Facebook iOS SDK v3.1：当其他用户登录Facebook时，如何注销应用程序中的上一个用户？

Question

If the user logs out from the Facebook app, my app won't be affected. Then if he logs in with a different account through Facebook app, my app can't detect it.

How can I detect if a different user/account is using my app?

Answer 1

You can get the facebook user's id (and more) using the graph api:

[[FBRequest requestForMe] startWithCompletionHandler:^(FBRequestConnection *connection,NSDictionary<FBGraphUser> *user, NSError *error) {
    if (!error) {
        NSLog(@"%@",user.id);
    }
}];

You can use that to detect which user is using your app.