How to get one record per section when using NSFetchedResultsController

Question

I work on an iOS app that uses Core Data and I want to display an entity using UITableView.

For that I'm using a NSFetchedResultsController. The thing I am trying to achieve is to display each record in it's section. Basically I want 1 row per section.

The methods that I am struggling with are :

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView

and

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section

because I want to have this piece of code when computing the numberOfSectionsInTableView:

{
    id <NSFetchedResultsSectionInfo> sectionInfo = [[self.fetchedResultsController sections] objectAtIndex:section];
    return [sectionInfo numberOfObjects];
}

and I want to have return 1 when computing the numberOfRowsInSection (and obviously I can't pass indexPath.sectionto numberOfSectionsInTableView). What is the approach in this problem/situation? Thank you.

Answer 1

well,

Obviously, you will have as much section as you have object :

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return self.fetchedResultController.fetchedObjects.count;
}

then, you will only have one row / section since this is what you want

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
   return 1;
}

then in the cellForRowAtIndexPath use the indexPath.section as a rowIndex and the indexPath.row as the sectionIndex.

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSIndexPath * correctedIP = [NSIndexPath indexPathForRow:indexPath.section inSection:0];

    id myItem =  [self.fetchedResultController objectAtIndexPath: correctedIP];
/* ... */

}