Hi. I just got BookCocoaProgMacOSX and have reached Chapter 12. I am trying to implement the custom alert panel features, but the program repeatily claims that none of the items in the table view are selected, even though I have Mutliple Selection on. And the odd thing: the program does not crash, Xcode doesn’t spit out a warning or error and Interface Builder validated the interface! Here is the remove: code:

• (void)remove:(id)sender { NSArray *selectedPeople; int choice;

  NSLog(@”entered removal.”); selectedPeople = [personController selectedObjects]; if (selectedPeople == nil) { NSLog(@”selectedPeople == nil?? but how?”); return; } choice = NSRunAlertPanel(@”Delete”, @”Do you really want to delete %d %@?”, @”Delete”, @”Cancel”, nil, [selectedPeople count], (([selectedPeople count] == 1) ? @”record” : @”records”)); // without the above if, “Do you really want to delete 0 records?” would appear if (choice == NSAlertDefaultReturn) [personController remove:sender]; }

Am I doing anything wrong with this function, or is this not enough to diagnose? - PietroGagliardi

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This might be a simple question, but are you sure your outlet ‘personController’ is bound to the controller? —- That fixed it. Thanks.

I think I overlooked something in the earlier chapters :-)

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Also consider that you may be handed back an empty array. i.e., not ‘nil’, but an empty NSArray instance.