Problem when NSOutlineView cells have the same value

Question

I have a Mac OS X application that uses NSOutlineView with two columns: a key and a value, where you can edit a column of values. I either have an NSString or an NSDictionary in a string. The code for the cell values ​​is as follows:

- (id)outlineView:(NSOutlineView *)outlineView objectValueForTableColumn:(NSTableColumn *)tableColumn byItem:(id)item {

    if ([[[tableColumn headerCell] stringValue] isEqualToString:@"Key"]) {
        id parentItem = [outlineView parentForItem:item] ? [outlineView parentForItem:item] : root;

        return [[parentItem allKeysForObject:item] objectAtIndex:0];
    } else {
        if ([item isKindOfClass:[NSString class]]) {
            return item;
        } else if ([item isKindOfClass:[NSDictionary class]]) {
            return @"";
        } else {
            return nil;
        }
    }
}

It works as it should, except when the field value has the same string value. It always just takes the first element with this value to show it as a key, so the same key value will appear for all value values ​​that are the same. Does anyone know how to fix this problem?

Answer 1

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