Arguments by reference in Objective-C

Question

I\'m trying to pass an NSString by reference but it doesn\'t work.

This is the function:

+(void)fileName:(NSString *) file
{
    file =          


        

Answer 1

I believe you're looking for:

+ (void)fileName:(NSString **)file
{
  *file = @"folder_b";
}

What's really done here is we're working with a pointer to a pointer to an object. Check C (yup, just plain C) guides for "pointer dereference" for further info.

(...But as has been pointed out repeatedly, in this particular example, there's no reason to pass by reference at all: just return a value.)