On May 16, 2013, at 11:41 PM, Graham Cox <[email protected]> wrote:
>> There is setValue:forUndefinedKey: and then each object could keep a local
>> dictionary of these "defined at runtime" keys.
>
> There are low-level runtime methods that allow you to add properties at
> runtime. I'm not sure whether that's considered good practice, but it's
> doable.
MYDynamicObject is a class I wrote that enables this:
https://github.com/snej/MYUtilities/blob/master/MYDynamicObject.h
You can subclass this, add properties to the @interface, and then mark them as
@dynamic in the @implementation. Then you just need to implement a generic
getter and setter method to do something like store the value in an internal
mutable dictionary.
(This is just like what NSManagedObject does with @dynamic properties, only in
a more generic form.)
—Jens
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