objective c - What can't be stored in NSDictionary? -

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i have online quiz trying complete , question:

one of following can't stored in nsdictionary. can't stored because _____ type:

uiview nsnumber nsinteger uicolor

fill in in blank.

i can't seem find answer anywhere online. far can tell have way of being stored in nsdictionary, ideas?

nsinteger! because it's primitive type


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