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我知道这已被各种问题所涵盖，但我无法弄清楚这一点。

据我所知，我的设置是正确的。我的第一个排序描述符sectionNameKeyPath完全匹配。

我的客户很少遇到这种崩溃，可能是因为它不在通常打开那么长时间的屏幕上。因为崩溃很少见，所以我根本无法重现它。

它在 viewWillAppear->table reloadData->numberOfSectionsInTableView->accessor for nsfetchedresultscontroller 执行 fetch 时崩溃。

它总是记录给我的崩溃报告者的相同错误消息，但编号不同： 索引 9 处的已获取对象有一个乱序部分名称 '2。对象必须按部分名称排序'

我使用 statusId 字段，它始终是 1-5 的数字。

代码：

- (NSFetchedResultsController *)unitsFetchedResultsController
{
    if (unitsFetchedResultsController != nil) {
        return unitsFetchedResultsController;
    }

    // SELECT * from Unit
    NSFetchRequest* fetchRequest = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"Unit" inManagedObjectContext:self.guestCard.managedObjectContext];
    [fetchRequest setEntity:entity];
    // make this more defensive by limiting the status ids (1-14ish are valid on the backend, we only display these) 
    NSPredicate *availablePredicate = [NSPredicate predicateWithFormat:@"available = 1"];
    [fetchRequest setPredicate:availablePredicate];
    // ORDER BY ready DESC, availableDate ASC  (ATGT - must sort by 'ready' first or else 'sectionNameKeyPath' in the NSFetchedResultsController won't work)
    NSSortDescriptor* readySortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"statusId" ascending:YES];
    NSSortDescriptor* bedroomsSortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"floorplan.bedrooms" ascending:YES];
    NSSortDescriptor* bathroomsSortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"floorplan.baths" ascending:YES];
    NSSortDescriptor* availableDateSortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"availableDate" ascending:YES];
    [fetchRequest setSortDescriptors:[NSArray arrayWithObjects:readySortDescriptor, bedroomsSortDescriptor, bathroomsSortDescriptor, availableDateSortDescriptor, nil]];

    NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.guestCard.managedObjectContext sectionNameKeyPath:@"statusId" cacheName:@"unitsAvailable"];
    aFetchedResultsController.delegate = self;
    self.unitsFetchedResultsController = aFetchedResultsController;

    // Clean up
    [aFetchedResultsController release];
    [fetchRequest release];

    NSError *error = nil;
    if (![[self unitsFetchedResultsController] performFetch:&error]) {
        NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
        [CoreDataErrorWriter writeCoreDataErrorToFile:error];

        perimeterAppDelegate *appDelegate = APP_DELEGATE;
        [appDelegate showCoreDataError];

        [NSException raise:@"Core Data Error" format:@"Core Data Error in %@", NSStringFromClass([self class])];
    }

    return self.unitsFetchedResultsController; // I recognize I should just return the iVar, but not the problem.
}
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