Facebook ios sdk (obj-c to swift) issue -

i trying bring obj-c code swift (facebook ios sdk), autocomplete(intellisense) not work in handler , error (marked in code) : set nsobject not have member named 'containsobject'

@ibaction func loginwithfacebook(sender: anyobject) {         /*         fbsdkloginmanager *login = [[fbsdkloginmanager alloc] init];         [login loginwithreadpermissions:@[@"email"] handler:^(fbsdkloginmanagerloginresult *result, nserror *error) {         if (error) {         // process error         } else if (result.iscancelled) {         // handle cancellations         } else {         // if ask multiple permissions @ once,         // should check if specific permissions missing         if ([result.grantedpermissions containsobject:@"email"]) {         // work         }         }         }];         */           let fbloginmanager = fbsdkloginmanager()         fbloginmanager.loginwithreadpermissions(["email"], handler: {             result, error in             if ((error) != nil){              }             else if (result.iscancelled){              } else {                 if(result.grantedpermissions.containsobject("email")){  //<-- error here                  }             }          })        } 

because swift 1.2 automatically casts nsset objects (the ones coming external libs/sdks/frameworks etc...) set structure need call contains instead of containsobject such things (doc).