我正在尝试模仿 iPhone 日历列表视图并在列表中显示我的约会。不管我是否有“今天”的约会，我都希望有一个包含今天日期的部分。使用下面的 fetchController 我将如何检查，然后如果今天没有约会，添加一个空白部分而不是弄乱排序？
- (NSFetchedResultsController *)fetchedResultsController {
// if (fetchedResultsController != nil) {
// return fetchedResultsController;
// }
/*
Set up the fetched results controller.
*/
// Create the fetch request for the entity.
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
// Edit the entity name as appropriate.
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Appointments" inManagedObjectContext:[[CoreDataHelper sharedInstance] managedObjectContext]];
[fetchRequest setEntity:entity];
//[fetchRequest setIncludesPendingChanges:YES];
// Set the batch size to a suitable number.
//[fetchRequest setFetchBatchSize:20];
// Sort using the date / then time property.
NSSortDescriptor *sortDescriptorDate = [[NSSortDescriptor alloc] initWithKey:@"date" ascending:YES];
NSSortDescriptor *sortDescriptorTime = [[NSSortDescriptor alloc] initWithKey:@"start_time" ascending:YES selector:@selector(localizedStandardCompare:)];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptorDate, sortDescriptorTime, nil];
[fetchRequest setSortDescriptors:sortDescriptors];
// Use the sectionIdentifier property to group into sections.
NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:[[CoreDataHelper sharedInstance] managedObjectContext] sectionNameKeyPath:@"date" cacheName:nil];
aFetchedResultsController.delegate = self;
self.fetchedResultsController = aFetchedResultsController;
return fetchedResultsController;
}