Xcode 无法更改视图控制器

Question

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

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

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不明白，为什么它设置工作。

Answer 1

你能试试初始化故事板吗？

故事板或导航控制器为零。

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

Xcode 无法更改视图控制器

Xcode can't change View Controller

xcode

pushviewcontroller