How to subscribe to multiple states separately in one class

ReSwift Version: 4.0.0

Problem: I have to listen to multiple sub-states separately in one class

Currently, i am doing it like:

class Sample: StoreSubscriber {
   init() {
         // MARK: Subscriber of state 1, 2
         appStore.subscribe(self) { state in
            state.select { state in (state.state1, state.state2) }
        }
   }

   // MARK: Listener for state 1, 2
   func newState(state: (state1: State1, state2: State2) ) {
       // process
   }

}

How can i listen to each sub-state separately, so that i can act on only sub-state which get changed??

SomethingLike:

class Sample: StoreSubscriber {
   init() {
         // MARK: Subscriber
         appStore.subscribe(self) { state in
            state.select { state in state.state1 }
        }

         appStore.subscribe(self) { state in
            state.select { state in state.state2 }
        }
   }

   // MARK: Listener for state1
   func newState(state: State1 ) {
       // process
   }

   // MARK: Listener for state2
   func newState(state: State2 ) {
       // process
   }

}