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    <p>Thanks to @ggfela for his answer. The processes of his answer were spot on. Here is the actual code I put into my button/method, in hopes of it helping someone else in the future:</p> <pre><code>NSArray *moc = [[self fetchedResultsController] fetchedObjects]; for (ActiveListData *item in moc) { if (item != nil &amp;&amp; item.isChecked.boolValue == 1) { item.isChecked = [NSNumber numberWithBool:NO]; item.isActive = [NSNumber numberWithBool:NO]; } } // Call to Data Store to update the list NSError *error; if (![self.managedObjectContext save:&amp;error]) { FATAL_CORE_DATA_ERROR(error); return; </code></pre> <p><strong>Explanation:</strong></p> <p>Load the contents of the result from calling the <code>fetchedResultsController</code> method into a temporary variable named <code>moc</code></p> <p>Use a <code>for</code> loop to cycle through the array of <code>moc</code>. <code>ActiveListData</code> is the NSManagedObject subclass that I created for my Core Data and is the proper place to insert the separated values/attributes from the data store. From there, it's pretty simple, I ensure that <code>item</code> is not <code>nil</code> AND that the item's attribute is the value I need. </p> <p><strong>NOTE</strong> </p> <p>Core Data does not store the bool values YES and NO but rather 1 and 0, respectively but when you call or compare the values, you simply can not compare the value of <code>item.isChecked</code> because it is being passed back to you as a bool not as an integer. You can not simply compare <code>item.isChecked == YES</code> either since the <code>@property</code> of <code>isChecked</code> is an <code>NSNumber</code>. So, in the case of the <code>if</code> I put <code>item.isChecked.boolValue</code> as this will give me the representing integer for it's bool value, in this case I have it check for a 1 (YES). (Sorry if my explanation is wrong and/or confusing, but this is how I understand it and is the only way this code works.)</p> <p>Then, setting the new values of these attributes is like you would expect when setting any other variable. The only "tricky" difference with this is that the NSManagedObject subclass sets the <code>@property</code> of the <code>isChecked</code> and <code>isActive</code> to an <code>NSNumber</code> (as mentioned earlier) so in order to send the proper values back to Core Data you use the method <code>numberWithBool</code> of the <code>NSNumber</code> class.</p> <p>And just in case anyone gets confused by my <code>FATAL_CORE_DATA_ERROR(error)</code> call this is simply a macro that was defined inside the <code>Prefix.pch</code> file to handle my errors from the managedObjectContext. You can use any (or none) error handling you choose.</p> <p>Thanks again @ggfela for your help!! If anyone else has any other suggestions on how this code should be applied, then please let me know!</p>
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    1. POiOS Core Data - Updating Multiple records
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    1. USJT Smith
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    1. COGood job, I totally forgot CoreData uses NSNumbers instead of booleans.
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