如何从 Facebook 注销并切换用户？

Question

我使用我的应用程序上的用户登录了 facebook。

稍后当我在我的 Facebook 应用和浏览器上手动注销此用户时，

(FB.IsLoggedIn) 仍然返回 true。 由于某种原因，旧的个人资料已保存，我无法使用新用户登录

这是我的代码：

public void FacebookLogin()
{
    if (FB.IsLoggedIn)
        FB.LogOut();  //it doesn't work, user is still logged in


     var permissions = new List<string>() {"email"};
      FB.LogInWithReadPermissions(permissions);  //trying to login a new user, but the last user is still logged in

Answer 1

将您的 FacebookLogin 函数更改为协程函数。通过这样做，您可以检查用户是否已登录，注销用户然后等待每一帧直到FB.IsLoggedIn 为false，然后您才能登录另一个用户。还要在等待中添加一个计时器，这样当FB.IsLoggedIn 在x 时间内永远不会是false 时，该函数将不会继续运行但会显示一些错误并退出。

public IEnumerator FacebookLogin()
{
    //5 seconds loggout time
    float waitTimeOut = 5f;

    //Log out if loggedin
    if (FB.IsLoggedIn)
        FB.LogOut();  //it doesn't work, user is still logged in

    //Wait until logout is done. Also add a timeout to the wait so that it doesnt wait forever
    float timer = 0;
    while (FB.IsLoggedIn)
    {
        if (timer > waitTimeOut)
        {
            Debug.LogError("Failed to log out within " + waitTimeOut + " seconds");
            yield break;
        }
        timer += Time.deltaTime;
        yield return null;
    }
    Debug.Log("Successfully logged out. Now logging another user in");
    var permissions = new List<string>() { "email" };
    FB.LogInWithReadPermissions(permissions);  //trying
}

如果您对此仍有疑问，您需要在facebook-sdk-for-unity Github 页面上提交错误报告，并附上此答案中的代码。

Answer 2

注销后您正在登录。

public void FacebookLogin()
    {
            if (FB.IsLoggedIn)
             {   
              FB.LogOut();  //it doesn't work, user is still logged in
              return;
             }
              var permissions = new List<string>() {"email"};
              FB.LogInWithReadPermissions(permissions);  //t
    }