FetchedResultsTableViewController

FetchedResultsTableViewController.swift

//
//  FetchedResultsTableViewController.swift
//  SmashtagA5
//
//  Created by Paul Hegarty on 2/3/17.
//  Copyright © 2017 Stanford University. All rights reserved.
//

import UIKit
import CoreData

class FetchedResultsTableViewController: UITableViewController, NSFetchedResultsControllerDelegate
{
    public func controllerWillChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
        tableView.beginUpdates()
    }
    
    public func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange sectionInfo: NSFetchedResultsSectionInfo, atSectionIndex sectionIndex: Int, for type: NSFetchedResultsChangeType) {
        switch type {
        case .insert: tableView.insertSections([sectionIndex], with: .fade)
        case .delete: tableView.deleteSections([sectionIndex], with: .fade)
        default: break
        }
    }
    
    public func controller(_ controller: NSFetchedResultsController<NSFetchRequestResult>, didChange anObject: Any, at indexPath: IndexPath?, for type: NSFetchedResultsChangeType, newIndexPath: IndexPath?) {
        switch type {
        case .insert:
            tableView.insertRows(at: [newIndexPath!], with: .fade)
        case .delete:
            tableView.deleteRows(at: [indexPath!], with: .fade)
        case .update:
            tableView.reloadRows(at: [indexPath!], with: .fade)
        case .move:
            tableView.deleteRows(at: [indexPath!], with: .fade)
            tableView.insertRows(at: [newIndexPath!], with: .fade)
        }
    }
    
    public func controllerDidChangeContent(_ controller: NSFetchedResultsController<NSFetchRequestResult>) {
        tableView.endUpdates()
    }
}


extension ***YOUR_CLASS_HERE***
{
    // MARK: UITableViewDataSource Common Methods
    
    override func numberOfSections(in tableView: UITableView) -> Int {
        return fetchedResultsController?.sections?.count ?? 1
    }
    
    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        if let sections = fetchedResultsController?.sections, sections.count > 0 {
            return sections[section].numberOfObjects
        } else {
            return 0
        }
    }
    
    override func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        if let sections = fetchedResultsController?.sections, sections.count > 0 {
            return sections[section].name
        } else {
            return nil
        }
    }
    
    override func sectionIndexTitles(for tableView: UITableView) -> [String]? {
        return fetchedResultsController?.sectionIndexTitles
    }
    
    override func tableView(_ tableView: UITableView, sectionForSectionIndexTitle title: String, at index: Int) -> Int {
        return fetchedResultsController?.section(forSectionIndexTitle: title, at: index) ?? 0
    }
  
  // MARK: UITableViewDataSource - Configure Cell here with objetct at indexPath
      override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = tableView.dequeueReusableCell(withIdentifier: "Your_Cell_ID_GOES_HERE", for: indexPath)
        
        if let twitterUser = fetchedResultsController?.object(at: indexPath) {
            // Configure Cell here
        }
    
        return cell
    }
  
}