Because NSDictionary requires keys to be copyable because it copies them
(it's in the documentation). Use a CFDictionary() instead, you can set
it up to retain the keys and do what you want.
Rick Mann 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?
TIA,
Rick
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