facebook-ios-sdk注销问题 [英] facebook-ios-sdk logout question

问题描述

我在Facebook Graph API中看到很多问题，但是我仍然没有找到使用它的简单登录/注销操作的解决方案。看起来像单点登录风格会导致更多的困惑而不是好处。

I have seen a lot of questions here regarding the Facebook Graph API but I still haven't find a solution for simple 'login'/'logout' operations using it. Looks like the Single Sign-On style is causing more confusion than benefits.

我想知道是否可能有以下情况：

I'd like to know if it is possible have the following situation:

1. 输入应用程序（无 accessToken / expirationDate 创建）。


2. 通过调用 authorize：delegate：方法（应用程序进入后台登录，进行登录）在全球范围（Facebook App / Mobile Safari）中，请求用户凭据。


3. 回到应用程序（现在登录， accessToken 和 expirationDate 保存到 NSUserDefaults ）。


4. 通过调用 logout：方法（现在退出， accessToken 和从 NSUserDefaults 中删除​​expirationDate ）


5. 尝试再次执行登录，相同的步骤在2中完成。

1. Enter in the app (no accessToken/expirationDate created).
2. Perform a login using SSO by calling authorize:delegate: method (application goes background and the login is made in the 'global' scope (Facebook App/Mobile Safari), asking for the user credentials.
3. Enter back in the app (now logged in, both accessToken and expirationDate are saved to NSUserDefaults).
4. Perform a logout by calling the logout: method (now logged out, both accessToken and expirationDate are removed from NSUserDefaults)
5. Attempt to perform a login again, with exactly the same steps done in 2.

确定当我调用注销：，我从我的应用程序范围真的从Facebook注销（ accessToken 无效） ，而不是从全局范围（Facebook App / Mobile Safari）。在 5。）中，当我再次登录时，应用程序进入后台，登录尝试在Facebook App / Mobile Safari中像往常一样重新进行，但是我正在屏幕上显示我'已经登录了：

I realize that when I call logout:, I do really log out from Facebook (accessToken is invalidated) from my App scope, not from the global scope (Facebook App/Mobile Safari). In 5.) when I try to log in again, the application goes to background and the login attempt is made again in Facebook App/Mobile Safari as usual, however I'm getting a screen saying that I'm already logged in:

您已经授权 ... 。按确定继续。
以 ... （不是您）登录

You have already authorized .... Press "Okay" to continue. Logged in as ... (Not You?).

<对于刚刚在我的应用程序中注销的用户来说，这是一个奇怪的行为。
我的问题是：

It's a strange behavior for the user that has just logged out in my App. My question is:

我可以从我的应用程序里面从Facebook（我的意思是全球范围）退出真的 ？这会影响使用Facebook凭据的其他应用程序，但是如果我不能这样做，我该如何避免上述奇怪的行为？

"Can I really log out from facebook (I mean 'global' scope) from inside my App? This would affect other apps using the facebook credentials too. However, if I can't to do this, how can I avoid the 'strange behavior' describe above?

谢谢

推荐答案

恐怕答案是否定的，你不能这样做。

I'm afraid the answer is no, you can't do this.

您的应用程序位于沙箱中，无法在外面写入全局Cookie（适用于移动Safari）和Facebook应用设置（在Facebook应用程序偏好/我认为的cookies中）

Your application is in a sandbox, and can't write outside, where global cookies are (for mobile safari) and Facebook app settings (in Facebook app preferences/cookies I think)

您只能警告您的用户注销您的应用程序...

You can only warn your user to logout outside of your app...

...或者您也可以不使用facebook api SSO，但在应用程序登录webform，像我做的其他原因。

...Or you can just not use facebook api SSO, but in app login webform, like I do for other reasons.

如果您选择该选项此拉请求可能会节省一些时间;）

If you choose that option this pull request might save you some time ;)

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