Question

美好的一天，

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)


}

正如您所看到的，我想在按下注销按钮时注销用户。当用户点击注销UIalert弹出窗口询问他们是否确定要注销时，但是当我单击okay时它不会切换回loginscree ViewController。

任何人都可以帮助我吗？

Answer 1

如果最后两行代表您要呈现的视图，那么您必须在＆＃34;是＆＃34;的处理程序中执行此代码。按钮动作：

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)

Answer 2

您需要在有人点击“是”

后退出

    let yesActionHandler = { (action:UIAlertAction!) -> Void in
        let VC = self.storyboard?.instantiateViewControllerWithIdentifier("loginscreen") as! ViewController //The file that controls the view
        self.presentViewController(VC, animated: true, completion: nil)
    }
    let defaultAction = UIAlertAction(title: "Yes", style: .Default, handler: yesActionHandler)
    alertController.addAction(defaultAction)

单击警报按钮不起作用时更改视图

2 个答案: