ios – NSFetchedResultsController总是包含临时对象

let fetchrequest = NSFetchrequest(entityName: "Order")
        fetchrequest.includesPendingChanges = false
        fetchrequest.sortDescriptors = [
            NSSortDescriptor(key: "status",ascending: falsE),NSSortDescriptor(key: "date",ascending: falsE)]

        self.fetchedResultsController = NSFetchedResultsController(
            fetchrequest: fetchrequest,managedObjectContext: DataStoreManager.sharedInstance.mainContext,sectionNameKeyPath: "section",cachename: nil)

        do {
            try self.fetchedResultsController.performFetch()

        } catch let error as NSError {
            print(error)
        }

问题是即使将includesPendingChanges设置为false,它仍然会在每次创建新对象时调用控制器(控制器：NSFetchedResultsController,didChangeObject anObject：AnyObject,aTindexPath indexPath：NSIndexPath ?,forChangeType类型：NSFetchedResultsChangeType,newIndexPath：NSIndexPath？)上下文(不保存).

还有什么我应该寻找以避免这种情况吗？