Comments on: Using NSTreeController

By: Elise van Looij

Elise van Looij — Sat, 14 Mar 2009 14:44:50 +0000

Ernest, you need to set the Value Transformer (in IB under the Value property) on your NSButtonCell, NSNegateBoolean, if I’m not mistaken and if the value of the cell is an integer.

By: Jonathan

Jonathan — Tue, 24 Feb 2009 09:39:59 +0000

Hi Ernest,

There could be an issue with incorrect bindings. What I did in my example was to bind the NSValueBinding (”Value” in IB) of the table column to the tree controller’s arrangedObjects.displayName keyPath. My first thought is that, as the NSValueBinding of the NSButtonCell refers to the on/off state of the button, the binding is turning them on if the bound string is not nil.

Not sure how you would solve this one as there are two values you need to consider here, the value and the label. This should be possible with bindings, but I’d do a long search on the cocoa-dev mailing list from Apple, this kind of thing comes up regularly.

By: Ernest

Ernest — Thu, 19 Feb 2009 16:32:28 +0000

Jonathan, thank you so much for this example. I have successfully implemented it into my project, but now I have a question for you. Maybe I am just not doing something right, but here it is: I added an Outline View to my window, which comes with the standard NSScrollView -> NSOutlineView -> NSTableColumn -> NSTextFieldCell. This works perfectly with my Tree Controller. However, when I change the NSTextFieldCell to use the check box cell (NSButtonCell) and run the application I get nothing but “Check” for my list? Am I missing something with the node in which I have to change to support NSButtonCell vs NSTextFieldCell?

By: Jonathan Dann

Jonathan Dann — Sat, 05 Jul 2008 19:28:34 +0000

@Ralph

Sorry I’m afraid I don’t have anything prepared. The example app on katidev uses an NSOutlineView, so I’d just create an NSTreeController in that NIB and connect it up as I’ve described in this article.

Jon

By: Jonathan Dann

Jonathan Dann — Sat, 05 Jul 2008 19:27:56 +0000

@ Ralph,

Jon

By: Ralph

Ralph — Sat, 05 Jul 2008 18:35:19 +0000

Hey Jonathan,

do you have a sample Application which combines your ESNode and XSController?

By: Jakob Dam Jensen

Jakob Dam Jensen — Sat, 05 Jul 2008 15:15:46 +0000

Thank you so much for this Jonathan - I’ve been trying to get something to work for the last two days, and somehow it all makes sense to me now - thanks to you.

Take care…

By: Jonathan Dann

Jonathan Dann — Sat, 07 Jun 2008 16:30:07 +0000

Not at all, I wrote this to help people!

By: Michael

Michael — Fri, 06 Jun 2008 17:50:48 +0000

Ah, indeed, now everything makes sense. Thanks for your patience, that explains a lot.

By: Jonathan Dann

Jonathan Dann — Thu, 05 Jun 2008 23:20:10 +0000

@”File’sOwner.treeController.arrangedObjects.nodeName” will return an NSArray of node names. The same happens when you have an NSArray and you call [myarray valueForKey:@"key"] the returned array contains the values for those keys.