SafeFetchedResultsController.swift

import Foundation
import CoreData

class SafeFetchedResultsController: NSFetchedResultsController {
    
    private weak var safeDelegate: NSFetchedResultsControllerDelegate?
    
    override var delegate: NSFetchedResultsControllerDelegate? {
        get {
            return safeDelegate
        }
        set {
            safeDelegate = newValue
            super.delegate = newValue
        }
    }
}