In an app running in Mac OS X 10.8, I have set a drawer's delegate to be its
window controller, in the window controller's -awakeFromNib…
- (void)awakeFromNib {
…
[drawer setDelegate:self] ;
…
}
About a week or so, I find the drawer behaving as though -drawerDidOpen: was
not being received by the window controller. This happened today. I placed a
breakpoint at the entry to -drawerDidOpen:, opened and closed the drawer
several times, and got no breaks. So I sent some messages via lldb to get the
address of the drawer…
(lldb) po [[NSApp delegate] inspectorController]
(id) $0 = 0x0000000108213bc0 <InspectorController: 0x108213bc0>
(lldb) po [$0 window]
(id) $1 = 0x0000000108186bc0 <NSPanel: 0x108186bc0>
(lldb) po [$1 drawers]
(id) $2 = 0x0000000100d3c4b0 <__NSArrayI 0x100d3c4b0>(
<NSDrawer: 0x10829e840>,
<NSDrawer: 0x108254e30>
)
…
<Sent more messages to drawer's content to see which of the two is the
misbehaving one. It was the second one.>
…
(lldb) po [0x108254e30 delegate]
(id) $4 = 0x0000000108213bc0 <InspectorController: 0x108213bc0>
Looks OK. So I then set the delegate to nil, and then re-set it back to the
window controller…
(lldb) expr (void)[0x108254e30 setDelegate:nil]
<no result>
(lldb) po [0x108254e30 delegate]
(id) $8 = 0x0000000000000000 <nil>
(lldb) expr (void)[0x108254e30 setDelegate:$4]
<no result>
(lldb) po [0x108254e30 delegate]
(id) $9 = 0x0000000108213bc0 <InspectorController: 0x108213bc0>
and, voila, upon opening the drawer, my breakpoint in -drawerDidOpen: broke,
and the drawer started behaving as expected.
My conclusion is that there is an intermittent bug in Mac OS X, that sometimes
-[NSDrawer setDelegate:] doesn't flip all of its switches. I've now tried to
work around this by resending -setDelegate: to the drawer like this
[drawer setDelegate:self] ;
[drawer performSelector:@selector(setDelegate:)
withObject:self
afterDelay:3.0] ;
The delay of 3 seconds I pulled out of the air. I have no idea what I'm doing
and cannot test since the problem is not reproducible.
(My app delegate retains the window controller, so this does not crash if user
closes the window within 3 seconds after opening it.)
Has anyone else ever seen such misbehavior by NSDrawer? Are there any other
possible explanations?
Thanks,
Jerry Krinock
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