) | |
| case .move: | |
| if let indexPath = indexPath { | |
| tableView.deleteRows(at: [indexPath], with: .fade) | |
| } | |
| if let newIndexPath = newIndexPath { | |
| tableView.insertRows(at: [newIndexPath], with: .fade) | |
| } | |
| } | |
| } | |
| func controllerWillChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) { | |
| tableView.beginUpdates() | |
| } | |
| func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) { | |
| tableView.endUpdates() | |
| } | |
| } |
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