特殊核心数据获取

好吧,我自己想出来了。基本上填充一个数组 partNames 根据我的信息 NSFetchedResultsController :

for (int i = 0; i < [[self.fetchedResultsController sections] count]; i++) {
    id <NSFetchedResultsSectionInfo> sectionInfo = [[self.fetchedResultsController sections] objectAtIndex:i];
    [partNames addObject:[sectionInfo name]];
}

- (NSFetchedResultsController *)fetchedResultsController {

if (fetchedResultsController_ != nil) {
   return fetchedResultsController_;

}

NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Person" inManagedObjectContext:self.managedObjectContext];
[fetchRequest setEntity:entity];
[fetchRequest setFetchBatchSize:20];



NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:NO];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil];
[fetchRequest setSortDescriptors:sortDescriptors];

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

[aFetchedResultsController release];
[fetchRequest release];
[sortDescriptor release];
[sortDescriptors release];

NSError *error = nil;
if (![fetchedResultsController_ performFetch:&error]) {
    NSLog(@"Unerwarteter Fehler %@, %@", error, [error userInfo]);
    abort();
}

return fetchedResultsController_;

}

这将为您提供按名称和组bu名称排序的所有人员,删除重复值。

-----创建fetcgccontroller时,必须提到sectionNameKeyPath * * -----------