Mac OS X 10.5.5, Xcode 3.1.1, PowerBook G4.
I have developed a Document Based Cocoa application, and the main
document window contains a simple datasource based NSTableView. After
I recently re-built everything with Xcode 3.1.1, my application
crashes when I close any document window. Everything document,
datasource, tableview are instantiated in the NIB file that is owned
by the document object.
It took me some time to find out what is going on, anyway I am quite
sure that the reason for the crash is a premature dealloc of the
datasource of the NSTableView, in the course of closing the document
window. In order to prevent my application from crashing, I overwrote -
[NSObject dealloc] of the datasource to the following:
- (void)dealloc
{
return;
[super dealloc]; // this prevents the warning that
} // [super dealloc] is not called.
Unbelievable, but true - I checked this several times, that this
prevents my application from crashing.
Questions:
- what determines the order of dealloc of
NIB instances once a document closes?
- is it possible that this order changed
somehow between Xcode 3.1.1 and Xcode 3.1
- can I set the dealloc sequence somehow myself,
e.g. by dragging the objects of the NIB
into a certain order?
Probably not exactly related to this, I experience another issue of
premature dealloc, that also occurred only recently, without changing
any code of my application.
The document has one independent main document window and it can open
many dependent windows. When closing the main window, then the
document and with that the dependent windows are forced to close too (-
[MainDocWindowController setShouldCloseDocument:YES]). All of a
sudden, my application deallocs the document object and its instances
first, and then the dependent window objects. Also because of this my
application started to crash, because for cleaning up, the dependent
window objects are still needing to access some resources of the
document object, that unfortunately has been dealloced prematurely.
Any ideas, on how I can enforce the previous more logical dealloc
sequence - the dependent window objects first, then the main window
object, and finally the document object itself?
Many thanks for any response.
Best regards
Rolf Jansen
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