'-respondsToSelector:' not found in protocol(s)

Question

I have received this message ever since I started building my first iPhone program several months ago.

I want to check if a delegate implements a given method. It works but I get this warning.

How can I do it the correct way?

Answer 1

The respondsToSelector: method is declared in the NSObject protocol. You have to make sure that your custom protocols also conform to the NSObject protocol. Change the declarations of your custom protocols from:

@protocol MyCustomProtocol ... @end 

to:

@protocol MyCustomProtocol <NSObject> ... @end