This is a small pod with a default implementation of the NSFetchedResultsControllerDelegate protocol. There is one for UITableViewController and one for UICollectionViewController as well. An FRC delegate implementation can be much more efficient at at updating these "list-o-things" views when compared to reloading the entire table (and triggering much larger redraws).

This pod effectively eliminates the boilerplate code to connect an NSFetchedResultsController and pipe its updates into one of the aforementioned view controllers. It goes one step further in extracting the DataSource protocol implementations into separate classes to make it easier for you to customize them by providing your own implementation.

Usage

To run the example project; clone the repo, and run pod install from the Example directory first.

pod try Fetchable is a short way to do this, but still doesn't run pod install for you.

Requirements

• iOS >= 6.0

Istallation

Step 1

Step 2

Create a new Cocoa Touch class that extends either FBLFetchedResultsTableViewController or FBLFetchedResultsCollectionViewController.

Step 3

In your -viewDidLoad method, put some code like the following:

#pragma mark - UIViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    FBLConfigureCellBlock configureCell = ^(UICollectionViewCell *collectionCell, id item) {
        YourCustomCollectionViewCell *cell = (YourCustomCollectionViewCell *)collectionCell;
        [cell prepareForReuse];
        ModelClass *modelInstance = (ModelClass *)item;

        cell.textLabel.text = repo.name;
    };

    NSFetchedResultsController *frc = [ModelClass MR_fetchAllSortedBy:@"name" ascending:YES
                                                        withPredicate:nil
                                                              groupBy:nil delegate:self];

    self.dataSource = [[FBLFetchedResultsCollectionViewDataSource alloc] initWithFetchedResultsController:frc
                                                                                           cellIdentifier:@"CellReuseIdentifier"
                                                                                       configureCellBlock:configureCell];
}

This code 1. Creates an FBLConfigureCellBlock which will work with the instance of the model class you are using. 2. Configures an NSFetchedResultsController (using MagicalRecord to hide CoreData boilerplate) to fetch all ModelClass objects from the context and sort them by the name property. 3. Stand up and hold onto an FBLFetchedResults*DataSource which will use the previous two objects and a fixed cell reuse identifier.

Known Issues

Single Cell Identifier

Only one cell identifier is currently supported. It would be ideal to be able to vary the cell identifier by some attribute from the model. If you get to this before I do, send me a pull request!

FRC Radar

NSFetchedResultsController does not get refreshed for added relationship

• rdar://11541277

Author

Ben Chatelain, [email protected] @phatblat

License

Fetchable is available under the MIT license. See the LICENSE file for more info.