核心数据严重应用程序错误在controllerDidChangeContent [英] Core Data Serious Application Error at controllerDidChangeContent

问题描述

CoreData：错误：严重的应用程式错误。

在调用-controllerDidChangeContent时，NSFetchedResultsController的委托捕获到异常：。

无效的更新：段数无效。

表视图中包含的节的数量update（7）必须等于更新（6）之前表视图中包含的节数，
加或减插入或删除的节数（插入0，删除0）。 with userInfo（null）

我的应用程序有多个部分tableView。
并且错误只发生在我尝试插入新的部分记录。
如果该部分已存在，则不会发生错误。

相关代码如下。

   - （void）controllerWillChangeContent：（NSFetchedResultsController *）controller 
 {
 [self.tableView beginUpdates]; 
} 
 
  - （void）controller：（NSFetchedResultsController *）controller didChangeObject：（id）anObject 
 atIndexPath：（NSIndexPath *）indexPath forChangeType：（NSFetchedResultsChangeType）type 
 newIndexPath：（NSIndexPath *）newIndexPath 
 {
 UITableView * tableView = self.tableView; 
 DLog（@newIndexPath％@，newIndexPath）; 
 switch（type）{
 case NSFetchedResultsChangeInsert：
 [tableView insertRowsAtIndexPaths：@ [newIndexPath] withRowAnimation：UITableViewRowAnimationFade]; 
 break; 
 
 case NSFetchedResultsChangeDelete：
 [tableView deleteRowsAtIndexPaths：@ [indexPath] withRowAnimation：UITableViewRowAnimationFade]; 
 break; 
 
 case NSFetchedResultsChangeUpdate：
 [self configureCell：[tableView cellForRowAtIndexPath：indexPath] atIndexPath：indexPath]; 
 break; 
 
 case NSFetchedResultsChangeMove：
 [tableView deleteRowsAtIndexPaths：@ [indexPath] withRowAnimation：UITableViewRowAnimationFade]; 
 [tableView insertRowsAtIndexPaths：@ [newIndexPath] withRowAnimation：UITableViewRowAnimationFade]; 
 break; 
} 
} 
 
  - （void）controllerDidChangeContent：（NSFetchedResultsController *）controller 
 {
 / * NSError * error = nil; 
 if（！[[self fetchedResultsController] performFetch：& error]）{
 DLog（@Unresolved error％@，％@，error，[error userInfo]）; 
 abort（）; 
} 
 [self.tableView reloadData]; * / 
 [self.tableView endUpdates]; 
} 
  

同样我把sectionNameKeyPath放在fetchResultsController。
年列不存在于真正的核心数据中，它是扩展列。

  NSFetchedResultsController * aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest：fetchRequest managedObjectContext：self.managedObjectContext sectionNameKeyPath：@yearcacheName：@Master]; 
  

解决方案

我可以通过以下更改来解决错误。
只适用于同样情况的人。

我注释掉了以下行。

   - （void）controllerWillChangeContent：（NSFetchedResultsController *）controller 
 {
 [self.tableView beginUpdates]; 
} 
 
  - （void）controller：（NSFetchedResultsController *）controller didChangeObject：（id）anObject 
 atIndexPath：（NSIndexPath *）indexPath forChangeType：（NSFetchedResultsChangeType）type 
 newIndexPath：（NSIndexPath *）newIndexPath 
 {
 UITableView * tableView = self.tableView; 
 DLog（@newIndexPath％@，newIndexPath）; 
 switch（type）{
 case NSFetchedResultsChangeInsert：
 [tableView insertRowsAtIndexPaths：@ [newIndexPath] withRowAnimation：UITableViewRowAnimationFade]; 
 break; 
 
 case NSFetchedResultsChangeDelete：
 [tableView deleteRowsAtIndexPaths：@ [indexPath] withRowAnimation：UITableViewRowAnimationFade]; 
 break; 
 
 case NSFetchedResultsChangeUpdate：
 [self configureCell：[tableView cellForRowAtIndexPath：indexPath] atIndexPath：indexPath]; 
 break; 
 
 case NSFetchedResultsChangeMove：
 [tableView deleteRowsAtIndexPaths：@ [indexPath] withRowAnimation：UITableViewRowAnimationFade]; 
 [tableView insertRowsAtIndexPaths：@ [newIndexPath] withRowAnimation：UITableViewRowAnimationFade]; 
 break; 
} 
} 
 
  - （void）controllerDidChangeContent：（NSFetchedResultsController *）controller 
 {
 [self.tableView endUpdates]; 
} 
  

我添加了以下行。

   - （void）controllerDidChangeContent：（NSFetchedResultsController *）controller 
 {
 //在最简单，最高效的情况下，重新加载表视图。 
 NSError * error = nil; 
 if（！[[self fetchedResultsController] performFetch：& error]）{
 DLog（@Unresolved error％@，％@，error，[error userInfo]）; 
 abort（）; 
} 
 [self.tableView reloadData]; 
} 
  

Hello I am stacked now with the error below.

CoreData: error: Serious application error.
An exception was caught from the delegate of NSFetchedResultsController during a call to -controllerDidChangeContent:.
Invalid update: invalid number of sections.
The number of sections contained in the table view after the update (7) must be equal to the number of sections contained in the table view before the update (6), plus or minus the number of sections inserted or deleted (0 inserted, 0 deleted). with userInfo (null)

My application has multiple sections tableView. And error only occurs when I try to insert new section record. If the section already exists, error not occurred.

The related code is following.

- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller
{
    [self.tableView beginUpdates];
}

- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject
       atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type
       newIndexPath:(NSIndexPath *)newIndexPath
{
     UITableView *tableView = self.tableView;
     DLog(@"newIndexPath %@",newIndexPath);
    switch(type) {
        case NSFetchedResultsChangeInsert:
            [tableView insertRowsAtIndexPaths:@[newIndexPath] withRowAnimation:UITableViewRowAnimationFade];
            break;

        case NSFetchedResultsChangeDelete:
        [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
            break;

        case NSFetchedResultsChangeUpdate:
            [self configureCell:[tableView cellForRowAtIndexPath:indexPath] atIndexPath:indexPath];
            break;

        case NSFetchedResultsChangeMove:
            [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
            [tableView insertRowsAtIndexPaths:@[newIndexPath]withRowAnimation:UITableViewRowAnimationFade];
            break;
    }
}

- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller
{
    /*NSError *error = nil;
    if (![[self fetchedResultsController] performFetch:&error]) {
        DLog(@"Unresolved error %@, %@", error, [error userInfo]);
        abort();
    }
    [self.tableView reloadData];*/
    [self.tableView endUpdates];
}

Also I put sectionNameKeyPath at fetchResultsController. year column does not exist in real core data, it is extension column.

    NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:@"year" cacheName:@"Master"];

解决方案

I could resolve the error by the following changes. Just for someone in the same situation.

I commented out the following line.

- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller
{
    [self.tableView beginUpdates];
}

- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject
       atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type
      newIndexPath:(NSIndexPath *)newIndexPath
{
    UITableView *tableView = self.tableView;
    DLog(@"newIndexPath %@",newIndexPath);
    switch(type) {
        case NSFetchedResultsChangeInsert:
            [tableView insertRowsAtIndexPaths:@[newIndexPath] withRowAnimation:UITableViewRowAnimationFade];
            break;

        case NSFetchedResultsChangeDelete:
            [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
            break;

        case NSFetchedResultsChangeUpdate:
            [self configureCell:[tableView cellForRowAtIndexPath:indexPath] atIndexPath:indexPath];
            break;

        case NSFetchedResultsChangeMove:
            [tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
            [tableView insertRowsAtIndexPaths:@[newIndexPath]withRowAnimation:UITableViewRowAnimationFade];
            break;
    }
}

- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller
{
    [self.tableView endUpdates];
}

And I added the following line.

 - (void)controllerDidChangeContent:(NSFetchedResultsController *)controller
 {
 // In the simplest, most efficient, case, reload the table view.
     NSError *error = nil;
     if (![[self fetchedResultsController] performFetch:&error]) {
         DLog(@"Unresolved error %@, %@", error, [error userInfo]);
         abort();
     }
     [self.tableView reloadData];
 }

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