Renewing auth token makes dialog appear and disappear

[jameseanthony]

When a user is logged in but the access token is expired, calling -(void)authorize:permissions:delegate: on the Facebook object causes the FBLoginDialog box to animated on and off the screen instantly. If the renewal can be done without user interaction, it would be a much better experience to let that happen in the background instead of obstructing the application.

[yujuan]

If your user usually need very long session. One way is to ask for offline_access permission, the access_token would not expire unless the user explicitly log out.

[jameseanthony]

Once the user logs in once, it would be nice to not make them log in every time they launch the app. offline_access is way overkill, as it gives permission to access account information when the app isn't active.

[yujuan]

For not make them login every time they lauch the app, you can save the access_token in permanent store and use it next time the user launch the app. See theRunAround demo app for example. Actually offline_access means a non expiring token. i.e., even if you do not ask for offline_access, the access_token you have can be used to access user's information as long as it does not expire.

[jameseanthony]

I do save the access_token as in theRunAround. It is still associated with an expiration date, and so the session isn't valid until I call authenticate, with is what triggers the dialog appearing and disappearing.

[yujuan]

When the access token expired, you have to call authorize to get a new access token. Therefore I would suggest use offline_access for now. At the same time, I will see if there is anything else we can do. Hope this helps.