Uitableview 核心数据：deleteObject不会触发表更新

我有一个带有菜单项的UITableView，当菜单更改时，服务器会将新列表推送到设备上。当我添加菜单项或提交更改时更改菜单项时，显示列表的表视图会自动更新

但是，当我删除一个对象时，这不会反映在列表中（当我更改顺序时，也不会反映，这意味着对象的“级别”字段）

这些更改仅在我完全关闭（杀死）应用程序并重新启动后显示

没有触发更新的原因很简单吗

for(DOMenuItem* item in _oldMenuIdList){
    [[self managedObjectContext] deleteObject:item]; 
}

NSError *error;

if(![[self managedObjectContext] save:&error]) {
    NSLog(@"Error!");
}

[编辑：]

@interface DOMenuItem : NSManagedObject {

}

@property (nonatomic, strong) NSNumber * id;
@property (nonatomic, strong) NSString * action;
@property (nonatomic, strong) NSString * title;
@property (nonatomic, strong) NSString * section;
@property (nonatomic, strong) NSNumber * level;
@property (nonatomic, strong) NSNumber * published;
@property (nonatomic, strong) NSString * icon;
@property (nonatomic, strong) NSDate * lastUpdate;
@property (nonatomic, strong) DOMenuItem * parent;
@property (nonatomic, strong) DOLang * language;
@property (nonatomic, strong) NSSet* children;
@property (nonatomic, strong) NSSet* groups;

@end

@interface DOMenuItem (CoreDataGeneratedAccessors)
- (void)addChildren:(NSSet *)value;
- (void)removeChildren:(NSSet *)value;

- (void)addGroups:(NSSet *)value;
- (void)removeGroups:(NSSet *)value;
- (void)addGroupsObject:(DOGroup *)value;
- (void)removeGroupsObject:(DOGroup *)value;
@end

-

[编辑2:] 在UIViewController中：

- (void)viewDidLoad
{
iDomsAppDelegate *delegate = (iDomsAppDelegate *)[[UIApplication sharedApplication] delegate];

// Get the menu's
_objects = [[[DOMenuItemsController alloc] init:[delegate managedObjectContext]] findChildrenOfMenu:(DOMenuItem*) _parentMenu];

[_objects setDelegate:self];
}

[编辑3:]

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


- (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id <NSFetchedResultsSectionInfo>)sectionInfo
           atIndex:(NSUInteger)aSectionIndex forChangeType:(NSFetchedResultsChangeType)type {
    NSUInteger sectionIndex = aSectionIndex;

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

        case NSFetchedResultsChangeDelete:
            [self.tableView deleteSections:[NSIndexSet indexSetWithIndex:sectionIndex]
                          withRowAnimation:UITableViewRowAnimationFade];
            break;
        case NSFetchedResultsChangeMove:
            NSLog(@"NEED TO LOOK AT THIS!");
            break;
        case NSFetchedResultsChangeUpdate:
            NSLog(@"NEED TO LOOK AT THIS!");
            break;

    }
}


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

    UITableView *tableView = [self tableView];

    switch(type) {
        case NSFetchedResultsChangeInsert: {
            //NSLog(@"Inserted!");
            [tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:aNewIndexPath]
                             withRowAnimation:UITableViewRowAnimationFade];
            }
            break;

        case NSFetchedResultsChangeDelete:{
            //NSLog(@"Delete");

            // Skip if previous in section had same commonId
            NSLog(@"Table delete... r:%li - s:%li", (long)aIndexPath.row, (long)aIndexPath.section);

            [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:aIndexPath]
                             withRowAnimation:UITableViewRowAnimationFade];
            }
            break;

        case NSFetchedResultsChangeUpdate:
            //NSLog(@"Update menu");
            [(DOPrototypeCell*) [tableView cellForRowAtIndexPath:aIndexPath] populateCell:[_objects objectAtIndexPath:aIndexPath]];
            [tableView reloadRowsAtIndexPaths:[NSArray arrayWithObject:aIndexPath] withRowAnimation:UITableViewRowAnimationFade];
            break;

        case NSFetchedResultsChangeMove:{
            //NSLog(@"Move");
            [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:aIndexPath]
                             withRowAnimation:UITableViewRowAnimationFade];

            [tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:aNewIndexPath]
                             withRowAnimation:UITableViewRowAnimationFade];
            }
            break;
    }
}


- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller {
    @try {
        [self.tableView endUpdates];
    } @catch (NSException *exception) {
        NSLog(@"Caught error on finding tabelview update: %@", exception.description);
        [self.tableView reloadData];
    }

    [self checkViewheight];
}

-（void）controllerWillChangeContent:（NSFetchedResultsController*）控制器{
[self.tableView开始更新]；
}
-（void）控制器：（NSFetchedResultsController*）控制器didChangeSection:（id）sectionInfo
atIndex:（nsInteger）changeType:（NSFetchedResultsChangeType）类型的操作索引{
NSU整数sectionIndex=ASEOCTIONINDEX；
开关（类型）{
案例NSFetchedResultsChangesInsert：
[self.tableView insertSections:[NSIndexSet IndexSetWithiIndex:sectionIndex]
withRowAnimation:UITableViewRowAnimationFade]；
打破
案例NSFetchedResultsChangeDelete：
[self.tableView deleteSections:[NSIndexSet IndexSetWithiIndex:sectionIndex]
withRowAnimation:UITableViewRowAnimationFade]；
打破
案例NSFetchedResultsChangeMove：
NSLog（@“需要看看这个！”）；
打破
案例NSFetchedResultsChangeUpdate：
NSLog（@“需要看看这个！”）；
打破
}
}
-（void）控制器：（NSFetchedResultsController*）控制器didChangeObject:（id）一个对象
atIndexPath:（NSIndexPath*）更改类型的ADINDEXPATH:（NSFETCHEDEDRESULTSCHANGETPE）类型
newindepath:（nsindepath*）anewindepath{
UITableView*tableView=[self tableView]；
开关（类型）{
案例NSFetchedResultsChangesInsert：{
//NSLog（@“已插入！”）；
[tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:aNewIndexPath]
withRowAnimation:UITableViewRowAnimationFade]；
}
打破
案例NSFetchedResultsChangeDelete：{
//NSLog（@“删除”）；
//如果节中的上一个具有相同的commonId，则跳过
NSLog（@“表删除…r:%li-s:%li”，（长）aIndexPath.row，（长）aIndexPath.section）；
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:aIndexPath]
withRowAnimation:UITableViewRowAnimationFade]；
}
打破
案例NSFetchedResultsChangeUpdate：
//NSLog（“更新菜单”）；
[（DOPrototypeCell*）[tableView cellForRowAtIndexPath:aIndexPath]populateCell:[\u objects objectAtIndexPath:aIndexPath]]；
[tableView重新加载RowsAndExpaths:[NSArray arrayWithObject:aIndexPath]和RowAnimation:UITableViewRowAnimationFade]；
打破
案例NSFetchedResultsChangeMove：{
//NSLog（@“移动”）；
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:aIndexPath]
withRowAnimation:UITableViewRowAnimationFade]；
[tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:aNewIndexPath]
withRowAnimation:UITableViewRowAnimationFade]；
}
打破
}
}
-（void）controllerDidChangeContent:（NSFetchedResultsController*）控制器{
@试一试{
[self.tableView endUpdates]；
}@catch（NSException*exception）{
NSLog（@“在查找选项卡视图更新时捕获错误：%@”，异常。说明）；
[self.tableView重载数据]；
}
[自检视图高度]；
}

请发布表视图数据源方法，如果您使用的是NSFetchedResultsController，请发布FRC初始化和委托方法。谢谢。添加的信息有用吗？是的，谢谢。您是否在任何地方设置FRC

代表

？我在那些方法中看不到它。是的，在UIViewController中，在viewDidLoad上（我添加了代码，但它不是什么特别的东西）。“objects”是从前面引用的过程返回的NSFetchedResultsController。我不明白的是，为什么新行和内容更新有效，但删除（以及顺序的更改，如果支持的话）无效。是的-这表明

controller:didChangeObject:atIndexPath:forChangeType:…

方法有问题。其中通常有一个

switch

语句，其中包含不同的

大小写

，用于不同的更改类型：插入、删除、移动和更新。你有那样的东西吗？

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


- (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id <NSFetchedResultsSectionInfo>)sectionInfo
           atIndex:(NSUInteger)aSectionIndex forChangeType:(NSFetchedResultsChangeType)type {
    NSUInteger sectionIndex = aSectionIndex;

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

        case NSFetchedResultsChangeDelete:
            [self.tableView deleteSections:[NSIndexSet indexSetWithIndex:sectionIndex]
                          withRowAnimation:UITableViewRowAnimationFade];
            break;
        case NSFetchedResultsChangeMove:
            NSLog(@"NEED TO LOOK AT THIS!");
            break;
        case NSFetchedResultsChangeUpdate:
            NSLog(@"NEED TO LOOK AT THIS!");
            break;

    }
}


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

    UITableView *tableView = [self tableView];

    switch(type) {
        case NSFetchedResultsChangeInsert: {
            //NSLog(@"Inserted!");
            [tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:aNewIndexPath]
                             withRowAnimation:UITableViewRowAnimationFade];
            }
            break;

        case NSFetchedResultsChangeDelete:{
            //NSLog(@"Delete");

            // Skip if previous in section had same commonId
            NSLog(@"Table delete... r:%li - s:%li", (long)aIndexPath.row, (long)aIndexPath.section);

            [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:aIndexPath]
                             withRowAnimation:UITableViewRowAnimationFade];
            }
            break;

        case NSFetchedResultsChangeUpdate:
            //NSLog(@"Update menu");
            [(DOPrototypeCell*) [tableView cellForRowAtIndexPath:aIndexPath] populateCell:[_objects objectAtIndexPath:aIndexPath]];
            [tableView reloadRowsAtIndexPaths:[NSArray arrayWithObject:aIndexPath] withRowAnimation:UITableViewRowAnimationFade];
            break;

        case NSFetchedResultsChangeMove:{
            //NSLog(@"Move");
            [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:aIndexPath]
                             withRowAnimation:UITableViewRowAnimationFade];

            [tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:aNewIndexPath]
                             withRowAnimation:UITableViewRowAnimationFade];
            }
            break;
    }
}


- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller {
    @try {
        [self.tableView endUpdates];
    } @catch (NSException *exception) {
        NSLog(@"Caught error on finding tabelview update: %@", exception.description);
        [self.tableView reloadData];
    }

    [self checkViewheight];
}