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

Slightly related you can have optional arguments. Meaning you can call a method with any number of arguments if you like. But that is a feature from C (varargs).

An example, is the NSArray message:

+ (id)arrayWithObjects:(id)firstObj, ...

Example of usage:

NSArray *myArray;
NSDate *aDate = [NSDate distantFuture];
NSValue *aValue = [NSNumber numberWithInt:5];
NSString *aString = @"a string";

myArray = [NSArray arrayWithObjects:aDate, aValue, aString, nil];

This is straight from the Apple docs. You indicate the end of all your arguments with a nil.