ios - Get viewController reference to shared code behind file -

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i've started developing apps ios , have problem can't figure out atm.

my app contain 2 viewcontrollers, both of them have 1 label each , want code behind (one single file) same calculation 2 different numbers depending on viewcontroller shown.

for example: code behind should calculate 1 * x, x either 1 first view or 2 second view. (and print sum)

so, there anyway can reference of view i'm (the user) at? or have create 2 files code behind same code, 1 number different?

storyboard: enter image description here

what want achieve in pseudo:

if viewcontroller == 1     label1.text = 1 else if viewcontroller == 2     label2.text = 2

thanks help

imo best option have 1 view controller (in storyboard too) , 2 views outlets , swap them (hide/show).

but can distinguish between views example tag property of uiview.

tag property in storyboard


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