NSFetchedResultsController iOS 8+

SampleController.swift

extension SampleController : NSFetchedResultsControllerDelegate {
    func controllerWillChangeContent(controller: NSFetchedResultsController) {
            if controller == feedFetchedResultsController {
                tableView.beginUpdates()
            }
    }
    
    func controllerDidChangeContent(controller: NSFetchedResultsController) {
        if controller == feedFetchedResultsController {
            tableView.endUpdates()
        }
    }
    
    func controller(controller: NSFetchedResultsController, didChangeObject anObject: AnyObject, atIndexPath indexPath: NSIndexPath?, forChangeType type: NSFetchedResultsChangeType, newIndexPath: NSIndexPath?) {
            if controller == feedFetchedResultsController {
                switch (type) {
                case .Insert:
                    if let indexPath = newIndexPath {
                        tableView.insertRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
                    }
                case .Delete:
                    if let indexPath = indexPath {
                        tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
                    }
                case .Update:
                    if let indexPath = indexPath {
                        let cell = tableView.cellForRowAtIndexPath(indexPath) as? DisposableCell
                        if let cell = cell {
                            configureCell(cell, atIndexPath: indexPath)
                        }
                    }
                case .Move:
                    if let indexPath = indexPath, let newIndexPath = newIndexPath {
                        if (!indexPath.isEqual(newIndexPath)){
                            tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
                            tableView.insertRowsAtIndexPaths([newIndexPath], withRowAnimation: .Fade)
                        }else {
                            tableView.reloadRowsAtIndexPaths([indexPath], withRowAnimation: .None)
                        }
                    }
                }
            }
    }
}