Question

我有一个功能，我检查是否设置了UserDefaults，如果没有，则会打开一个新的View Controller并显示一个登录屏幕，用于设置用户默认值。

我的问题是视图控制器没有实例化但我得到一个打印“用户未注册”

func checkUserAccount() {
        let defaults = UserDefaults.standard
        let accountName = defaults.bool(forKey: "PUserAccountName")
        let accountPassword = defaults.bool(forKey: "PUserAccountPassword")
        if accountName == true && accountPassword == true  {
            print("User Registered")

        } else {

            let storyboard: UIStoryboard = UIStoryboard(name: "PolTRiM", bundle: nil)
            let vc: StudentLoginVC  = storyboard.instantiateViewController(withIdentifier: "studentLogin") as! StudentLoginVC
            vc.modalPresentationStyle = .custom
            vc.modalTransitionStyle = .crossDissolve
            self.present(vc, animated: true, completion: { _ in })
            print("User not registered")
        }

    }

有什么想法吗？

Answer 1

如果正确写入了UIStoryBoard名称和UIViewController标识符，您是否仔细检查过？否则此代码对我有用

let storyboard = UIStoryboard(name: "Main", bundle: nil)
let viewController = storyboard.instantiateViewController(withIdentifier :"MyViewController") as! UIViewController
self.present(viewController, animated: true)

无法实例化视图控制器

1 个答案: