I need to have a subclass optionally extend a method already in the
superclass. After some research, my best guess is that an optionally
defined protocol is the best way to go about this. So, what I have in
the superclass is:
@interface ClassA : NSObject
{
...
}
...
@end
@protocol Check
@optional
-(BOOL)optionalMethodToImplement;
@end
Now, I don't want the superclass to implement it, so when it comes to
the actual method that needs to be extended, I do the following:
-(BOOL)checkMethod
{
... stuff ...
if ([self conformsToProtocol:@protocol(Check)])
[self optionalMethodToImplement];
}
Problem #1: The compiler complains that ClassA may not respond to
optionalMethodToImplement. Then I have:
@interface ClassB : ClassA
{
...
}
...
@end
@interface ClassB (private) <Check>
-(BOOL)optionalMethodToImplement;
@end
Problem #2: The compiler cannot find the protocol in the superclass.
I realise I could do the same thing by having a dummy method in the
superclass, and override that in the subclass. And I'm about to head
down that path; but it seems like there should be a way to do this
with protocols. Thanks in advance.
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