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

7 May 2010

      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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