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Is it possible to have an NSdictionary where the keys are NSDates and also have it writeable/archiveable to disk?
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Not using property lists, as only string keys are allowed there. You should be able to write it using
NSKeyedArchiver, but that has the disadvantage of being a more opaque format. Alternatively, you could of course make a copy of the dictionary where you convert the dates to strings.Yes, this should work just fine - and NSDate elements are also suitable for plist encoding. Might depend on the value you put in as values, though.
If you experience problems, please update your question with code.