PersonsViewController.swift

// MARK: - FetchedRecordsControllerDelegate

extension PersonsViewController : FetchedRecordsControllerDelegate {
    
    func controllerWillChangeRecords<T>(controller: FetchedRecordsController<T>) {
        tableView.beginUpdates()
    }
    
    func controller<T>(controller: FetchedRecordsController<T>, didChangeRecord record: T, withEvent event:FetchedRecordsEvent) {
        switch event {
        case .Insertion(let indexPath):
            tableView.insertRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
            
        case .Deletion(let indexPath):
            tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
            
        case .Update(let indexPath, _):
            if let cell = tableView.cellForRowAtIndexPath(indexPath) {
                configureCell(cell, atIndexPath: indexPath)
            }
            
        case .Move(let indexPath, let newIndexPath, _):
            // Actually move cells around for more demo effect :-)
            let cell = tableView.cellForRowAtIndexPath(indexPath)
            tableView.moveRowAtIndexPath(indexPath, toIndexPath: newIndexPath)
            if let cell = cell {
                configureCell(cell, atIndexPath: newIndexPath)
            }
        }
    }
    
    func controllerDidChangeRecords<T>(controller: FetchedRecordsController<T>) {
        tableView.endUpdates()
    }
}