Swift 3/Xcode 8.2 - 在 vi​​ewDidLoad 中切换视图不起作用 [英] Swift 3 / Xcode 8.2 - switch view in viewDidLoad not working

问题描述

当用户已经登录时，我想在加载时切换 ViewController.问题:当用户等于true"时，视图没有改变......

I want to switch the ViewController on load when the user is already logged in. The problem: The view didnt change when user is equal to "true"...

提前谢谢你！！

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.
}

推荐答案

从 viewDidLoad 方法中删除代码并使用下面的方法.

Remove the code from viewDidLoad method and use the below method.

 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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