You should probably save the master MOC in strides as well. No sense having that MOC wait until the end to save. It has its own thread, and it will help keep memory down as well. You wrote: Then at the end of the import process, I save on the master/parent context which, ostensibly, pushes … Read more
Core Data predicates with “NOT ANY” do not work (that seem to be a Core Data bug). Actually [NSPredicate predicateWithFormat:@”NOT(ANY couponOwners.userId = %@)”, @”4″]; returns the same result set as [NSPredicate predicateWithFormat:@”ANY couponOwners.userId != %@”, @”4″]; which is of course wrong. As a workaround, you can use a SUBQUERY: [NSPredicate predicateWithFormat:@”SUBQUERY(couponOwners, $c, $c.userId == %@).@count … Read more
NEWEST SOLUTION (2017-12-12) Adding a Swift 4.0 version of the animate method. It should then be implemented in the same way as the solution below: func animate() { for cell in self.tableView.visibleCells { cell.frame = CGRect(x: self.tableView.frame.size.width, y: cell.frame.origin.y, width: cell.frame.size.width, height: cell.frame.size.height) UIView.animate(withDuration: 1.0) { cell.frame = CGRect(x: 0, y: cell.frame.origin.y, width: cell.frame.size.width, height: … Read more
This should do the trick for you: – (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { NSString *rawDateStr = [[[self.fetchedResultsController sections] objectAtIndex:section] name]; // Convert rawDateStr string to NSDate… NSDateFormatter *formatter = [[[NSDateFormatter alloc] init] autorelease]; [formatter setDateFormat:@”yyyy-MM-dd HH:mm:ss ZZ”]; NSDate *date = [formatter dateFromString:rawDateStr]; // Convert NSDate to format we want… [formatter setDateFormat:@”d MMMM yyyy”]; NSString *formattedDateStr … Read more
Since you cannot sort on a transient property, the solution I implemented is… Create a string attribute called “sectionKey” for each sortable attribute within each entity in your Core Data model. The sectionKey attribute will be a calculated value derived from a base attribute (e.g., a name or title attribute). It must be persisted because … Read more
Given a NSDate * startDate and endDate and a NSManagedObjectContext * moc: NSPredicate *predicate = [NSPredicate predicateWithFormat:@”(date >= %@) AND (date <= %@)”, startDate, endDate]; NSFetchRequest *request = [[[NSFetchRequest alloc] init] autorelease]; [request setEntity:[NSEntityDescription entityForName:@”EntityName” inManagedObjectContext:moc]]; [request setPredicate:predicate]; NSError *error = nil; NSArray *results = [moc executeFetchRequest:request error:&error];
The NSFetchedResultsController is only designed to watch one entity at a time. Your setup, while it makes sense, it a bit beyond what the NSFetchedResultsController is currently capable of watching on its own. My recommendation would be to set up your own watcher. You can base it off the ZSContextWatcher I have set up on … Read more
OK, I will explain your problem, then I will let you judge whether it is a bug in FRC or not. If you think it is a bug, then you really should file a bug report with apple. Your fetch result controller predicate is like this: NSString *predicate = [NSString stringWithFormat: @”clockSet.isOpen == YES”]; which … Read more
Turns out main NSManagedObjectContext didn’ t event fire NSManagedObjectContextObjectsDidChangeNotification for updated objects because it is not done for faulted objects. Generic fix (or keep a track of object IDs that needs this treatment): NSManagedObjectContext *context = [self managedObjectContext]; for(NSManagedObject *object in [[notification userInfo] objectForKey:NSUpdatedObjectsKey]) { [[context objectWithID:[object objectID]] willAccessValueForKey:nil]; } [context mergeChangesFromContextDidSaveNotification:notification]; From NSManagedObject Class … Read more