Question

how to assign object of interface to a protocol’s object?
i’ve a protocolA and protocolB. all the methods of both the protocols is implemented in MyClass.How to restrict the access to only protocolA’s methid and protocolB’s methods ?Coding is done in Objective-C for iPhone application.

Answer 1

On object creation you can just do this:

id <protocolA> protocolAObject = [[MyClass alloc] init];

Now, unless you use an explicit cast, you can’t use protocolB methods.

You can also cast objects of class MyClass to either protocolA or protocolB like this:

MyClass *myClassObject = [[MyClass alloc] init];
id <protocolB> protocolBObject = (id <protocolB>) myClassObject;