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FB SDK updated to the version 17.0.0. In this version FB made changes in login flow, read about it in Changes made to Facebook Login SDK for iOS
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New functions for limited login were added:
facebook.login_with_tracking_preference()- iOS ONLY. Login to Facebook and request a set of permissions. Allows developers to signal that a login is limited in terms of tracking users.facebook.get_current_authentication_token()- iOS ONLY. This function returns the currently stored authentication token after a previous successful login.facebook.get_current_profile()- iOS ONLY. After your application receives the logged-in user’s authentication token, you can use this function to read information that user has granted to your application.facebook.set_default_audience()- iOS ONLY. The audience that should be able to see the publications. Should be called beforefacebook.login_with_tracking_preference().facebook.LOGIN_TRACKING_ENABLED- available only if in App Tracking Transparency request user enabled tracking.facebook.LOGIN_TRACKING_LIMITED- should beused if in App Tracking Transparency request user disabled tracking.
If the user has disabled tracking, but you still attempt to log in using facebook.login_with_permissions() or its equivalent facebook.login_with_tracking_preference() with facebook.LOGIN_TRACKING_ENABLED, you will receive a Facebook Access token, but will not be valid.
More information about the changes is available in the official Facebook documentation: