NSOutlineView Data Source - objective-c

Question

I've created an NSOutlineView(Sourcelist) in Xcode, given it an outlet, and made my class implement NSOutlineViewDataSource. I then [outlineview setDataSource:], and I see that it creates the cells with the number of items from my array, but they are all blank.
sub1 = [NSArray arrayWithObjects:#"General Data",#"Most Played", #"Misc",#"Log", nil];
sub2 = [NSArray arrayWithObjects:#"General Data", #"Most Played", #"Misc",#"Log", nil];
items = [NSArray arrayWithObjects:sub1,sub2,nil];
[outlin setDataSource:self];
[outlin reloadData];
- (BOOL)outlineView:(NSOutlineView *)outlineView isItemExpandable:(id)item
{
return [self outlineView:outlineView numberOfChildrenOfItem:item] != 0;
}
- (NSInteger)outlineView:(NSOutlineView *)outlineView numberOfChildrenOfItem:(id)item
{
if (item)
if ([item isKindOfClass:[NSArray class]])
return [item count];
else
return 0;
else
return [items count];
}
- (id)outlineView:(NSOutlineView *)outlineView child:(NSInteger)index ofItem:(id)item
{
if (item) {
return [item objectAtIndex:index];
}
else
return [items objectAtIndex:index];
}
- (id)outlineView:(NSOutlineView *)outlineView objectValueForTableColumn:(NSTableColumn *)theColumn byItem:(id)item
{
if (item) {
if ([item isKindOfClass:[NSArray class]])
return #"YES"; // Return name for this node
else
return item;
}
else
return #"List Root";
}
Everything appears to be in order, an it kind of works, except all the text is blank. It creates all the root items and such just without text.

Answer 1

Maybe you forgot to build a table column for your NSOutlineView like this:
NSTableColumn *titleColumn = [[[NSTableColumn alloc] initWithIdentifier:#"identifier"] autorelease];
[[titleColumn headerCell] setStringValue:#"Header"];
[self addTableColumn:titleColumn];
[self setOutlineTableColumn:titleColumn];