iphone - re request Facebook permissions with Facebook sdk 3.x in iOS -

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i using facebook sdk 3.14 , requesting user forpublic profile, email, user_photos permissions. using email login purpose. if user denies email during login , there no way ask back. have seen apps airbnb , zomato returning user permissions page unless reuired permissions given user.

is there way in can re-request user permissions not granted during login process.

i using below code requesting permissions

        [fbsession openactivesessionwithreadpermissions:@[@"public_profile",@"email",@"user_friends",@"user_photos"]                                        allowloginui:yes                                   completionhandler:      ^(fbsession *session, fbsessionstate state, nserror *error) {           // retrieve app delegate            if(error.code ==2 && [errorreason isequaltostring:@"com.facebook.sdk:userlogincancelled"]){              [facebookwebobj performselector:@selector(hideanimatedloader) withobject:nil afterdelay:0.5];          }          else          {          // email id , login user          }       }];


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