如何更改View在UIAlertViewController中单击按钮

Question

UIAlertViewController显示我的所有文字，但点击后不会切换到另一个视图。这是代码：

    let alertController = UIAlertController(title: "Risposta Esatta", message:"",       preferredStyle: UIAlertControllerStyle.Alert)


    alertController.addAction(UIAlertAction(title: "Avanti", style:UIAlertActionStyle.Default,handler: {(UIAlertAction) in
        let secondViewController:SecondViewController = SecondViewController()
        self.presentViewController(secondViewController, animated: true, completion: nil)
    }))

Answer 1

这对我有用：

@IBAction func choiceBtn(sender: UIButton) {
        let alertController = UIAlertController(title: "Hello!", message: "This is Alert sample.", preferredStyle: .Alert)
        let otherAction = UIAlertAction(title: "OK", style: .Default) {
            action in println("pushed OK!")
        }
        let cancelAction = UIAlertAction(title: "CANCEL", style: .Cancel) {
            action in self.performSegueWithIdentifier("VC2", sender: self)
        }

        alertController.addAction(otherAction)
        alertController.addAction(cancelAction)
        presentViewController(alertController, animated: true, completion: nil)
    }

我创建了一个模式，从VC1到VC2呈现了segue，并且还命名了标识符VC2。这段代码我改编自GitHub UIAlertController示例：

https://github.com/eversense/Swift-UIAlertController-Example

没有segue到另一个ViewController，所以我添加了它来向你展示。