Question

I have a method which is implemented in its super method. And when I run my program. It works fine. How do I suppress this warning? By the way, both methods are in ‘.m’ file.

The code is like this:

ClassA.m

@interface ClassA()
- (void)method;
@end

ClassA.h

@interface ClassA : ClassB
@end

ClassB.m

@interface ClassB()
@end
@implementation ClassB
- (void)method
{
}

And it works OK when I call method in ClassA

Answer 1

You’ve got it completly wrong. Popular construction is to have:

ClassB.h

@interface ClassB
- (void)method;
@end

ClassB.m

@interface ClassB()
@end
@implementation ClassB
- (void)method
{
    //do nothing or even assert false
}
@end

ClassA.h

@interface ClassA : ClassB
@end

ClassA.m

@interface ClassA()
@end
@implementation ClassA
- (void)method
{
    //do your stuff here
}
@end

And that’s called method overriding. But if I correctly understand what you are trying to achieve you should have:

ClassB.h

@interface ClassB
- (void)method;
@end

ClassB.m

@interface ClassB()
@end
@implementation ClassB
- (void)method
{
    //do your stuff here
}
@end

ClassA.h

@interface ClassA : ClassB
@end

And there is no need to mess up with ClassA, and you can call

ClassA *o=[[ClassA alloc ] init];
[o method];

Then the method is available in classA thanks to inheritance from ClassB.