Dennis,
If any of your layers are autoreleased and not explicitly retained, if
you try to access them again, you will get a crash. Can you show us
what your functions such as updateRemovedSublayer look like (I'm
assuming that's yours)? If you are calling [CALayer setSublayers:nil]
and then try to access one of the layers that was in the previous
array, it will crash as they have been released. If you allocate your
layers with alloc init, you will still have a reference to the layer.
Then, when it is removed from the parent layer, you can still access
it. On the other side of that, though, you will need to explicitly
release the object when you are done.
Best regards,
-Matt
On Jan 12, 2009, at 1:57 PM, Dennis Christopher wrote:
Dave,
Thanks for the pointer. I had corrected the original array
enumeration error, and forgotten. But no matter how I try to access
a sublayer I seem to have a problem.
When I now try your suggestion I still get a crash. The call stack
shows, in order of execution:
[CALayer setSublayers:]
CALayerUpdateSublayers
updateRemovedSublayer
CALayerMarkVisible
.
.
objc_msgSend (EXC_BAD_ACCESS)
Can you suggest what might be wrong?
Dennis Christopher
On Jan 10, 2009, at 12:43 PM, David Duncan wrote:
On Jan 9, 2009, at 12:19 PM, Dennis Christopher wrote:
NSArray *theLayers = [[self layer] sublayers];
for(CALayer *layer in sublayers) {
[layer removeFromSuperlayer];
I'm new to CALayer and at a loss as to what could be wrong with
this.
Any suggestions would be appreciated.
(I've read through most of Dudney's Core Animation book but nothing
jumps out at me.)
I would suspect that you'd see a message on the console to the effect
of "modifying an array while enumerating it". I think you can replace
this more simply by just doing [[self layer] setSublayers:nil].
--
David Duncan
Apple DTS Animation and Printing
_______________________________________________
Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/cocoa-dev/matt.long%40matthew-long.com
This email sent to matt.l...@matthew-long.com
_______________________________________________
Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
Please do not post admin requests or moderator comments to the list.
Contact the moderators at cocoa-dev-admins(at)lists.apple.com
Help/Unsubscribe/Update your Subscription:
http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com
This email sent to arch...@mail-archive.com
