objective c - Should I need to unbind cocoa-bindings in dealloc of windowController? -

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i have window controller , view controller use core data bindings, want able have views really, deallocated. want reset managedobjectcontext , @ point have given memory possible.

i have found required unbind things i've bound in nib, or moc keeps nib objects retained.

the issue exec_bad_access trace:

enter image description here

if not unbind of bindings, created in interface builder, reset on moc causes exec_bad_access because bindings attempting reflect changes in moc in view that's gone, through array controller should gone, isn't.

so did in window controller's dealloc:

- (void) dealloc  {     nslog(@"wincon dealloc");     @autoreleasepool {         // remove subview ensure subview dealloc         [_viewcontroller.view removefromsuperviewwithoutneedingdisplay];          // tear down bindings ensure moc can reset         (nsobject<nskeyvaluebindingcreation>* object in              @[_watcherac, _watcherstimestreecontroller, _watchertableview, _itemsoutlineview])         {             (nsstring* binding in [object exposedbindings])                 [object unbind:binding];         }     } }

which triggered way:

- (void) switchtobackgroundmode {     nslog(@"switchtobackgroundmode");      // hide menu , dock icon     [nsapp setactivationpolicy:nsapplicationactivationpolicyaccessory];      // force every view deallocate before reset     @autoreleasepool {         // need check loaded prevent closing closed window ,         //  triggering second call applicationshouldterminateafterlastwindowclosed         if ([self.wincon iswindowloaded]) [self.wincon close];         self.wincon = nil;     }      nslog(@"about resetcoredatastack");     [self resetcoredatastack]; }

... , don't errors resetcoredatastack

the stack trace above comes log file this:

2014-05-29 15:54:35.794 myapp[10230:303] switch bg in appshouldterminate 2014-05-29 15:54:35.794 myapp[10230:303] switchtobackgroundmode 2014-05-29 15:54:35.808 myapp[10230:303] wincon dealloc 2014-05-29 15:54:35.830 myapp[10230:303] resetcoredatastack 2014-05-29 15:54:35.830 myapp[10230:303] reset core data {exception thrown iff wincon dealloc doesn't unbind everything}

and window controller dealloc called when it's nilled in autoreleasepool, moc reset causes exec_bad_access unless wincon dealloc unbind on bunch of crap in nib.

so question is:

given nib owned custom window controller (self.wincon) arraycontroller objects bound external managedobjectcontext, needs done force in nib released , unbound? there step i'm missing causes me have unbinding manually?

[edit] new debug code:

nslog(@"wincon dealloc");  @autoreleasepool {     // remove subview ensure subview dealloc     [_viewcontroller.view removefromsuperviewwithoutneedingdisplay];     _viewcontroller = nil;      self.window = nil; }  @autoreleasepool {      // tear down bindings ensure moc can reset     (nsobject<nskeyvaluebindingcreation>* object in          @[_watcherac, _watcherstimestreecontroller, _watchertableview, /*_itemsoutlineview*/])     {         nslog(@"bindings %@", [object classname]);         (nsstring* binding in [object exposedbindings]) {             nslog(@"bi %@: %@", binding, [object infoforbinding:binding]);             [object unbind:binding];         }     }

the log below bindinginfo bindings still alive when dealloc called windowcontroller

 2014-05-29 21:00:39.967 salewatch[11249:303] wincon dealloc  2014-05-29 21:00:39.975 salewatch[11249:303] bindings nsarraycontroller  2014-05-29 21:00:39.978 salewatch[11249:303] bindings nstreecontroller 2014-05-29 21:00:39.989 salewatch[11249:303] bi contentset: {     nsobservedkeypath = "selection.fetchtimesforoutlineview";     nsobservedobject = "[entity: swwebstorewatcher, number of selected objects: 1]"; }  2014-05-29 21:00:39.991 salewatch[11249:303] bindings nstableview 2014-05-29 21:00:39.991 salewatch[11249:303] bi selectionindexes: {     nsobservedkeypath = selectionindexes;     nsobservedobject = "[entity: swwebstorewatcher, number of selected objects: 1]"; } 2014-05-29 21:00:40.001 salewatch[11249:303] bi content: {     nsobservedkeypath = arrangedobjects;     nsobservedobject = "[entity: swwebstorewatcher, number of selected objects: 1]"; }  2014-05-29 21:00:40.020 salewatch[11249:303] resetcoredatastack

i forced wincon.window = nil in new code, , these 3 objects still aren't nil, though outlineview treecontroller did become nil. there retain cycle here, don't see how it'd fault... yet.


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