[MacRuby-devel] Key-value observing

Laurent Sansonetti lsansonetti at apple.com
Wed May 13 12:00:12 PDT 2009


Hi Jeremy,

That's a pretty good idea! Could you file a bug on the tracker so that  
we do not forget about it?

Thanks,
Laurent

On May 12, 2009, at 10:18 AM, Jeremy Voorhis wrote:

> Hello,
>
> I've been learning Cocoa, Objective-C and macruby in tandem and I was
> just wondering, are there any plans to integrate the key-value
> observing protocol with the attr_accessor family of methods? With a
> little experimentation, I found KVO is definitely possible with
> macruby, but the syntax is less than ideal (transcript made with the
> 0.4 release).
>
> ~ % macirb
>>> class Notifier
>>>  attr_accessor :value
>>> end
> => nil
>>> class Observer
>>>  def observeValueForKeyPath(path, ofObject:object, change:change,  
>>> context:context) puts change end
>>> end
> => nil
>>> n = Notifier.new
> => #<Notifier:0x8005e91a0>
>>> n.addObserver(Observer.new, forKeyPath:'value', options:0,  
>>> context:nil)
> => nil
>>> n.value = 42
> => 42
>>> n.setValue 42
> {"kind"=>1}
> => nil
>
> Best,
>
> Jeremy Voorhis
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> MacRuby-devel at lists.macosforge.org
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