I'm having difficulty working with bindings and I'm not sure if it's a MacRuby thing or my poor understanding of how they work.

I've tried binding to two types of things - an NSMatrix of radio buttons (binding to "selectedTag") and a Checkbox value.  

Using just an attr_accessor - the variable changes when the user changes them, but changing the variable doesn't update in the UI.

 

So I added an explicit setter method and to change the variable, I use self.setVideoSource(VID_USE_S2) to modify it.

This works to change it on-screen, but now UI changes aren't getting through to the variables properly.  The NSMatrix variable isn't changing, and the other variables are changing but are no longer Boolean.  (If I do a "p x" I get  either #<NSCFBoolean:0xa07f13f8> or #<NSCFBoolean:0xa07f1400>.

I tried replacing 'attr_accessor' with 'attr_reader', and adding an explicit getter. That results in the following when I run (even if I add a 'return nil' to my setter method):

[4169:10b] KVO autonotifying only supports -set<Key>: methods that return void. Autonotifying will not be done for invocations of -[MainWinController setVideoSource:].

I haven't yet tried manual notification because I'm not likely to use bindings for this case if that much work is required.  Is this the expected way to go, or am I missing something here?

Here's a bit of the code (these are set as keys in IB).  When used elsewhere, I just have them as the instance variable :

attr_accessor :audioIncludeS1 # whether to include audio

attr_accessor :audioIncludeS2 # for a particular channel

attr_accessor   :videoSource # which source to use (if any) for video

def setAudioIncludeS1(value)

    @audioIncludeS1 = value

end

def setAudioIncludeS2(value)

    @audioIncludeS2 = value

end

    

def setVideoSource(value)

    case value

        when VID_USE_S1

            @videoSource = VID_USE_S1

        when VID_USE_S2

            @videoSource = VID_USE_S2

        when VID_USE_NONE

            @videoSource = VID_USE_NONE

        else

            @videoSource = VID_USE_NONE

    end

end