Why can't I use any object as a key in a dictionary?
Why can't I use any object as a key in a dictionary?
- Subject: Why can't I use any object as a key in a dictionary?
- From: Rick Mann <email@hidden>
- Date: Mon, 1 Feb 2010 00:05:45 -0800
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?
TIA,
Rick
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