TableView doesnt show any Data(CoreData) - App crashe - uitableview

Question

i cant read my data from my database. I have an app with a tabbarcontroller.
in the first tab the iphone camera takes a picture from a barcode and send the result to another view (CameraReturnDetailViewController).
In CameraReturnDetailViewController is the savebutton, and here is the code from this save button:
- (IBAction)saveAndQuitScan:(id) sender {
XLog(#"saveAndQuitScan button wurde geklickt!");
ProjectQRCodeAppDelegate *appDelegate = [[UIApplication sharedApplication]delegate];
NSManagedObjectContext *context = [appDelegate managedObjectContext];
NSManagedObject *newData;
newData = [NSEntityDescription insertNewObjectForEntityForName:#"BarcodeDaten" inManagedObjectContext:context];
[newData setValue:dataLabel.text forKey:#"Barcode_CD"];
NSError *error;
[context save:&error];
//Aktuelle ansicht (self) animiert verlassen
[self dismissModalViewControllerAnimated:YES];
// Nachdem die ansicht verlassen wurde,
// auf das zweite Tab wechseln(scanverlauf)
/** TO DO - Funktioniert noch nicht **/
[self.tabBarController setSelectedIndex:1];
}
Now, my aim is to show the taba in the second tab, in a TableView (ScansViewController):
- (void)viewDidLoad {
[super viewDidLoad];
if (managedObjectContext_ == nil)
{
managedObjectContext_ = [(ProjectQRCodeAppDelegate *)[[UIApplication sharedApplication]delegate] managedObjectContext];
NSLog(#"After managedObjectContext: %#", managedObjectContext_);
}
myTableView = [[UITableView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame] style:UITableViewStylePlain];
myTableView.delegate = self;
myTableView.dataSource = self;
myTableView.autoresizesSubviews = YES;
self.navigationItem.title = #"Code Liste";
self.view = myTableView;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [itemsList count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
}
return cell;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
NSString *selectDay = [NSString stringWithFormat:#"%d", indexPath.row];
TableDetailViewController *fvController = [[TableDetailViewController alloc] initWithNibName:#"TableDetailViewController" bundle:[NSBundle mainBundle]];
fvController.selectDay = selectDay;
[self.navigationController pushViewController:fvController animated:YES];
[fvController release];
fvController = nil;
}
- (void) configureCell:(UITableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath {
NSManagedObject *managedObject = [self.fetchedResultsController objectAtIndexPath:indexPath];
cell.textLabel.text = [[managedObject valueForKey:#"Barcode_CD"] description];
}
- (NSFetchedResultsController *) fetchedResultsController {
if (fetchedResultsController_ !=nil) {
return fetchedResultsController_;
}
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:#"BarcodeDaten" inManagedObjectContext:self.managedObjectContext];
[fetchRequest setEntity:entity];
[fetchRequest setFetchBatchSize:20];
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:#"Barcode_CD" ascending:NO];
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:sortDescriptor, nil];
[fetchRequest setSortDescriptors:sortDescriptors];
NSFetchedResultsController *aFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:nil cacheName:#"Root"];
aFetchedResultsController.delegate = self;
self.fetchedResultsController = aFetchedResultsController;
[aFetchedResultsController release];
[fetchRequest release];
[sortDescriptor release];
[sortDescriptors release];
NSError *error = nil;
if (![fetchedResultsController_ performFetch:&error]) {
XLog(#"Error: %#, %#", error, [error userInfo]);
abort();
}
return fetchedResultsController_;
}
At first i get this error when i choosed the second tab(ScansViewController):
"
Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: '+entityForName: could not locate an NSManagedObjectModel for entity name 'BarcodeDaten''
"
The Name is correct but i dont understand my mistake.
No data is showed in the Tableview, why?
Have I missed something..? Or something wrong?
Thanks for help,
brush51

Answer 1

This is the solution:
if (managedObjectContext == nil)
{
managedObjectContext = [(CoreDataBooksAppDelegate *)[[UIApplication sharedApplication] delegate] managedObjectContext];
NSLog(#"After managedObjectContext: %#", managedObjectContext);
}
this code is from here: Core-Data iPhone: could not locate an NSManagedObjectModel