how to block a superclass method to be called to a subclass

Question

I\'m extending the functionality of a class with a subclass, and I\'m doing some dirty stuff that make superclass methods dangerous (app will hang in a loop) in the context

Answer 1

note: I'm ObjC/Cocoa newcomer:

@implementation MyClass
-(void)myMethod:(NSString *)txt{
    if([self class] != [MyClass class]) return;
    NSLog(@"Hello");
}
@end

Peter