Question

//Anom loggin
    auth.SignInAnonymouslyAsync().ContinueWith(task =>
    {
        if (task.IsCanceled)
        {
            Debug.LogError("SignInAnonymouslyAsync was canceled.");
            return;
        }
        if (task.IsFaulted)
        {
            Debug.LogError("SignInAnonymouslyAsync encountered an error: " + task.Exception);
            return;
        }

        Firebase.Auth.FirebaseUser newUser = task.Result;
        Debug.LogFormat("User signed in successfully: {0} ({1})", newUser.DisplayName, newUser.UserId);

        userdataString = newUser.UserId;
        Debug.Log("userdatastring: " + userdataString);
    });

    Debug.Log("userdatastring out: " + userdataString);
}

当它离开匿名函数时，该值返回null，但在其中，如果它返回我需要获取的id，则知道如何获取字符串值吗？

Answer 1

该firebase函数是一个异步函数，这意味着直到异步函数完成（处于成功或失败状态），内部回调才会运行

这意味着您的调试日志实际上是在运行异步函数的回调之前运行的。

以下是您可以做的几种选择：

让Firebase异步函数在准备就绪时调用回调函数。

public void DoAnonymousSignIn(){
    auth.SignInAnonymouslyAsync().ContinueWith(OnSignInDone);
}

private void OnSignInDone(Task<Firebase.Auth.FirebaseUser> task){
    if (task.IsCanceled){
        Debug.LogError("SignInAnonymouslyAsync was canceled.");
        return;
    }

    if (task.IsFaulted){
        Debug.LogError("SignInAnonymouslyAsync encountered an error: " + task.Exception);
        return;
    }

    Firebase.Auth.FirebaseUser newUser = task.Result;
    Debug.LogFormat("User signed in successfully: {0} ({1})", newUser.DisplayName, newUser.UserId);

    userdataString = newUser.UserId;
    Debug.Log("userdatastring: " + userdataString);
}

通过内联处理回调而不是使用回调函数来保持它的状态，然后设置一个将其标记为就绪的变量或直接从中调用“ SignInDone”函数（例如SignInSuccess（））和SignInFailed（））

您还可以设置自己的回调事件，也可以从其他脚本中订阅它们：

using System;

public static Action OnSignInSuccess;

然后在您的Firebase异步回调中执行以下操作：

    // ... within auth.SignInAnonymouslyAsync() callback

    Firebase.Auth.FirebaseUser newUser = task.Result;
    Debug.LogFormat("User signed in successfully: {0} ({1})", newUser.DisplayName, newUser.UserId);

    userdataString = newUser.UserId;

    if(OnSignInSuccess != null)
        OnSignInSuccess.Invoke();
}

然后其他脚本可以通过以下方式订阅和取消订阅此回调事件：

void OnEnable(){
    YourScript.OnSignInSuccess += SignInSuccess;
}

void OnDisable(){
    YourScript.OnSignInSuccess -= SignInSuccess;
}

private void SignInSuccess(){
    Debug.Log("userdatastring: " + YourScript.staticInstance.userDataString);
}

为什么字符串在Firebase中返回null

1 个答案: