bme-ios - UberNotebook

UNAppDelegate-fetch.m

NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@"Note" 
  inManagedObjectContext:context];
[fetchRequest setEntity:entity];
NSArray *fetchedObjects = [context executeFetchRequest:fetchRequest error:&error];
for (NSManagedObject *note in fetchedObjects) 
{
  NSLog(@"Title: %@", [note valueForKey:@"title"]);
  NSLog(@"Content: %@", [note valueForKey:@"content"]);
}

UNAppDelegate-insert_objects.m

NSManagedObjectContext* context = [self managedObjectContext];        
    
NSManagedObject* notebook = [NSEntityDescription insertNewObjectForEntityForName:@"Notebook"
  inManagedObjectContext:context];
NSString* notebookTitle = [NSString stringWithFormat:@"Jegyzetek %d", arc4random_uniform(1000)];    
[notebook setValue:notebookTitle forKey:@"title"];
   
NSManagedObject* note = [NSEntityDescription insertNewObjectForEntityForName:@"Note" inManagedObjectContext:context];
[note setValue:@"Személyes adatok" forKey:@"title"];
[note setValue:@"Név: Almás Aladár" forKey:@"content"];
// [NSDate date] az aktuális idővel lesz inicializáva 
[note setValue:[NSDate date] forKey:@"creationDate"];
[note setValue:notebook forKey:@"notebook"];

NSError *error;
if (![context save:&error]) 
{
  NSLog(@"Sikertelen mentés: %@", [error localizedDescription]);
}
else
{
  NSLog(@"Sikeres mentés");
}

UNNotebookViewController-fetchNotebooks.m

- (void)fetchNotebooks
{
    NSManagedObjectContext* context = [[UNAppDelegate sharedAppDelegate] managedObjectContext];
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"Notebook" inManagedObjectContext:context];
    [fetchRequest setEntity:entity];
    NSError *error;
    _notebooks = [context executeFetchRequest:fetchRequest error:&error];
}

UNNoteViewController-alertViewDidDismiss.m

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{
    if (buttonIndex == 1)
    {
        NSString* content = [[alertView textFieldAtIndex:0] text];
        
        NSManagedObjectContext* context = [[UNAppDelegate sharedAppDelegate] managedObjectContext];
        NSEntityDescription* noteEntity = [NSEntityDescription entityForName:@"Note" inManagedObjectContext:context];
        Note* note = (Note *)[[NSManagedObject alloc] initWithEntity:noteEntity insertIntoManagedObjectContext:context];
        note.content = content;
        if ([content length] < 30)
            note.title = content;
        else
            note.title = [content substringToIndex:30];
        
        note.creationDate = [NSDate date];
        [self.notebook addNotesObject:note];        
    }
}

UNNoteViewController-NSFetchedResultsControllerDelegate.m

- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller
{
    [self.tableView beginUpdates];
}

- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type newIndexPath:(NSIndexPath *)newIndexPath
{    
    UITableView *tableView = self.tableView;
    
    switch(type) {
            
        case NSFetchedResultsChangeInsert:
            [tableView insertRowsAtIndexPaths:@[newIndexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
            break;
            
        case NSFetchedResultsChangeDelete:
            break;
            
        case NSFetchedResultsChangeUpdate:
            break;
            
        case NSFetchedResultsChangeMove:
            break;
    }
}

- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller
{
    [self.tableView endUpdates];
}

UNNoteViewController-viewDidLoad.m

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.title = self.notebook.title;
    
    NSManagedObjectContext* context = [[UNAppDelegate sharedAppDelegate] managedObjectContext];
    
    NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription entityForName:@"Note" 
      inManagedObjectContext:context];
    [fetchRequest setEntity:entity];
    
    // szűrés a kiválasztott Notebook-ra
    NSPredicate* predicate = 
      [NSPredicate predicateWithFormat:@"notebook == %@", _notebook];
    [fetchRequest setPredicate: predicate];
    
    // rendezés creationDate szerint
    NSSortDescriptor *sort = [[NSSortDescriptor alloc]
                              initWithKey:@"creationDate" ascending:NO];
    [fetchRequest setSortDescriptors:[NSArray arrayWithObject:sort]];
    
    // egyszerre maximum 30 note lekérése
    [fetchRequest setFetchBatchSize:30]; 
    
    _fetchedResultsController =
      [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest 
        managedObjectContext:context sectionNameKeyPath:nil 
	      cacheName:nil];

    NSError *error;
    if (![_fetchedResultsController performFetch:&error])
    {
		  NSLog(@"Hiba a lekérdezéskor %@, %@", error, [error userInfo]);
    }
}