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

发布时间：2020-12-14 18:04:59 所属栏目：百科来源：网络整理

导读：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

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)
 }

（编辑：李大同）

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