我们也有类似的实现，因此希望可以解决您的问题.

We have similar implementation, so hopefully this solves your problem.

if let currentUser = Auth.auth().currentUser {
    currentUser.getIDTokenForcingRefresh(true) { error in
        if let error = error {
            // log out
        } else {
            // go in
        }
    }
} else {
    // log in
}

这会强制Auth与Firebase通信以获取新的身份验证令牌，如果删除了用户，该令牌将失败.

This forces Auth to communicate with Firebase to get a new authentication token, which would fail if the user was deleted.