How do i have to do to resolver for apollo-client when i cannot use localstorage?

I want to use JWT when user login my service. below my code show that if user get jwt from server, use localStorage.setItem. it works for desktop web, but it doesn't work, ios web. I think cache.writeData also doesn't work at ios web. I want to know other way to set jwt to storage for ios web.

export const defaults = {
  isLoggedIn: Boolean(localStorage.getItem("jwt"))
};

export const resolvers = {
 Mutation: {
    logUserIn: (_, { token }, { cache }) => {
      localStorage.setItem("jwt", token);
      cache.writeData({ data: { isLoggedIn: true } });
    },
    logUserOut: (_, __, { cache }) => {
      localStorage.removeItem("jwt");
      cache.writeData({ data: { isLoggedIn: false } });
    }
  }
};