ios6 – iOS SDK似乎无法处理iOS 6中的撤销访问令牌

+ (void) ValidateSession
{    
    FBrequest *userDetails = [[FBrequest alloc] initWithSession:FBSession.activeSession graPHPath:@"/me"];
    [userDetails startWithCompletionHandler:^(FBrequestConnection *connection,NSDictionary *result,NSError *error) {

        if (error) {
            if (FBSession.activeSession.isOpen) {
                // Less probable,so check error code.
            } else {
                // Bingo: here we kNow for sure that the token was uSELEss.
                // Expected behavior: reauthorize.
            }
        } else if (result) {
            NSLog(@"%@",result);
            // token is valid,conTinue
        }

    }];
}

即使在删除应用程序后,iOS似乎仍保留Facebook令牌,因此在需要时再次确保令牌有效是一种很好的做法.