Question

I am a objective C newbie. Why do i get a warning for calling a func i created in a category?

#import <stdio.h> #import <objc/Object.h>  @interface MyObj: NSObject { @public     int  num; }  -(void) print; @end  @implementation MyObj; -(void) print {     printf('%d\n', self->num); } @end  @implementation MyObj(more) -(void) quack {     printf('Quack\n'); } @end   int main (int argc, char *argv[]) {     MyObj  *obj = [[MyObj alloc] init];     obj->num = 9;     [obj print];     [obj quack]; //warning my not respond to quack      [obj release];  } 

Answer 1

You need to declare the interface for MyObj(more), eg.

@interface MyObj(more) -(void)quack; @end