Creating method with indifinitive amount of arguments

Discussion in 'iOS Programming' started by exmorpheus, Mar 25, 2011.

  1. exmorpheus macrumors newbie

    Mar 19, 2011
    I noticed some array methods like initWithObjects or arrayWithObjects allow you to keep adding arguments until you pass a null argument. So I'm wondering how I would make something similar to that. I looked at the header file in which arrayWithObjects was declared and saw this:

    - (void)arrayWithObjects:(id *)firstObject, ... NS_REQUIRES_NIL_TERMINATION;
    I was wondering if I could do the same with my own methods and if so, how do I call the other arguments?
  2. scottgroovez macrumors regular

    May 20, 2010
    In other languages you'd parse an array of arguments. You've then just got to work out what to do with it.
  3. (marc) macrumors 6502a


    Sep 15, 2010
    the woods
    Use a va_list. It's how functions like printf (and the one you posted, as far as I can tell) work.

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