How to create a protocol with methods that are optional?

Question

I noticed methods marked optional in several protocols defined in the iPhone SDK, such as the UIActionSheetDelegate protocol for example.

How can I defi

Answer 1

Use the @optional keyword before your method declaration to make it optional. Simple as that!

// myProtocol.h
@protocol myProtocol
- (void)myMandatoryMethod:(id)someArgument;
@optional
- (void)myOptionalMethod:(id)someArgument;
@end

// myClass.m
@interface myClass : someSuperClass 
    //...
@end