在IOS上检查Facebook Connect会话 [英] Check Facebook Connect Session on IOS

问题描述

使用新的Facebook库，FBSession对象消失了。
如何检查用户在他的设备上是否有一个有效的会话，当他启动应用程序时没有提示safari或uiwebview？

With the new Facebook library, FBSession object is disappeared. How can i check if user has a valid session on his device immediately when he start the app without prompt to safari or uiwebview ?

[facebook isSessionValid]方法适用于acccessToken，但accessToken在应用程序从safari（或inline uiwebview）返回时设置。

The [facebook isSessionValid] method works on acccessToken but accessToken is set when app come back from safari (or inline uiwebview).

是否可以使用Cookie检查会话？

Is it possibleto check session using cookies ?

推荐答案

成功登录后，您要保存访问令牌和到期日期，如下所示：

After a successful login, you want to save the access token and expiration date, like this:

[[NSUserDefaults standardUserDefaults] setObject:_facebook.accessToken forKey:@"AccessToken"];
[[NSUserDefaults standardUserDefaults] setObject:_facebook.expirationDate forKey:@"ExpirationDate"];
[[NSUserDefaults standardUserDefaults] synchronize];

然后，当您加载应用程序时，您想要检查是否有一个保存的令牌， ：

Then, when you load the app, you want to check if there is a saved token, like this:

_facebook = [[Facebook alloc] initWithAppId:@"[app_id]"];
_facebook.accessToken    = [[NSUserDefaults standardUserDefaults] stringForKey:@"AccessToken"];
_facebook.expirationDate = (NSDate *) [[NSUserDefaults standardUserDefaults] objectForKey:@"ExpirationDate"];
if (![_facebook isSessionValid]) {
    [_facebook authorize:_permissions delegate:self];
}
else {
    [_facebook requestWithGraphPath:@"me" andDelegate:self];
}

希望这有助！

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