controllerDidChangeContent not called - ios

Question

My app is quite simple: a TableViewController displays the content stored in Core Data. An add button pushes a second view modally which allows me to save stuff into Core Data. I am using NSFetchedResultsController to populate the main VC. If I save stuff to Core Data and present the main view controller again, my tableView doesn't refresh its data. I think it is because the delegate methods are not called. Any idea why?
import UIKit
import CoreData
class MainTableViewController: UITableViewController, NSFetchedResultsControllerDelegate {
var managedContext: NSManagedObjectContext!
var fetchedResultsController: NSFetchedResultsController!
lazy var coreDataStack = CoreDataStack()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.setToolbarItems(toolBar().cons, animated: true)
self.navigationController?.setToolbarHidden(false, animated: true)
let fetchRequest = NSFetchRequest(entityName: "CDPodcast")
let sort = NSSortDescriptor(key: "artist", ascending: true)
fetchRequest.sortDescriptors = [sort]
managedContext = coreDataStack.context
fetchedResultsController = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: managedContext, sectionNameKeyPath: nil, cacheName: nil)
fetchedResultsController.delegate = self
var error: NSError? = nil
if (!fetchedResultsController.performFetch(&error)) {
println("Error: \(error?.localizedDescription)")
}
}
None of the below are called
func controller(controller: NSFetchedResultsController, didChangeSection sectionInfo: NSFetchedResultsSectionInfo, atIndex sectionIndex: Int, forChangeType type: NSFetchedResultsChangeType) {
println("change section")
}
func controllerWillChangeContent(controller: NSFetchedResultsController) {
tableView.reloadData()
println("begin updates")
}
func controllerDidChangeContent(controller: NSFetchedResultsController) {
tableView.reloadData()
println("end updates")
}
Edit: More code
func saveToCoreData(name: String, artist: String, summary: String, feedURL: String, artworkURL: String, date: NSDate, episodes: [MWFeedItem]) {
self.managedContext = coreDataStack.context
let podcastEntity = NSEntityDescription.entityForName("CDPodcast", inManagedObjectContext: self.managedContext)
currentPodcast = CDPodcast(entity: podcastEntity!, insertIntoManagedObjectContext: self.managedContext)
currentPodcast.name = name
currentPodcast.artist = artist
currentPodcast.summary = summary
currentPodcast.feedURL = feedURL
currentPodcast.artworkURL = artworkURL
currentPodcast.date = date
let episodesEntity = NSEntityDescription.entityForName("CDEpisode", inManagedObjectContext: self.managedContext)
for var i = 0; i < episodes.count; i++ {
let episodesToSave = CDEpisode(entity: episodesEntity!, insertIntoManagedObjectContext: self.managedContext)
var episode: AnyObject = currentPodcast.episode.mutableCopy() as! NSMutableOrderedSet
println("There are \(episodes.count) items in the episodes array")
episodesToSave.title = episodes[i].title
episodesToSave.downloadURL = episodes[i].enclosures[0].valueForKey("url") as! String
episodesToSave.showNotes = episodes[i].summary
episode.addObject(episodesToSave)
currentPodcast.episode = episode.copy() as! NSOrderedSet
}
self.coreDataStack.saveContext()
}

Answer 1

The issue with this was that my ManagedObjectContext wasn't being passed around properly. println(context) returned different memory addresses between the App Delegate and View Controller #3. I didn't find a proper way to fix this so I am just passing the context between view controllers. Having the right context fixed it.