On Mon, Feb 1, 2010 at 3:05 AM, Rick Mann <rm...@latencyzero.com> wrote: > I'd like to use a CALayer object as a key in a dictionary. The reason is that > when my app detects a hit in a layer, I need to quickly determine which > object I've associated with it. Since I can't store a reference to an > arbitrary object in the CALayer, a dictionary seems to be the most expedient > way to do that. > > Unfortunately, I can't seem to add my layer as the key (it fails with > "-[CALayer copyWithZone:]: unrecognized selector sent to instance > 0x50132a0"). It's really pretty handy to be able to use any object as a key, > why is this not the case in Obj-C?
NSDictionary is not a generalized map, but is basically intended to store "value" objects. For a generalized map, you can use NSMapTable. It has a similar API but is more configurable. Mike _______________________________________________ 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
