Xcode can't change View Controller

Question

let profileViewController = 
self.storyboard?.instantiateViewController(withIdentifier: 
"ProfileViewcontroller") as! ProfileViewController

self.navigationController?.pushViewController(profileViewController, 
animated: true)

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Don't understand, why it isset working.

Answer 1

Can you try initializing storyboard ?

Either storyboard or navigationController is nil.

 let storyboard = UIStoryboard(name: "Main", Bundle: Bundle.main) 
 let profileViewController = storyboard.instantiateViewController(withIdentifier: "ProfileViewcontroller") as! ProfileViewController
 self.navigationController?.pushViewController(profileViewController, animated: true)