On Jun 19, 2011, at 2:14 PM, Ken Tozier wrote: > On Jun 19, 2011, at 3:57 PM, Kyle Sluder wrote: > >> You're setting the contents property of the layer. So returning nil >> from -actionForKey: should do the trick. I just found this post by >> Matt Neuburg that might explain why you're having trouble: >> http://www.cocoabuilder.com/archive/cocoa/293161-calayer-instant-content-update.html >> >> Basically, the sentinel value that tells Core Animation to stop >> looking for an action to apply to a property change is NOT nil, as >> implied by the documentation and David Duncan's post. Rather, it is >> NSNull. "nil" means "I don't have an answer for you; consult someone >> else," which can be the layer _or_ the default set of implicit >> actions! Rather, try returning [NSNull null] from your -actionForKey: >> override. > > I read the link and tried both of the following: > > - (id) actionForKey:(NSString *) inKey > { > if ([inKey isEqualToString: @"contents"]) > return [NSNull null]; > > return [super actionForKey: inKey]; > } > > Produced the error: > -[NSNull runActionForKey:object:arguments:]: unrecognized selector sent to > instance 0x7fff701d5fa0
Which value is the sentinel depends on context, hence my recommendation to read the documentation. Specifically when using the actions dictionary, style dictionary or -actionForLayer:forKey: the sentinel is [NSNull null] and nil/non-existant means "keep searching". In other contexts nil means "no action". > Thanks again for the reply it cleared some things up. At this point though, > it's probably a good time to put CALayers aside, at least for now. The > inability to simply set the shape of the layer and turn off the blasted > animations, when needed, is a deal breaker for me. Not sure why Apple made it > so squirrely, but really, the entire point of my subclass was to make it > possible to do something like the following. You probably aren't overriding enough properties default animations. As stated, @"contents" is literally only the bitmap backing the layer. It does not affect any other animation the layer may perform. From the sounds of it, you also have a border and the cornerRadius set to a non-zero value. If you want to disable those animations too, you need to disable them for those associated keys too. Or you can use the CATransaction as you originally tried, but you need to do it around the values that you are actually changing. @"contents" is a bit special because it is typically set outside of your control, but other properties tend no to be. -- David Duncan _______________________________________________ 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
