protocol type-casting

ex1

if([self.myViewController conformsToProtocol:@protocol(MyProtocol)])
{
    id<MyProtocol> p = (id<MyProtocol>)self.myViewController;
    [p protocolMethod];
}


ex2

if ([self.myViewController conformsToProtocol:@protocol(MyProtocol)])
{
        UIViewController <MyProtocol> *vc = (UIViewController <MyProtocol> *) self.myViewController;
        [vc protocolMethod];
}