ios - 通过快速警报更改屏幕

Question

我不知道如何以编程方式更改屏幕。我有一个警报 View ，我希望能够在用户按下“确定”按钮时更改屏幕。我该怎么做？

这是我的新代码:

func showAlertController(){
    let tilte = "My Medication"
    let message = NSLocalizedString("Go through Medication guide?", comment: "")
    let cancelButtonTitle = NSLocalizedString("Dismiss", comment: "")
    let otherButtonTitle = NSLocalizedString("Ok", comment: "")

    let alertController = UIAlertController(title: title, message: message, preferredStyle: .Alert)



    let cancelAction = UIAlertAction(title: cancelButtonTitle, style: .Cancel){ action in
        NSLog("User said no")}

    let otherAction = UIAlertAction(title: otherButtonTitle, style: .Default){action in
        // I know I need to put something in here.
        let appointment = Appointment()
        self.presentViewController(appointment, animated:true, completion:nil)
    }

    alertController.addAction(cancelAction)
    alertController.addAction(otherAction)

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

}

但是现在我得到一个错误说:线程 1:EXC_BAD_INSTRUCTION(code=EXC_l1386_INVOP,subcode=0x0)

Answer 1

在 UIAlertAction 闭包中为“Ok”按钮添加 presentViewController，这意味着按钮已按下，因此您可以为 block 内按下的按钮做一些事情。

class MainViewController: UIViewController {
     ...
     ...
     func showAlertController(){
        let tilte = "My Medication"
        let message = NSLocalizedString("Go through Medication guide?", comment: "")
        let cancelButtonTitle = NSLocalizedString("Dismiss", comment: "")
        let otherButtonTitle = NSLocalizedString("Ok", comment: "")

        let alertController = UIAlertController(title: title, message: message, preferredStyle: .Alert)



        let cancelAction = UIAlertAction(title: cancelButtonTitle, style: .Cancel){ action in
            NSLog("User said no")}

        let otherAction = UIAlertAction(title: otherButtonTitle, style: .Default){action in
            // I know I need to put something in here.
            let appointmentViewController = AppointmentViewController()
            self.presentViewController(appointmentViewController, animated:true, completion:nil)    
        }

        alertController.addAction(cancelAction)
        alertController.addAction(otherAction)

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

    }
    ...
    ...
}

class AppointmentViewController: UIViewController {

}