问在react中，当我路由到另一个页面时，useReducer存储将丢失状态。useContext只加载初始状态

EN

type Action2 =
   {
      type: "ON";
      payload: boolean;
    }
  | {
      type: "OFF";
      payload: boolean;
}


type State2 = {
  isLoggedIn: boolean
};

const reducer2 = (state: State2, action: Action2): State2 => {
  switch (action.type) {
    case "ON":
      return {
        isLoggedIn:true
      };
    case "OFF":
      return {
        isLoggedIn:false
      };
    default:
      return state;
  }
};


const initialState: State2 = {
  isLoggedIn: false
};

const [state2, dispatch2] = React.useReducer(reducer2, {"isLoggedIn":false});

<Button onClick={()=>dispatch2({type:"ON",payload:true})}>
            ON
          </Button>
           <Button onClick={()=>dispatch2({type:"OFF",payload:true})}>
            OFF
          </Button>

<Route exact path="/:id" >
<MyContext.Provider value={[state2, dispatch2]}>
            <React.Fragment>
                <PatientPage settingpatient={fetchPatient} context={context}/>
            </React.Fragment>
            </MyContext.Provider>
</Route>  

const theme2 = React.useContext(MyContext);