ios - instantiateViewControllerWithIdentifier returning nil -

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i have authorization window. when app starting okey. tap sign in , go next window. when tap sign out , want @ authorization window - nil. in method signinview controller nil.

enter image description here

you need take instance storyboard. 

 let storyboard = uistoryboard(name: "main", bundle: nil)  let controller = storyboard.instantiateviewcontrollerwithidentifier(“myviewcontroller”)

in way controller instance.

make sure set storyboard id controller.

enter image description here


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