ios – Swift 3Xcode 8.2 – viewDidLoad中的切换视图不起作用

概述我想在用户登录时切换加载ViewController. 问题：当用户等于“true”时,视图没有改变… 先感谢您！！ override func viewDidLoad() { super.viewDidLoad() var user: String? user = UserDefaults.standard.value(forKey: "loginSuccessfull 我想在用户登录时切换加载VIEwController.
问题：当用户等于“true”时,视图没有改变…

先感谢您！！

overrIDe func vIEwDIDLoad() {    super.vIEwDIDLoad()    var user: String?    user = UserDefaults.standard.value(forKey: "loginSuccessfull") as? String    if user == "true" {        let vc = self.storyboard?.instantiateVIEwController(withIDentifIEr: "SecondVIEw") as UIVIEwController!        self.show(vc!,sender: vc)    }    // Do any additional setup after loading the vIEw,typically from a nib.}

解决方法 从vIEwDIDLoad方法中删除代码并使用以下方法.

overrIDe func vIEwDIDAppear() {     guard let user = UserDefaults.standard.string(forKey: "loginSuccessfull"),user == "true" else {      return     }     let vc = self.storyboard?.instantiateVIEwController(withIDentifIEr: "SecondVIEw")!     self.present(vc,animated: true) }

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