Delegates in objective c

Question

First I should tell you that ive little knowledge of Objective C or C#.So when one of my collegues asked me whether there is anything like delegates in Objective C,I wondere

Answer 1

C# delegates are something like NSInvocations in Objective-C:

• each knows the object that will be the target of the call
• each knows the method that will be called

however, an NSInvocation goes further:

• it knows the arguments to pass to the method
• it can store the return value

You probably wouldn't use NSInvocation to implement a pattern like C# delegates (which are a form of Proxy pattern). Personally I'd choose to use an object that forwards messages it receives to the target object, using the standard message-forwarding features of the runtime.