documentation for NSFetchedResultsController에는 완벽하게 작동하는 샘플 코드가 있습니다. 결과가 articleSection으로 분류되어 있으므로
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return [[self.fetchedResultsController sections] count];
}
- (NSInteger)tableView:(UITableView *)table numberOfRowsInSection:(NSInteger)section {
id <NSFetchedResultsSectionInfo> sectionInfo = [[self.fetchedResultsController sections] objectAtIndex:section];
return [sectionInfo numberOfObjects];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = /* get the cell */;
NSManagedObject *managedObject = [self.fetchedResultsController objectAtIndexPath:indexPath];
// Configure the cell with data from the managed object.
return cell;
}
- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
id <NSFetchedResultsSectionInfo> sectionInfo = [[self.fetchedResultsController sections] objectAtIndex:section];
return [sectionInfo name];
}
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView {
return [self.fetchedResultsController sectionIndexTitles];
}
- (NSInteger)tableView:(UITableView *)tableView sectionForSectionIndexTitle:(NSString *)title atIndex:(NSInteger)index {
return [self.fetchedResultsController sectionForSectionIndexTitle:title atIndex:index];
}
는 가져 오기 요청의 sortDescriptors을 설정합니다.
sectionKeyPath를 "articleSection"으로 설정하면 NSFetchedResultsController가 섹션을 만듭니다. 이런 식으로 뭔가 :
NSFetchRequest *request = [[NSFetchRequest alloc] init];
request.entity = [NSEntityDescription entityForName:@"Item" inManagedObjectContext:self.managedObjectContext];;
request.fetchBatchSize = 20;
// sort by "articleSection"
NSSortDescriptor *sortDescriptorCategory = [NSSortDescriptor sortDescriptorWithKey:@"articleSection" ascending:YES];
request.sortDescriptors = [NSArray arrayWithObjects:sortDescriptorCategory, nil];;
// create nsfrc with "articleSection" as sectionNameKeyPath
NSFetchedResultsController *frc = [[NSFetchedResultsController alloc] initWithFetchRequest:request managedObjectContext:self.managedObjectContext sectionNameKeyPath:@"articleSection" cacheName:@"MyFRCCache"];
frc.delegate = self;
NSError *error = nil;
if (![frc performFetch:&error]) {
NSLog(@"Unresolved error %@, %@", error, [error userInfo]);
abort();
}
self.fetchedResultsController = frc;
이 스레드 http://stackoverflow.com/questions/8037588/sectionindextitlesfortableview-keys-are-off/8037745#8037745에 내 대답을 참조하십시오. 도움이 되길 바랍니다. – iamsult