Pfthb

I have been stuck on this error for quite some time now. I have a UITabBar with 2 tabs. The first one contains a UITableViewController with meals on different dates of the week. The second tab contains a UIViewController with a login screen.

The UITableViewController is called 'EettafelView'. It gets it's meals (using Alamofire) from an online source and presents them in the application. They are cached in CoreData and retrieved using a NSFetchedResultsController to present them. For this i'm using the default UITableViewDelegates (numberOfRowsInSection, numberOfSections etc) - If they are relevant i'll post them in an edit.

When the tableview loads and i have set the fetchController and have performed a fetch i pretty-print its objects to test what it holds and if the sort-descriptors have done their job. This leads to the following:

Hollandse stoof met bokbier - Optional("maandag, 20 feb.")
 Gehaktballetjes
 Quorn gehakt
Stamppot van verse spinazie - Optional("dinsdag, 21 feb.")
 Rookworst
 Kaasspies
Indiase Curry - Optional("woensdag, 22 feb.")
 Kip
 Bloemkool
Pasta Mexicane - Optional("donderdag, 23 feb.")
 Gehakt
 Tofu en Bruine Bonen
Boeuf des Gardiens - Optional("vrijdag, 24 feb.")
 Rundvlees
 Kastanjechampignons

With pretty-print code:

if let objects = fetchController?.fetchedObjects as? [Gerecht] 
 for object in objects 
 print("(object.basis ?? "") - (object.dateString)")
 print("t(object.vlees ?? "")")
 print("t(object.vega ?? "")")
 

This is exactly how it is supposed to be. Thus the FetchController holds the right objects and has them sorted correctly. The view however looks likes this:

The section titles are wrong. The code to retrieve the section titles is as follows:

override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? 
 if let sections = fetchController?.sections, sections.count > 0 
 return sections[section].name
 else 
 return nil
 

Which is I think as generic as it can be. What can be the problem of it retrieving the wrong section titles?

EDIT: - CellForRow Method

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell 
 let cell = tableView.dequeueReusableCell(withIdentifier: "Eettafel") as? Eettafel_Cell
 let gerecht = fetchController?.object(at: indexPath) as? Gerecht
 if let gerecht = gerecht 
 cell?.gerecht = gerecht
 

 return cell!

EDIT - Gerecht in cellForRow

printing the description of the NSManagedObject (breakpoint at if-let gerecht) gives:

Printing description of gerecht.some:
<Almanapp.Gerecht: 0x1740b77c0> (entity: Gerecht; id: 0xd0000000000c0000 <x-coredata://A6B5411D-DF77-43DE-8084-86C76C42F68A/Gerecht/p3> ; data: 
 basis = "Hollandse stoof met bokbier";
 date = "2017-02-20 00:23:07 +0000";
 dateString = "maandag, 20 feb.";
 status = nil;
 vega = "Quorn gehakt";
 vlees = Gehaktballetjes;
)

Which is correct.

Try replacing your titleForHeaderInSection function for this.

override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? 
 if let gerecht = fetchController?.object(at: IndexPath(row: 0, section: section)) as? Gerecht 
 return gerecht.dateString 
 else 
 return nil 
 

I think the problem is you were using:

if let sections = fetchController?.sections, sections.count > 0 {
 return sections[section].name

Check that and tell me please

You need to add sort descriptor by sectionNameKeyPath for your fetchRequest as FIRST item in array of sort descriptors:

 let request: NSFetchRequest<YourMO> = YourMO.fetchRequest()
 let dateSorting = NSSortDescriptor(key: "date", ascending: true)
 let sectionSorting = NSSortDescriptor(key: "sectionIdentifier", ascending: true)
 request.sortDescriptors = [sectionSorting, dateSorting]
 frc = NSFetchedResultsController(fetchRequest: request, managedObjectContext: context, sectionNameKeyPath: "sectionIdentifier", cacheName: nil)