Adding sections to tableView using coreData - ios

Question

in my app the user adds cells to a tableView using coreData. This works quite well. But now I want the table view to have sections.
The viewController in which you add new cells look like:
#property (strong) NSManagedObject *travel;
...
-(void)viewDidLoad{
countryName = [[NSArray alloc] initWithObjects:
#"USA", #"England", #"Italy", nil];
countryLabel.text= [countryName objectAtIndex:[picker selectedRowInComponent:0]];
}
- (IBAction)save:(id)sender {
[self.travel setValue:countryLabel.text forKey:#"country"];
}
and in the viewController which displays the cells in a tableView:
#property (strong) NSMutableArray *travelAll;
...
NSManagedObjectContext *managedObjectContext = [self managedObjectContext];
NSPredicate *predicate=[NSPredicate predicateWithFormat:#"position == %#",_positionString];
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] initWithEntityName:#"Travel"];
[fetchRequest setPredicate : predicate ];
self.travelAll = [[managedObjectContext executeFetchRequest:fetchRequest error:nil] mutableCopy];
[self.tableView reloadData];
...
- (NSString *)tableView:(UITableView *)tableView
titleForHeaderInSection:(NSInteger)section
{ NSArray* headers = [NSArray arrayWithObjects:#"USA",#"England","Italy",nil];
return [headers objectAtIndex:section];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 3;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [self.travelAll count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
NSManagedObject *travel = [self.travelAll objectAtIndex:indexPath.row];
...
return cell;
}
But now my tableView I have just this three sections (headers) but I can't add cell to them.
For example: the user selects USA for his new cell, so this cell should be displayed in the section USA

Answer 1

Your datasource methods are flawed. For example, you are returning the same cell data for each section. There are other problems as well.
It is much better to use a NSFetchedResultsController. Start from the Apple templates (you get that if you create a new project and choose "Use Core Data"), that employ the fetched results controller.
Your section design becomes very simple then: it is enough to simply specify the sectionNameKeyPath property.