NTDCoreDataTableViewController/NTDCoreDataTableViewController.m

//
//  CoreDataTableViewController.m
//
//  Created by Nicholas Tian on 3/2/14.
//  Copyright (c) 2014 Nicholas Tian. All rights reserved.
//

#import "NTDCoreDataTableViewController.h"

@interface NTDCoreDataTableViewController ()

@end

@implementation NTDCoreDataTableViewController

#pragma mark - Incomplete Method Implementation


- (NSString *)cellIdentifier
{
    return nil;
}

- (NSFetchedResultsController *)newFetchedResultsController
{
    return nil;
}

- (void)configureCell:(UITableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath
{
    
}

#pragma mark - Table View Data Source

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSParameterAssert(indexPath.row < [self tableView:self.tableView numberOfRowsInSection:indexPath.section]);
    
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:[self cellIdentifier] forIndexPath:indexPath];
    
    // Configure the cell...
    [self configureCell:cell atIndexPath:indexPath];
    
    return cell;
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return [[self.fetchedResultsController sections] count];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    NSInteger numberOfRows = 0;
    
    if ([[self.fetchedResultsController sections] count] > 0) {
        id <NSFetchedResultsSectionInfo> sectionInfo = [[self.fetchedResultsController sections] objectAtIndex:section];
        numberOfRows = [sectionInfo numberOfObjects];
    }
    
    return numberOfRows;
}

#pragma mark - NSFetchedResultsController and Delegate

- (NSFetchedResultsController *)fetchedResultsController
{
    if (_fetchedResultsController == nil) {
        _fetchedResultsController = [self newFetchedResultsController];
    }
	
	return _fetchedResultsController;
}

// Copied from NSFetchedResultsControllerDelegate Protocol Reference

- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller {
    [self.tableView beginUpdates];
}


- (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id <NSFetchedResultsSectionInfo>)sectionInfo
           atIndex:(NSUInteger)sectionIndex forChangeType:(NSFetchedResultsChangeType)type {
    
    switch(type) {
        case NSFetchedResultsChangeInsert:
            [self.tableView insertSections:[NSIndexSet indexSetWithIndex:sectionIndex]
                          withRowAnimation:UITableViewRowAnimationFade];
            break;
            
        case NSFetchedResultsChangeDelete:
            [self.tableView deleteSections:[NSIndexSet indexSetWithIndex:sectionIndex]
                          withRowAnimation:UITableViewRowAnimationFade];
            break;
    }
}


- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject
       atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type
      newIndexPath:(NSIndexPath *)newIndexPath {
    
    UITableView *tableView = self.tableView;
    
    switch(type) {
            
        case NSFetchedResultsChangeInsert:
            [tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath]
                             withRowAnimation:UITableViewRowAnimationFade];
            break;
            
        case NSFetchedResultsChangeDelete:
            [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]
                             withRowAnimation:UITableViewRowAnimationFade];
            break;
            
        case NSFetchedResultsChangeUpdate:
            [self configureCell:[tableView cellForRowAtIndexPath:indexPath]
                    atIndexPath:indexPath];
            break;
            
        case NSFetchedResultsChangeMove:
            [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath]
                             withRowAnimation:UITableViewRowAnimationFade];
            [tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:newIndexPath]
                             withRowAnimation:UITableViewRowAnimationFade];
            break;
    }
}


- (void)controllerDidChangeContent:(NSFetchedResultsController *)controller {
    [self.tableView endUpdates];
}

@end