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我正在设置我的应用程序，以便用户可以使用 Facebook 登录。我已经加载了 Facebook SDK，但由于某种原因，当我尝试“登录”到 Facebook 时，我在控制台中收到此错误：

FBSDKLog: Error Domain=com.facebook.sdk Code=5 "操作无法完成。(com.facebook.sdk 错误 5.)" UserInfo=0x10906da90 {com.facebook.sdk:HTTPStatusCode=400, com.facebook .sdk:ErrorSessionKey=，过期日期：2014-01-02 03:26:48 +0000，刷新日期：2013-11-03 06:19:26 +0000，尝试刷新日期：0001-12-30 00:00:00 +0000 , 权限。

有谁知道为什么？看看下面的代码。我觉得这与我的 ShowLoginView 方法有关（我试图在现有 Storyboard 之上打开 SSLloginViewcontroller Xib）。在我开始使用这种方法之前，我能够很好地登录 Facebook……帮助 :)

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
 self.mainViewController = [[SSViewController alloc]
                           initWithNibName:@"SSViewController" bundle:nil];
self.navController = [[UINavigationController alloc]
                      initWithRootViewController:self.mainViewController];
self.window.rootViewController = self.navController;
[self.window makeKeyAndVisible];


    if (FBSession.activeSession.state == FBSessionStateCreatedTokenLoaded) {
        // Yes, so just open the session (this won't display any UX).
        [self openSession];
    } else {
        // No, display the login page.
        [self showLoginView];

    }
        return YES;

}

- (void)showLoginView
{


    UIViewController *topViewController = [self.navController topViewController];
    UIViewController *modalViewController = [topViewController modalViewController];

    // If the login screen is not already displayed, display it. If the login screen is
    // displayed, then getting back here means the login in progress did not successfully
    // complete. In that case, notify the login view so it can update its UI appropriately.
    if (![modalViewController isKindOfClass:[SSLoginViewController class]]) {
        SSLoginViewController* loginViewController = [[SSLoginViewController alloc]
                                                      initWithNibName:@"SSLoginViewController"
                                                      bundle:nil];
        [topViewController presentViewController:loginViewController animated:NO completion:nil];
    } else {
        SSLoginViewController* loginViewController =
        (SSLoginViewController*)modalViewController;
        [loginViewController loginFailed];
    }
}
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