Swift Facebook Login no url after logout -


i've implemented in app: https://developers.facebook.com/docs/swift/login/ i've pretty followed tee, except have 2 view controllers implementation; 1 outside of navigation controller login (1), 1 inside of navigation controller logout (2).

i can login fine, after logout, going view controller (1), after clicking "continue facebook", shows me blank safari page.

when logging in first time, url bar show "facebook.com" enter image description here

but after logout , when want re-login again, url blank enter image description here

may know need do? thanks.

vc code here: https://codedump.io/share/j1rxrjvmbw00/1

edit: login open navigation controller (indirectly), , logout dismiss it. seems cause of problem i'm not sure how.


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