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

To avoid the Parse issue: 'aVariable' used as the name of the previous parameter rather than as part of the selector you get from the compiler as a warning you should do:

- (void)printWithParameter:(BOOL)sv color:(NSColor *)color{
   // your cool code goes here
   if ( sv ) {
      NSLog(@"cool stuff turned on");
   }
   else {
      NSLog(@"cool stuff turned off");
   }
}

and you could call the method, such:

[self printWithParameter:NO color:[UIColor someColor]] // NO instead of 0

or

[self printWithParameter:YES color:[UIColor someColor]] // YES instead of 1