Optional arguments in Objective-C 2.0?

Question

In Objective-C 2.0, is it possible to make a method where the argument is optional? That is, you can have a method call like this:

[aFraction print];
         


        

Answer 1

Another option for multiple optional arguments is to pass them all in an NSDictionary:

- (void)someMethodWithOptions:(NSDictionary *)options;

then declare that the options dictionary may contain:

- key1, value must be a BlahObject
- key2, value must be a NonBlahObject

you can then allow any of the keys to be absent and even the dictionary itself could be nil.