无法在swift中在视图控制器和表视图控制器之间发送int值

the class PreferencesViewController sends nil through prepare for segue regardless if IBActions are taken or not. It seems that something is wrong in my prepare for segue but I'm not sure. I'm not trying to assign to any label or anything I'm just trying to send the int value to another variable in the class Pick2_1. Thanks in adavance import UIKit t