ios - 单击警报按钮不起作用时更改 View

Question

你好，

这是我的代码:

@IBAction func logOutAction(sender: AnyObject) {

        try! FIRAuth.auth()!.signOut()
    let alertController = UIAlertController(title: "Sure?", message: "Are you sure you want to log out?", preferredStyle: .Alert)

    let defaultAction = UIAlertAction(title: "Yes", style: .Default, handler: nil)
    alertController.addAction(defaultAction)

    let defaultAction2 = UIAlertAction(title: "No", style: .Cancel, handler: nil)
    alertController.addAction(defaultAction2)

    self.presentViewController(alertController, animated: true, completion: nil)

    let VC = self.storyboard?.instantiateViewControllerWithIdentifier("loginscreen") as! ViewController //The file that controls the view

    self.presentViewController(VC, animated: true, completion: nil)


}

如您所见，我想在按下注销按钮时注销用户。当用户单击注销时，UIalert 弹出窗口询问他们是否确定要注销，但是当我单击“确定”时，它不会切换回登录界面 ViewController。

谁能帮帮我？

Answer 1

如果最后两行表示您要呈现的 View ，那么您必须在"is"按钮操作的处理程序中执行此代码:

let defaultAction = UIAlertAction(title: "Yes", style: .Default, handler: { _ in
    let VC = self.storyboard?.instantiateViewControllerWithIdentifier("loginscreen") as! ViewController //The file that controls the view

    self.presentViewController(VC, animated: true, completion: nil)
})

alertController.addAction(defaultAction)