Question

Does anyone know the best way to check to see if an optional protocol method has been implemented.

I tried this:

if ([self.delegate respondsToSelector:@selector(optionalProtocolMethod:)] ) 

where delegate is:

id<MyProtocol> delegate; 

However, I get an error saying that the function respondsToSelector: is not found in the protocol!

Answer 1

respondsToSelector: is part of the NSObject protocol. Including NSObject in MyProtocol should solve your problem:

@protocol MyProtocol <NSObject>  @optional -(void)optionalProtocolMethod:(id)anObject;  @end