objective c - instance method not found when using more than one parameter -

My question is about the situation where things are fine for a method with a parameter, but for two No. The code comes from Apple Animation Sample Code.

The main visual object, (self), is the reference reference only to an abstract superclass object, s.

This is an instance obtained from such a superlace:

  [self.s myMethod: param1];   
 And it works fine.  
 However, when I try:  
  [self.s anothermethod: param1 secondParam: param2];   
 I get a compilation error:  
 
 semantic digits> Example method 'Onsmuth: Seconds:' Not found (Return type defaults for 'ID')   
 The type of return in both methods is - (zero).  
  
 Any suggestion would be appreciated.  
 (I really do not want to resort to adding standards to an object!)  
 
 Revision with the example below  
 These types of announcements include superclass files and inherited classes  
 class for super:  
  @interface superclass: NSObject {...} ... - (zero Mymethod: (SomeObject *) param1; - (zero) another method: (some object *) param1: (int) param2; @end   
 For an Inherited Class:  
  #import "SuperClass.h" @ Interface Inherited Class: Super Class {...} ... - (zero) myMethod: (SomeObject *) param1; - (zero) another method: (some object *) param1: (int) param2;   
 Implementation in each file's M file  
 has tried to add it to the inherited class .m file.  
  @ interface inherited class () - (zero) another method: (some objects *) param 1: (int) absolute 2; @end    
 
 
 This call:  
  [self . Another method: the ultimate 1 second paramaram: the ultimate 2];   
 ... means method name  another method: second paragraph: .  
 This announcement:  
  - (zero) another method: (some object *) param1: (int) param2;   
 ... does not have the same name.  
 Is it possible that you say:  
  - (zero) another method: (some object *) param1 secondParam: (int) param2;   
?