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这是一个错误：的iOS 9 - “尝试删除并重新加载相同的索引路径”
CoreData: error: Serious application error. An exception was caught from the delegate of NSFetchedResultsController during a call to -controllerDidChangeContent:. attempt to delete and reload the same index path ({length = 2, path = 0 - 0}) with userInfo (null)
这是我的典型NSFetchedResultsControllerDelegate：
func controllerWillChangeContent(controller: NSFetchedResultsController) {
tableView.beginUpdates()
}
func controller(controller: NSFetchedResultsController, didChangeSection sectionInfo: NSFetchedResultsSectionInfo, atIndex sectionIndex: Int, forChangeType type: NSFetchedResultsChangeType) {
let indexSet = NSIndexSet(index: sectionIndex)
switch type {
case .Insert:
tableView.insertSections(indexSet, withRowAnimation: .Fade)
case .Delete:
tableView.deleteSections(indexSet, withRowAnimation: .Fade)
case .Update:
fallthrough
case .Move:
tableView.reloadSections(indexSet, withRowAnimation: .Fade)
}
}
func controller(controller: NSFetchedResultsController, didChangeObject anObject: NSManagedObject, atIndexPath indexPath: NSIndexPath?, forChangeType type: NSFetchedResultsChangeType, newIndexPath: NSIndexPath?) {
switch type {
case .Insert:
if let newIndexPath = newIndexPath {
tableView.insertRowsAtIndexPaths([newIndexPath], withRowAnimation: .Fade)
}
case .Delete:
if let indexPath = indexPath {
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
}
case .Update:
if let indexPath = indexPath {
tableView.reloadRowsAtIndexPaths([indexPath], withRowAnimation: .None)
}
case .Move:
if let indexPath = indexPath {
if let newIndexPath = newIndexPath {
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
tableView.insertRowsAtIndexPaths([newIndexPath], withRowAnimation: .Fade)
}
}
}
}
func controllerDidChangeContent(controller: NSFetchedResultsController) {
tableView.endUpdates()
}
在viewDidLoad()：
private func setupOnceFetchedResultsController() {
if fetchedResultsController == nil {
let context = NSManagedObjectContext.MR_defaultContext()
let fetchReguest = NSFetchRequest(entityName: "DBOrder")
let dateDescriptor = NSSortDescriptor(key: "date", ascending: false)
fetchReguest.predicate = NSPredicate(format: "user.identifier = %@", DBAppSettings.currentUser!.identifier)
fetchReguest.sortDescriptors = [dateDescriptor]
fetchReguest.fetchLimit = 10
fetchedResultsController = NSFetchedResultsController(fetchRequest: fetchReguest, managedObjectContext: context, sectionNameKeyPath: "identifier", cacheName: nil)
fetchedResultsController.delegate = self
try! fetchedResultsController.performFetch()
}
}
它解决了我的问题。但是当我添加一些行时，还有另一个问题：'尝试删除第12行中的第0行，但在userInfo（null）''更新之前只有10个部分'。你认为这也是一个错误？ –
@BartłomiejSemańczyk：这可能是您的代码中的错误或错误。这个问题还没有发生在我身上，所以我不能说。你有没有检查iOS 8模拟器？ –
不，它在工作之前，在这里iOS 8.3和Xcode7Beta3不起作用。更重要的是，我不试图删除任何东西，只是添加一些信息... –