Facebook iOS SDK：无需显示对话框即可刷新过期的访问令牌

Question

I'm using the Facebook iOS SDK . In my code I have authorized my app with the default permissions, so my session is valid until the expiration date is reached. However, after the expiration date is reached, I attempt to reauthorize in order to "refresh my OAuth token", as asked before .

However, when I attempt to reauthorize, it displays a dialog saying I have already authorized my app, even though I expect it to just update my OAuth token without a dialog. According to facebook, this is possible :

When you redirect the user to the auth dialog, the user is not prompted for permissions if the user has already authorized your application. Facebook will return you a valid access token without any user facing dialog .

However, I do get a dialog and I'd like to know how I can refresh the access token without getting the dialog.

Answer 1

A recent commit in the Facebook iOS SDK project included an "extend access token" method for extending an expired token.

More information about this and the deprecation of "offline_access" is in Facebook Developer's blog post .

Answer 2

A possible work around is to request offline_access as a permission. Then the access token only expires when:

The user logs out of facebook Changes their password Revokes permissions for your app via the facebook website

If anyone has a better answer id like to know too. Requesting offline access for my app could look a bit suspicious (even though the only reason I need it is for non-expiring access token, I wont actually be accessing a users account when their not using my app).