Question

我尝试将非某些Core Data对象与Core Data对象混合使用，我使用TLIndexPathTools这样做。

- (TLIndexPathDataModel *)controller:(TLIndexPathController *)controller willUpdateDataModel:(TLIndexPathDataModel *)oldDataModel withDataModel:(TLIndexPathDataModel *)updatedDataModel
{
    NSMutableArray *sectionInfos = [NSMutableArray array];
    TLIndexPathSectionInfo *section0 = [[TLIndexPathSectionInfo alloc] initWithItems:@[@"item1", @"item2"] name:@"section0"];
    [sectionInfos addObject:section0];
    [sectionInfos addObjectsFromArray:updatedDataModel.sections];
    return [[TLIndexPathDataModel alloc] initWithSectionInfos:sectionInfos identifierKeyPath:nil];
}

我正在使用TLIndexPathTableViewController并设置TLIndexPathController，如下所示：

- (void)setupIndexPathController
{

    NSFetchRequest *fetchRequest;

    NSString *sectionNameKeyPath;
    if (self.product) {


        fetchRequest = [SubMenus getSubMenusForProduct:self.product];

        sectionNameKeyPath = @"group.name";        


    }else if (self.cartProduct) {

        fetchRequest = [SubMenuProductCart getSubMenusForProductCart:self.cartProduct];

        sectionNameKeyPath = @"group.subMenusGroup.name";

    }


    [TLIndexPathController deleteCacheWithName:@"SubMenuGroupTitles"];

    self.indexPathController = nil;
    self.indexPathController = [[TLIndexPathController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:sectionNameKeyPath identifierKeyPath:nil cacheName:@"SubMenuGroupTitles"];

 NSError *error;
    [self.indexPathController performFetch:&error];
}

在我的viewDidAppear中调用此设置方法，以便获取和刷新对象。

但是当我调用[self.indexPathController.dataModel itemAtIndexPath：indexPath]时;在我的DidSelectRow方法中，我得到了以下崩溃：

 CoreData: error: Serious application error.  Exception was caught during Core Data change processing.  This is usually a bug within an observer of NSManagedObjectContextObjectsDidChangeNotification.  *** -[__NSArrayM objectAtIndex:]: index 0 beyond bounds for empty array with userInfo

Answer 1

崩溃似乎是您访问空数组。因此，请始终检查数组中的nil并计算大于零的条件，以确保不会发生崩溃。并且在将对象添加到数组之前进行检查，您是否已经初始化了数组。否则它永远不会添加任何对象

- [__ NSArrayM objectAtIndex：]：索引0超出了带有userInfo（null）的空数组的边界

1 个答案: