facebook login give me already authorized this app without automatic returning to the app

Question

My app should implement login with facebook but I have noticed that every time I want to login the facebook tell me you are already authorize this app , the question if I already authorized the app the facebook should return automatically without pressing the okey button as I saw in other applications ?

see the attached image

Answer 1

I fixed my problem by doing the following steps :
1- login to your facebook as admin to your app.
2- go to https://developers.facebook.com/apps/YOUR_FACEBOOK_APP_ID/summary.
3- go to settings > basic > Native IOS app
4- set the Configured for iOS SSO: to enabled

Answer 2

In iOS/Android the FBAccessToken's expiration time is up to 60 days. When you do FBLogin in your app you get the access token. once you get the token you should not do login again(otherwise you will be prompted already authorized this app since your app has already been given an access token earlier which is not expired ). You should reuse the unexpired access token.

Like this :

if FBSDKAccessToken.currentAccessToken() != nil {
  print(FBSDKAccessToken.currentAccessToken().userID)
  print(currentAccessToken().tokenString)
//OR call the *FBGraphRequest*
 }

Note: for in-App browser login (SVC: Safari View Controller)

see more: https://developers.facebook.com/blog/post/2015/10/29/Facebook-Login-iOS9/ and https://developers.facebook.com/docs/reference/ios/4.9/class/FBSDKLoginManager/