FetchedResultsControllerDataSource

FetchedResultsControllerDataSource.h

//
//
//  FetchedResultsControllerDataSource.h
//
//  Created by Ben Norris on 10/3/14.
//  Copyright (c) 2014 BSN Design. All rights reserved.
//

#import <Foundation/Foundation.h>

@class NSFetchedResultsController;

@protocol FetchedResultsControllerDataSourceDelegate <NSObject>

-(void)configureCell:(id)cell withObject:(id)object;
-(void)deleteObject:(id)object;

@end

@interface FetchedResultsControllerDataSource : NSObject <UITableViewDataSource,NSFetchedResultsControllerDelegate>

@property (nonatomic, strong) NSFetchedResultsController *fetchedResultsController;
@property (nonatomic, weak) id<FetchedResultsControllerDataSourceDelegate> delegate;
@property (nonatomic, copy) NSString *reuseIdentifier;

- (id)initWithTableView:(UITableView *)tableView;
- (void)registerTableView:(UITableView *)tableView withCell:(id)cell;
- (id)selectedItem;

@end

FetchedResultsControllerDataSource.m

//
//  FetchedResultsControllerDataSource.m
//  Scores
//
//  Created by Ben Norris on 10/3/14.
//  Copyright (c) 2014 BSN Design. All rights reserved.
//

#import "FetchedResultsControllerDataSource.h"

@interface FetchedResultsControllerDataSource()

@property (nonatomic, strong) UITableView *tableView;

@end

@implementation FetchedResultsControllerDataSource

- (id)initWithTableView:(UITableView *)tableView {
    self = [super init];
    if (self) {
        self.tableView = tableView;
        self.tableView.dataSource = self;
    }
    return self;
}

- (void)registerTableView:(UITableView *)tableView withCell:(id)cell {
    [tableView registerClass:[cell class] forCellReuseIdentifier:self.reuseIdentifier];
}

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

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return [[self.fetchedResultsController.sections objectAtIndex:section] numberOfObjects];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    id object = [self.fetchedResultsController objectAtIndexPath:indexPath];
    id cell = [tableView dequeueReusableCellWithIdentifier:self.reuseIdentifier forIndexPath:indexPath];
    [self.delegate configureCell:cell withObject:object];
    return cell;
}

- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        [self.delegate deleteObject:[self.fetchedResultsController objectAtIndexPath:indexPath]];
    }
}

#pragma mark - Fetched Results Controller Delegate

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

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

- (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type newIndexPath:(NSIndexPath *)newIndexPath {
    switch (type) {
        case NSFetchedResultsChangeInsert:
            [self.tableView insertRowsAtIndexPaths:@[newIndexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
            break;
        case NSFetchedResultsChangeMove:
            [self.tableView moveRowAtIndexPath:indexPath toIndexPath:newIndexPath];
            break;
        case NSFetchedResultsChangeDelete:
            [self.tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
            break;
        default:
            break;
    }
}

- (void)setFetchedResultsController:(NSFetchedResultsController *)fetchedResultsController {
    _fetchedResultsController = fetchedResultsController;
    fetchedResultsController.delegate = self;
    [fetchedResultsController performFetch:nil];
}

- (id)selectedItem {
    NSIndexPath *path = self.tableView.indexPathForSelectedRow;
    return path ? [self.fetchedResultsController objectAtIndexPath:path] : nil;
}
@end