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PONSArrayController initialization
 

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    <p>I am having trouble getting an core-data backed NSArrayController to work properly in my code. Below is my code:</p> <pre><code>pageArrayController = [[NSArrayController alloc] initWithContent:nil]; [pageArrayController setManagedObjectContext:[self managedObjectContext]]; [pageArrayController setEntityName:@"Page"]; [pageArrayController setAvoidsEmptySelection:YES]; [pageArrayController setPreservesSelection:YES]; [pageArrayController setSelectsInsertedObjects:YES]; [pageArrayController setClearsFilterPredicateOnInsertion:YES]; [pageArrayController setEditable:YES]; [pageArrayController setAutomaticallyPreparesContent:YES]; [pageArrayController setSortDescriptors:[NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:@"index" ascending:YES]]]; BOOL result = [pageArrayController setSelectionIndex:0]; </code></pre> <p>When I attempt to call setSelectionIndex:, it returns YES, indicating that the selection has been successfully changed. However, any subsequent getSelectionIndex calls to the pageArrayController object returns NSNotFound.</p> <p>What I don't understand is that if I put the NSArrayController into a NIB, and allow the NIB file to perform the initialization (with all of the same attributes in Interface Builder), the NSArrayController works correctly.</p> <p>Why is there a difference in behavior? Does the NIB file initialize these types of objects in a special way? Is my initialization of the NSArrayController incorrect?</p> <p>Any help is appreciated. Thanks.</p>
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    1. COThere is no such thing as a `-getSelectionIndex` method. Did you write such a method yourself, or actually calling something different?
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    2. COI meant -selectionIndex.
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