Why tack a protocol of NSObject to a protocol implementation

Question

I have been seeing some code around that resembles the following:

@protocol MyProtocol 
// write some methods.
@end

Is ther

Answer 1

It's also very handy when you have protocols that have @optional methods (e.g. "modern" Objective-C 2.0 delegates often use this technique) If you don't include the NSObject protocol, you'll get warnings when you try to call respondsToSelector: on the object.