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    <p>This question turned out to be a real tumbleweed (my second in one month) so I wanted to follow up with some more info. I ended up using the above posted code for flattening my NSOutlineView as I was unable to find a better option. When you have to recursively iterate through an unknown number of subfolders (in my case) this seems to be the best option where the <code>descendants</code> method is called for each time you reach a deeper level. I found a very useful website with a number of useful NSTreeController extensions <a href="https://wabbit.svn.codeplex.com/svn/Wabbitstudio/Mac/WabbitStudio/WabbitCode/NSTreeController+WCExtensions.m" rel="nofollow">here</a>, which uses the same approach as I had taken. Unless someone helps me figure out a faster and better algorithm for flattening the arrangedObjects of a NSTreeController, I believe i will stick with this approach.</p> <p>Cheers, Trond</p> <p><strong>Update:</strong> After a question for the solution I decided to post my method for how to flatten an outlineview. I hope his can help others.</p> <pre><code>- (void) flattenOutlineview { NSMutableArray *nodeArray = [NSMutableArray array]; [self.myFlattenedFiles removeAllObjects]; [self.myFlattenedNodes removeAllObjects]; [self.myIndexDict removeAllObjects]; [nodeArray removeAllObjects]; for (SDNode *rootnode in self.rootNodes) { [nodeArray addObject:rootnode]; [self.myIndexDict setObject:[rootnode indexPath] forKey:[[[rootnode representedObject] representedObject] fullpathL]]; for (SDNode *node in [rootnode childNodes]) { if (node.isLeaf){ [nodeArray addObject:node]; [self.myIndexDict setObject:[node indexPath] forKey:[[[node representedObject] representedObject] fullPathCopy]]; } else { [nodeArray addObjectsFromArray:[self descendants:node]]; [self descendantsIndex:node]; } } } [self.myFlattenedNodes setArray:[nodeArray copy]]; for (SDNode *node in self.myFlattenedNodes) { [self.myFlattenedFiles addObject:[[node representedObject] representedObject]]; } } </code></pre>
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    1. POHow to efficiently flatten a NSOutlineView?
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    1. USTrond Kristiansen
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    1. COCan u send the treeController demo code. Because we stuck with here. We are parsing the directories, need to display in tree view. Example app. thanks.
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    2. CO@user2553442: Please see my updated answer. Hope this helps. T
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    3. CODo u have sample code of this NSOutlineView.. @Trond Kristiansen
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