[MacRuby-devel] How do I subclass Obj-C classes in MacRuby?

[Matt Aimonetti]

In general it's just better and simple to follow Cocoa's conventions and
never overwrite the default initializer but instead create your own
initializer.
Thibault explained some of the reasons why you are running into some issues
but the point is that even though MacRuby is a Ruby implementation, you are
still dealing with Cocoa Objects and Cocoa objects are designed a certain
way and you have to respect that if you want them to work properly.

-= Matt

On Fri, May 7, 2010 at 2:15 AM, Terry <tvmoore at mac.com> wrote:

> I agree on that point of course they are different calls .... but from a
> ruby point of view WHY isn't init with no args the same as initialize with
> no args....
>
> So I can live with it but my preference is with ruby initialize... this is
> macRuby right?
>
> Terry
> On 7/05/2010, at 6:09 PM, Thibault Martin-Lagardette wrote:
>
> Hi!
>
> I totally agree that it is a little confusing. But #new an #new(owner) are
> two different methods, especially in Obj-C.
> Calling A.new(arg) cannot call -init, since -init doesn't take any
> argument, so it will call any initializer method that takes one argument
> :-).
> This is why:
>
> class A; def initialize; end; end; # Will never be called with A.new,
> because -init will be called instead
> class A; def initialize(str); end; end; # Will be called with A.new(str),
> because -init cannot be called
>
> It simply depends on how you define your initilizer method :-)
>
> --
> Thibault Martin-Lagardette
>
>
>
> On May 6, 2010, at 21:54, Terry Moore wrote:
>
> This is only true if you follow objc init I think... for example...
>
>
> I came across this problem with NSWindowController and it took me a while
> to figure out.
>
> class PasswordController < NSWindowController
> def initialize
>     initWithWindowNibName("Password")  ##FAIL Never called! init called
> instead
> end
>
> class PrefController < NSWindowController
>
>   def initialize(owner)
>     @owner = owner
>     initWithWindowNibName("Preferences")
>   end
> end
>
>
> The first example fails and so I finally got that I needed the init method
> to make the window appear but I couldn't figure out why the second option
> worked.
>
> Must have been a long day but clearly if designate an initialize with a
> param init is bypased...
>
> so if I take the
> class A <String
>   def initialize(b)
>      super
>   end
> end
>   example and do A.new("hi there") gives
>
> initialize
> => "hi there"
>
> so what is going on? I think there might need to be some clarity.....
>
> Terry
>
>
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