Question

我有一个tableviewcontroller和一个fetchresultscontroller，用对象值填充表。我试图通过commitEditingStyle删除核心数据模型中的对象以及表中的行，但是我收到此错误。我知道错误含义，但我无法弄清楚我需要在代码中修复哪些内容才能使其消失。任何帮助表示赞赏。

错误：

EcoShoppingUI[1365:60b] *** Assertion failure in -[UITableView _endCellAnimationsWithContext:], /SourceCache/UIKit_Sim/UIKit-2935.137/UITableView.m:1368
2014-07-25 15:03:42.137 EcoShoppingUI[1365:60b] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid update: invalid number of rows in section 0.  The number of rows contained in an existing section after the update (1) must be equal to the number of rows contained in that section before the update (1), plus or minus the number of rows inserted or deleted from that section (0 inserted, 1 deleted) and plus or minus the number of rows moved into or out of that section (0 moved in, 0 moved out).'

favTable.m

#import "favTable.h"
#import "ecoAppDelegate.h"
#import "favCell.h"
#import "favButton.h"
#import "FavoritesInfo.h"





@interface favTable ()


@end

@implementation favTable

@synthesize tableView;
@synthesize managedObjectContext;
@synthesize fetchedResultsController;




- (NSFetchedResultsController *)fetchedResultsController {
    if (!fetchedResultsController) {

        self.managedObjectContext = ((ecoAppDelegate *) [UIApplication sharedApplication].delegate).managedObjectContext;


        NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
        NSEntityDescription *entity = [NSEntityDescription
                                       entityForName:@"FavoritesInfo" inManagedObjectContext:self.managedObjectContext];
        [fetchRequest setEntity:entity];

        NSSortDescriptor *sort = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:NO];



        [fetchRequest setSortDescriptors:[NSArray arrayWithObject:sort]];

        [fetchRequest setFetchBatchSize:20];


        NSFetchedResultsController *theFetchedResultsController =
        [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest
                                            managedObjectContext:self.managedObjectContext sectionNameKeyPath:nil
                                                       cacheName:@"Root"];
        fetchedResultsController = theFetchedResultsController;
        fetchedResultsController.delegate = self;
    }


    return fetchedResultsController;

}

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.title = @"Favorites";


    self.navigationController.navigationBar.translucent = NO;


    self.managedObjectContext = ((ecoAppDelegate *) [UIApplication sharedApplication].delegate).managedObjectContext;


    NSError *error;

    if (![self.fetchedResultsController performFetch:&error]) {
        // Update to handle the error appropriately.
        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
        exit(-1);  // Fail
    }


}

- (void)viewDidUnload
{


    [self setTableView:nil];
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;

    self.fetchedResultsController = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
#warning Potentially incomplete method implementation.
    // Return the number of sections.

    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
#warning Incomplete method implementation.
    // Return the number of rows in the section.

    id  sectionInfo =
    [[fetchedResultsController sections] objectAtIndex:section];




//   NSLog(@"%zd", [fetchedResultsController.fetchedObjects count]); // amount of fetched objects

    return [sectionInfo numberOfObjects];

}





- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{



    static NSString *CellIdentifier = @"favCell";


    favCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[favCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }

    // Configure the cell...

   [self configureCell:cell atIndexPath:indexPath];

    cell.cellmanu.text = @"hhjh";

    cell.cellimage.image = [UIImage imageNamed:@"test1.jpg"];



    return cell;
}


- (void)configureCell:(favCell *)cell
          atIndexPath:(NSIndexPath *)indexPath
{

    FavoritesInfo*favoritesInfo = [self.fetchedResultsController objectAtIndexPath:indexPath];


    cell.cellname.text = favoritesInfo.name;
    cell.cellscore.text = favoritesInfo.score;

    }




- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {

    if (editingStyle == UITableViewCellEditingStyleDelete) {
        // Delete the row from the data source

        ecoAppDelegate *appDelegatee = (ecoAppDelegate *)[[UIApplication sharedApplication] delegate];


        self.managedObjectContext = ((ecoAppDelegate *) [UIApplication sharedApplication].delegate).managedObjectContext;


        FavoritesInfo*favoritesInfo = [self.fetchedResultsController objectAtIndexPath:indexPath];

        [tableView
         deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]
         withRowAnimation:UITableViewRowAnimationFade];

        [self.managedObjectContext deleteObject:favoritesInfo];


        [appDelegatee saveContext]; // to save changes

        NSError *error= nil;

        if (![self.fetchedResultsController performFetch:&error]) {
            // Update to handle the error appropriately.
            NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
            exit(-1);  // Fail
        }

        [self.tableView reloadData];

    }   
    else if (editingStyle == UITableViewCellEditingStyleInsert) {
        // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
    }   
}




// FetchedResultsController update methods



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

- (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id )sectionInfo
           atIndex:(NSUInteger)sectionIndex forChangeType:(NSFetchedResultsChangeType)type {

    switch(type) {
        case NSFetchedResultsChangeInsert:
            [self.tableView insertSections:[NSIndexSet indexSetWithIndex:sectionIndex]
                          withRowAnimation:UITableViewRowAnimationFade];
            break;

        case NSFetchedResultsChangeDelete:
            [self.tableView deleteSections:[NSIndexSet indexSetWithIndex:sectionIndex]
                          withRowAnimation:UITableViewRowAnimationFade];
            break;
    }
}

- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject
       atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type
      newIndexPath:(NSIndexPath *)newIndexPath {

    UITableView *tableView = self.tableView;

    switch(type) {

        case NSFetchedResultsChangeInsert:
            [tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath]
                             withRowAnimation:UITableViewRowAnimationFade];
            break;

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

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

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

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

#pragma mark - Table view delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Navigation logic may go here. Create and push another view controller.
    /*
     <#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:@"<#Nib name#>" bundle:nil];
     // ...
     // Pass the selected object to the new view controller.
     [self.navigationController pushViewController:detailViewController animated:YES];
     */
}

@end

Answer 1

更改为：

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {

    if (editingStyle == UITableViewCellEditingStyleDelete) {
        // Delete the row from the data source

        ecoAppDelegate *appDelegatee = (ecoAppDelegate *)[[UIApplication sharedApplication] delegate];

        FavoritesInfo*favoritesInfo = [self.fetchedResultsController objectAtIndexPath:indexPath];


        [self.managedObjectContext deleteObject:favoritesInfo];


        [appDelegatee saveContext]; // to save changes

    }   
    else if (editingStyle == UITableViewCellEditingStyleInsert) {
        // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
    }   
}

很难知道代码的某些部分正在做什么，因为您正在引用您的应用代理。让我知道这是做什么的。应该对问题进行排序，但我不是100％。

Answer 2

您的节标题列应该是排序顺序中的第一个属性。

UITableView中的断言失败 - 无法找到有问题的部分

2 个答案: