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NSFetchedResultsController cheat sheet.html
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<h1 class="page-title">
NSFetchedResultsController </h1>
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<article id="post-298" class="post-298 post type-post status-publish format-standard hentry category-ios-6 category-ios-learning tag-core-data tag-nsfetchedresultscontroller">
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<h1 class="entry-title"><a href="http://iosdevblog.com/2013/07/24/nsfetchedresultscontroller-cheat-sheet/" rel="bookmark">NSFetchedResultsController cheat sheet</a></h1> <div class="entry-meta">
<span class="post-date"><a href="http://iosdevblog.com/2013/07/24/nsfetchedresultscontroller-cheat-sheet/" title="20:08" rel="bookmark"><time class="entry-date" datetime="2013-07-24T20:08:32+00:00">July 24, 2013</time></a></span><span class="byline"><span class="author vcard"><a class="url fn n" href="http://iosdevblog.com/author/plusangel/" title="View all posts by plusangel" rel="author">plusangel</a></span></span>
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<p><strong>What is NSFetchedResultsController?</strong></p>
<p>Apple says:</p>
<blockquote><p>You use a fetched results controller to efficiently manage the results returned from a Core Data fetch request to provide data for a UITableView object.</p>
<p>While table views can be used in several ways, fetched results controllers are primarily intended to assist you with a master list view. UITableView expects its data source to provide cells as an array of sections made up of rows. You configure a fetch results controller using a fetch request that specifies the entity, an array containing at least one sort ordering, and optionally a filter predicate. The fetched results controller efficiently analyzes the result of the fetch request and computes all the information about sections in the result set. It also computes all the information for the index based on the result set.</p>
<p>In addition, fetched results controllers provide the following features:</p>
<p>Optionally monitor changes to objects in the associated managed object context, and report changes in the results set to its delegate (see “The Controller’s Delegate”).<br />
Optionally cache the results of its computation so that if the same data is subsequently re-displayed, the work does not have to be repeated (see “The Cache”).</p></blockquote>
<p><strong>Declare a NSFetcedResultsController</strong></p>
<pre class="brush: objc; title: ; notranslate" title="">
@property (strong, nonatomic) NSFetchedResultsController *fetchedResultsController;
</pre>
<p><strong>Make your view controller NSFetcedResultsController delegate</strong></p>
<pre class="brush: objc; title: ; notranslate" title="">
#import &quot;myViewController.h&quot;
@interface myViewController () &lt;... , NSFetchedResultsControllerDelegate&gt;
...
@property (strong, nonatomic) NSFetchedResultsController *fetchedResultsController;
</pre>
<p><strong>How to set a NSFetcedResultsController</strong></p>
<pre class="brush: objc; title: ; notranslate" title="">
- (NSFetchedResultsController *)fetchedResultsController {
if (_fetchedResultsController != nil) {
return _fetchedResultsController;
}
NSFetchRequest *fetchRequest = [[NSFetchRequest alloc] init];
NSEntityDescription *entity = [NSEntityDescription entityForName:@&quot;Department&quot; inManagedObjectContext:self.managedObjectContext];
[fetchRequest setEntity:entity];
NSSortDescriptor *sort = [[NSSortDescriptor alloc] initWithKey:@&quot;nameOfDepartment&quot; ascending:NO];
[fetchRequest setSortDescriptors:[NSArray arrayWithObject:sort]];
[fetchRequest setFetchBatchSize:20];
NSFetchedResultsController *theFetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:self.managedObjectContext sectionNameKeyPath:nil cacheName:@&quot;Root&quot;];
self.fetchedResultsController = theFetchedResultsController;
self.fetchedResultsController.delegate = self;
return _fetchedResultsController;
}
</pre>
<p><strong>Perform a fetch from Core Data</strong></p>
<pre class="brush: objc; title: ; notranslate" title="">
- (void)viewDidLoad
{
[super viewDidLoad];
...
NSError *error;
if (![[self fetchedResultsController] performFetch:&amp;error]) {
// Update to handle the error appropriately.
NSLog(@&quot;Unresolved error %@, %@&quot;, error, [error userInfo]);
exit(-1); // Fail
}
}
</pre>
<p><strong>Get a specific object</strong></p>
<pre class="brush: objc; title: ; notranslate" title="">
aViewController.myObject = (CustomObject *)[self.fetchedResultsController objectAtIndexPath:indexPath];
</pre>
<p><strong>Count the number of objects for the sake of TableView Datasource</strong></p>
<pre class="brush: objc; title: ; notranslate" title="">
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
id sectionInfo = [[_fetchedResultsController sections] objectAtIndex:section];
return [sectionInfo numberOfObjects];
}
</pre>
<p><strong>Get the total number of fetched objects</strong></p>
<pre class="brush: objc; title: ; notranslate" title="">
[fetchedResultsController.fetchedObjects count];
</pre>
<p><strong>Perform fetch with criteria using NSPridicate</strong></p>
<pre class="brush: objc; title: ; notranslate" title="">
- (void)viewDidLoad
{
[super viewDidLoad];
...
[NSFetchedResultsController deleteCacheWithName:@&quot;Root&quot;];
NSPredicate *predicate = [NSPredicate predicateWithFormat:@&quot;department = %@&quot;, self.myDepartment];
[[self fetchedResultsController].fetchRequest setPredicate:predicate];
NSError *error;
if (![[self fetchedResultsController] performFetch:&amp;error]) {
// Update to handle the error appropriately.
NSLog(@&quot;Unresolved error %@, %@&quot;, error, [error userInfo]);
exit(-1); // Fail
}
}
</pre>
<p>Don&#8217;t forget to flush! Hmmm ok lets explain. You cannot simply change the fetch request to modify the results as the criteria change. You must delete the cache (using deleteCacheWithName:) or you should not use a cache if you are changing the fetch request (set cacheName:nil). If you are not follow either, your app will crash.</p>
<p><strong>Delete an object</strong></p>
<pre class="brush: objc; title: ; notranslate" title="">
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete) {
CustomObject *objectToDelete = [self.fetchedResultsController objectAtIndexPath:indexPath];
[self.managedObjectContext deleteObject:objectToDelete];
NSError *error = nil;
if (![_managedObjectContext save:&amp;error]) {/*
[(AppDelegate *)[UIApplication sharedApplication].delegate presentError:error WithText:NSLocalizedString(@&quot;insert categories&quot;, @&quot;Error description in saving products' categories&quot;)];*/
}
}
else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
</pre>
<p><strong>Don&#8217;t forget to include NSFetchedResultsControllerDelegate Protocol methods</strong></p>
<p>An instance of NSFetchedResultsController uses methods NSFetchedResultsControllerDelegate Protocol to notify its delegate that the controller’s fetch results have been changed due to an add, remove, move, or update operations. So, add the following methods to your .m viewController source file.</p>
<pre class="brush: objc; title: ; notranslate" title="">
/*
Assume self has a property 'tableView' -- as is the case for an instance of a UITableViewController
subclass -- and a method configureCell:atIndexPath: which updates the contents of a given cell
with information from a managed object at the given index path in the fetched results controller.
*/
- (void)controllerWillChangeContent:(NSFetchedResultsController *)controller {
[self.tableView beginUpdates];
}
- (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id )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];
}
</pre>
<p><strong>Need a good tutorial for <strong>NSFetchedResultsController</strong>?</strong><br />
Please read Adam&#8217;s Burkepile &#8220;Core Data on iOS 5 Tutorial: How To Use NSFetchedResultsController&#8221; published <a href="http://www.raywenderlich.com/999/core-data-tutorial-how-to-use-nsfetchedresultscontroller">here</a>.</p>
<p><strong>Is that all?</strong><br />
No, I&#8217;ll update it as long as I find new tips!</p>
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