Gameplaykit GKState, swift func with two parameters

Question

I'm sure that is a simple question for you.

How can I write a func with two parameters with one GKState?

UPDATE

Apple use func willExitWithNextState(_ nextState: GKState)

If I use somefunc(state:GKState) works fine

while somefunc(state:GKState, string:String) does't work, why???

Other example

I've tried this:

class Pippo:GKState {}

//1
func printState (state: GKState?) {
    print(state)
}

printState(Pippo) //Error cannot convert value of type '(Pippo).Type' (aka 'Pippo.Type') to expected argument type 'GKState?'

//2
func printStateAny (state: AnyClass?) {
    print(state)
}
printStateAny(Pippo) //NO Error


//3
func printStateGeneral <T>(state: T?) {
    print(state)
}
printStateGeneral(Pippo) //No Error

//4
func printStateAnyAndString (state: AnyClass?, string:String) {
    print(state)
    print(string)
}

printStateAnyAndString(Pippo/*ExpectedName Or costructor*/, string: "Hello") //ERROR
printStateAnyAndString(Pippo()/*ExpectedName Or costructor*/, string: "Hello") //ERROR cannot convert value of type 'Pippo' to expected argument type 'AnyClass?'

SOLUTION THANKS @0x141E

func printStateAnyAndString (state: GKState.Type, string:String) {
    switch state {
    case is Pippo.Type:
        print("pippo")
    default:
        print(string)
    }
}

printStateAnyAndString(Pippo.self, string: "Not Pippo")

Thanks for reply

Answer 1

If you want a parameter to be a class, use Class.Type or AnyClass

func printState (state: AnyClass, string:String) {
    print(state)
    print(string)
}

and use Class.self as the argument

printState(Pippo.self, string:"hello pippo")

Update

If your function definition is

func printState (state:GKState, string:String) {
    if state.isValidNextState(state.dynamicType) {
        print("\(state.dynamicType) is valid")
    }
    print(state)
    print(string)
}

you'll need to pass in an instance of GKState (or a subclass of GKState) as the first argument, not the class/subclass itself. For example,

let pippo = Pippo()

printState (pippo, "Hello")