NSFetchedResultsController in Swift

NSFetchedResultsController in Swift

    lazy var fetchedResultsController: NSFetchedResultsController = {

        let moc = CoreDataTools.sharedInstance.managedObjectContext!

        let entity = NSEntityDescription.entityForName("Certificate", inManagedObjectContext: moc)

        

        let fetchRequest = NSFetchRequest(entityName: NSStringFromClass(Certificate))

        fetchRequest.entity = entity

        fetchRequest.sortDescriptors = [NSSortDescriptor(key: "date", ascending: true)]

        

        var frc = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: moc, sectionNameKeyPath: nil, cacheName: nil)

        var error: NSError? = nil

        frc.performFetch(&error)

        if let e = error {

            println("Error was \(e)")

        }

        return frc

    }()

    func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {

        var count = 0

        if let s = self.fetchedResultsController.sections as? [NSFetchedResultsSectionInfo] {

            count = s[section].numberOfObjects

        }

        return count

    }

    lazy var collectionView: UICollectionView = {

        var layoutView = UICollectionViewFlowLayout()

        layoutView.sectionInset = UIEdgeInsetsMake(0, 10, 0, 10)

        layoutView.scrollDirection = UICollectionViewScrollDirection.Horizontal

        layoutView.itemSize = CGSizeMake(100, 100)

        layoutView.minimumLineSpacing = 10

        layoutView.minimumInteritemSpacing = 5

        var colView = UICollectionView(frame: CGRectZero, collectionViewLayout: layoutView)

        colView.setTranslatesAutoresizingMaskIntoConstraints(false)

        colView.registerClass(UICollectionViewCell.self, forCellWithReuseIdentifier: "CertificationCellReuse")

        colView.delegate = self

        colView.dataSource = self

        colView.backgroundColor = ThemeFactory.sharedInstance.appSecondaryColor()

        colView.bounces = true

        colView.alwaysBounceHorizontal = true

        colView.scrollIndicatorInsets = UIEdgeInsetsMake(0,0,3,0)

        colView.indicatorStyle = UIScrollViewIndicatorStyle.Black

        return colView

    }()