Question

我正在尝试使用两个选项创建UIAlertController＆＃39;取消＆＃39;和＆＃39;退出＆＃39;。我希望＆＃39;取消＆＃39;按钮取消提醒并退出＆＃39;按钮，用于执行与故障板中设置的segue相关联的segue。

我的代码是;

class HomeVC: UIViewController {

@IBAction func SignOutBtn(sender: UIButton) {

    let alertController = UIAlertController(title: "Alert",
        message: "Are you sure you want to log out?",
        preferredStyle: .Alert)

    let cancelAction = UIAlertAction(title:"Cancel",
        style: .Cancel) { (action) -> Void in
            print("You selected the Cancel action.")
    }

    let submitAction = UIAlertAction(title:"Log out",
        style: .Default) { (action) -> Void in
            print("You selected the submit action.")
            self.presentedViewController
    }

    alertController.addAction(submitAction)
    alertController.addAction(cancelAction)


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

}

Answer 1

好吧，您似乎错过了想要在块内执行的操作。（另外，您也可能想要解除块内的警报控制器。）

let cancelAction = UIAlertAction(title: "Cancel", style: .Cancel, handler: { (action) -> Void in
    print("You selected the Cancel action.")
    alertController.dismissViewControllerAnimated(true, completion: nil)
})
let submitAction = UIAlertAction(title: "Log out", style: .Default, handler: { (action) -> Void in
    print("You selected the submit action.")
    alertController.dismissViewControllerAnimated(true, completion: { () -> Void in
        // Perform your custom segue action you need.
    })
})

Answer 2

如果你已经从一个视图设置了一个segue，在你的按钮处理程序中注销，那么你可以调用self.performSegueWithIdentifier("storyboadIdentifier")来调用prepareForSegue方法，这样你就可以修改或传递信息如果需要，segue。

Answer 3

@ pbush25

class HomeVC: UIViewController {

@IBAction func SignOutBtn(sender: UIButton) {

    let alertController = UIAlertController(title: "Alert",
        message: "Are you sure you want to log out?",
        preferredStyle: .Alert)

    let cancelAction = UIAlertAction(title: "Cancel", style: .Cancel, handler: { (action) -> Void in
        print("You selected the Cancel action.")
        alertController.dismissViewControllerAnimated(true, completion: nil)

    })
    let submitAction = UIAlertAction(title: "Log out", style: .Default, handler: { (action) -> Void in
        print("You selected the submit action.")
        alertController.dismissViewControllerAnimated(true, completion: { () -> Void in
            self.performSegueWithIdentifier("segue", sender: nil)
        })
    })

    alertController.addAction(submitAction)
    alertController.addAction(cancelAction)


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


}

UIAlertController - 转换到另一个segue

3 个答案: