Accessing category method in original Objective C class - objective-c

Question

I have a class for which I have created a category. Now I want to access category method inside original class but I am getting error:
error: instance method '-hasSound' not found (return type
defaults to 'id') [-Werror,-Wobjc-method-access]
// Animal.h
#interface Animal: NSObject
- (void)sound;
#end
// Animal.m
#import "Animal+Additions.h"
#implementation Animal
- (void)sound {
[self hasSound];
}
#end
// Animal+Additions.h
#interface Animal (Additions)
- (BOOL)hasSound;
#end
// Animal+Additions.h
#implementation Animal (Additions)
- (BOOL) hasSound {
return YES;
}
#end
I have been doing same thing in Swift but not sure how to achieve the same thing in Objective C.
Category and original class are in separate files. I have imported Category interface file inside original class but that didn't work.

Answer 1

You have not shown sufficient #import statements, so I have to assume they don't exist. You need them.
Another possible issue is that, at least according to your comments, you seem to have two Animal+Additions.h files but no Animal+Additions.m file.
This complete code in four files compiles for me:
// Animal.h
#import <Foundation/Foundation.h>
#interface Animal: NSObject
- (void)sound;
#end
// Animal.m
#import "Animal.h"
#import "Animal+Additions.h"
#implementation Animal
- (void)sound {
[self hasSound];
}
#end
// Animal+Additions.h
#import "Animal.h"
#interface Animal (Additions)
- (BOOL)hasSound;
#end
// Animal+Additions.m
#import "Animal+Additions.h"
#implementation Animal (Additions)
- (BOOL) hasSound {
return YES;
}
#end
Note all the #import statements, and note that the Animal.m file must be part of the target.