Adding a binding (in IB) prevents instance variables

[parzival@…]

I've got a (MacRuby) subclass of NSWindowController. If a binding is added using Interface Builder, it becomes impossible to have any instance variables in my subclass. What's kind of strange, too, is that removing the binding doesn't fix it; so far it seems necessary to delete the object in IB and then re-create it.

I'm using r2771, on a MBP(2007) running 10.6.1. This was working at some point in 0.4, but I think it's been broken for at least a couple weeks or more.

Here's some code in my class to demonstrate. This gets called in awakeFromNib, though I tried adding an instance variable in initWithWindow and it came back nil as well :

testSPC = SourcePaneController.new
puts "testSPC:"
p testSPC
@testSPC_iv = SourcePaneController.new
puts "@testSPC_iv:"
p @testSPC_iv

testInt = 3
puts "testInt:"
p testInt
@testInt_iv = 5
puts "@testInt_iv:"
p @testInt 
	
puts "Instance variables are :"
p self.instance_variables

And the output:

in MainWinController.initWithWindow
in SourcePaneController.init
testSPC:
#<SourcePaneController:0x2003df0a0>
in SourcePaneController.init
@testSPC_iv:
nil
testInt:
3
@testInt_iv:
nil
Instance variables are :
[]

As can be seen, the calls to my other class's initializer are working, but it's not getting assigned to the instance variable. A potentially revealing error occurred when I mistyped one of my test variable names. This is what happens after ' @testSPC_iv = nothing' (where 'nothing' is an unassigned variable) :

2009-10-09 12:22:01.975 resynch[1015:a0f] +[MainWinController _getValue:forKey:]: unrecognized selector sent to class 0x200238940
2009-10-09 12:22:01.978 resynch[1015:a0f] +[MainWinController _getValue:forKey:]: unrecognized selector sent to class 0x200238940
2009-10-09 12:22:01.979 resynch[1015:a0f] An uncaught exception was raised
2009-10-09 12:22:01.979 resynch[1015:a0f] +[MainWinController _getValue:forKey:]: unrecognized selector sent to class 0x200238940
2009-10-09 12:22:01.981 resynch[1015:a0f] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '+[MainWinController _getValue:forKey:]: unrecognized selector sent to class 0x200238940'
*** Call stack at first throw:
(
	0   CoreFoundation                      0x00007fff83dbf5a4 __exceptionPreprocess + 180
	1   libobjc.A.dylib                     0x00007fff87c7c313 objc_exception_throw + 45
	2   CoreFoundation                      0x00007fff83e18330 __CFFullMethodName + 0
	3   CoreFoundation                      0x00007fff83d9230f ___forwarding___ + 751
	4   CoreFoundation                      0x00007fff83d8e458 _CF_forwarding_prep_0 + 232
	5   CoreFoundation                      0x00007fff83d53ffd CFDictionaryGetValueIfPresent + 93
	6   libmacruby.dylib                    0x000000010010b4ee classname + 126
	7   libmacruby.dylib                    0x000000010010b728 rb_class_path + 24
	8   libmacruby.dylib                    0x000000010010ba3e rb_obj_classname + 46
	9   libmacruby.dylib                    0x000000010006f89f rb_any_to_string + 15
	10  libmacruby.dylib                    0x000000010015f697 rb_vm_call_with_cache2 + 4663
	11  libmacruby.dylib                    0x0000000100121199 rb_funcall + 425
	12  libmacruby.dylib                    0x000000010015f697 rb_vm_call_with_cache2 + 4663
	13  libmacruby.dylib                    0x0000000100121199 rb_funcall + 425
	14  libmacruby.dylib                    0x000000010006a8f6 rb_inspect + 22
	15  libmacruby.dylib                    0x000000010003e2a1 name_err_mesg_to_str + 161
	16  libmacruby.dylib                    0x0000000100162d6f rb_vm_call + 4783
	17  libmacruby.dylib                    0x0000000100070df9 rb_convert_type + 121
	18  libmacruby.dylib                    0x00000001000f010b rb_string_value + 107
	19  libmacruby.dylib                    0x000000010003c62e name_err_to_s + 78
	20  libmacruby.dylib                    0x000000010015f697 rb_vm_call_with_cache2 + 4663
	21  libmacruby.dylib                    0x0000000100121199 rb_funcall + 425
	22  libmacruby.dylib                    0x0000000100162d6f rb_vm_call + 4783
	23  libmacruby.dylib                    0x0000000100175e23 rb_vm_print_current_exception + 99
	24  libmacruby.dylib                    0x0000000100176108 macruby_main + 392
	25  resynch                             0x0000000100000e3e main + 40
	26  resynch                             0x0000000100000ad8 start + 52
	27  ???                                 0x0000000000000001 0x0 + 1
)
terminate called after throwing an instance of 'NSException'
Program received signal:  “SIGABRT”.

[lsansonetti@…]

Matthias Neeracher was kind enough to contribute some KVO specs that were reproducing your crash, and I fixed the bugs in r2778. Please give it a try again and let us know if you still have problems.