NSError has a userInfo which is a dictionary. I would like to have a custom NSErrorUserInfoKey. I thought of a category for the NSError where I can define that key as a constant string. I know that I can't have properties in categories but is it possible and correct to add a constant to a category?
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h3dkandi
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The keys are strings aren't they, so see [this answer](https://stackoverflow.com/a/539191/299924). – trojanfoe Oct 08 '19 at 12:54
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Yes but is it ok to add them on a category? – h3dkandi Oct 08 '19 at 13:37
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1Does it have a `.h` and `.m` file? If so, then yes. – trojanfoe Oct 08 '19 at 13:38
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Thanks that would probably do then. – h3dkandi Oct 11 '19 at 12:25
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Yes we have option to add properties in category using
objc_setAssociatedObject
and
objc_getAssociatedObject
objc_setAssociatedObject is used to set the value
objc_getAssociatedObject is used to ge the value
About constants I would create another class for constant FOUNDATION_EXPORT and use it here. Something like CustomErrorUserInfoKeys.h
shinoy
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