Okay, I have done this, and things are compiling and running
correctly. Thank you. Two additional questions then. First, I still
get the warning that the superclass "may not respond" to the method
(and to be sure, it is only implemented in the subclass, but the
superclass calls it after a conformsToProtocol: check). Second, I
would like the optionalMethodToImplement to be private - usually I put
this in the .m file under a category; but when I do that with the
protocol, the subclass cannot locate the protocol. Any suggestions?
On 28-Apr-08, at 5:32 PM, Michael Vannorsdel wrote:
You can specify that a class adopts a protocol by defining it as:
@interface ClassB : ClassA <Check>
{
...
}
...
@end
This will tell the compiler that ClassB implements the Check
protocol. You can put multiple protocols by separating them with a
comma:
@interface ClassB : ClassA <Check, someotherproto>
{
...
}
...
@end
This will stop compiler warnings and will also warn if a class you
defined to use the protocol doesn't have an implementation for the
method(s) in that protocol.
On Apr 28, 2008, at 6:00 PM, K. Darcy Otto wrote:
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:
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