iOS Facebook Login Fast-App Switch Stays on Facebook App

Question

I'll preface this by saying that this bug is difficult to reproduce and I have not been able to find a pattern for when it occurs.

When a user selects the Facebook login option in my iOS app, the app fast-switches to the Facebook app, and will stay in the Facebook app on the News Feed. Then when a user returns to my iOS app, and attempt to Facebook login again, it will fast-app switch and the login will continue as intended. When this bug occurs, it always fails, and then works reliably on the following attempt.

Answer 1

Make sure you have "fbXXXXXXXXXX:" in your plist

XXXXXX = you app id

When the app switches back it needs to know where to go, your app needs to respond to the url correctly.