ios - Apple rejected app 10.6 because Facebook opens Safari to login

Question

I sent another version of my app, that allow users to login via Facebook. Of course, I use official Facebook iOS SDK.

But Apple twice rejected my app with following reason:

The app opens a web page in mobile Safari for logging in, then returns the user to the app. The user should be able log in without opening Safari first.

I tried to get more info, and reviewer's answer was:

Thank you for your response. We reviewed your app version 3.2.1 and when the user taps Facebook to login, the user is taken to mobile Safari and then back to the app.

It provides poor user's experience and not in compliance with the Guidelines.

and

Thank you for your response. It would be appropriate to allow the users to login inside the app without redirecting to mobile Safari.

Why only my app got this error, when dozens of apps using Facebook iOS SDK this way and don't get rejects?

Is there way in Facebook iOS SDK to open login page inside app?

Answer 1

Facebook SDK 4.0+

FBSDKLoginManager *login = [FBSDKLoginManager new];
if (![UIApplication.sharedApplication canOpenURL:[NSURL URLWithString:@"fb://"]])
{
  login.loginBehavior = FBSDKLoginBehaviorWeb;
}

It will prevent to open through Safari.