Ios 如何通过AlertView切换到另一个具有perform segue的ViewController？

当警报视图出现时，如何更改为另一个视图控制器？理想情况下，当我按下“确定”按钮时，我希望它以编程方式更改为另一个视图控制器

我需要实现以下功能：

    func shouldPerformSegueWithIdentifier(_ identifier: String,
                                   sender sender: AnyObject?) -> Bool

这是我的可达性类：

import Foundation
import SystemConfiguration

public class ReachabilityNotification {

    class func isConnectedToNetwork() -> Bool {

        var zeroAddress = sockaddr_in(sin_len: 0, sin_family: 0, sin_port: 0, sin_addr: in_addr(s_addr: 0), sin_zero: (0, 0, 0, 0, 0, 0, 0, 0))
        zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
        zeroAddress.sin_family = sa_family_t(AF_INET)

        let defaultRouteReachability = withUnsafePointer(&zeroAddress) {
            SCNetworkReachabilityCreateWithAddress(kCFAllocatorDefault, UnsafePointer($0))
        }

        var flags: SCNetworkReachabilityFlags = SCNetworkReachabilityFlags(rawValue: 0)
        if SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) == false {
            return false
        }

        let isReachable = flags == .Reachable
        let needsConnection = flags == .ConnectionRequired

        return isReachable && !needsConnection

    }
}

这是我的ViewController：

import UIKit
import Foundation

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        if Reachability.isConnectedToNetwork() == true {
            print("Internet connection OK")
        } else {
            print("Internet connection FAILED")
            let alert = UIAlertView(title: "No Internet Connection", message: "Make sure your device is connected to the internet.", delegate: nil, cancelButtonTitle: "OK")
            alert.show()

        }

    }
}

---

只需调用

performsguewithidentifier（identifier:String，sender:AnyObject？）

函数，即可切换到新的视图控制器。确保使用与序列图像板中的序列相同的字符串

标识符

尝试以下方法：

if ReachabilityNotification.isConnectedToNetwork() == true {
    print("Internet connection OK")
} else {
    print("Internet connection FAILED")

    var connectionAlert = UIAlertController(title: "No Internet Connection", message: "Make sure your device is connected to the internet.", preferredStyle: UIAlertControllerStyle.Alert)

    connectionAlert.addAction(UIAlertAction(title: "Ok", style: .Default, handler: { (action: UIAlertAction!) in
      performSegueWithIdentifier("SegueIdentifier", sender: self)
      }))

    presentViewController(connectionAlert, animated: true, completion: nil)
}

编辑：

在过程中使用
viewDidLoad（）
太早，无法显示
UIAlertController
。尝试将警报移动到
viewdilaper

import UIKit
import Foundation

class ViewController: UIViewController {

    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)

        if Reachability.isConnectedToNetwork() == true {
            print("Internet connection OK")
        } else {
            print("Internet connection FAILED")

            let connectionAlert = UIAlertController(title: "No Internet Connection", message: "Make sure your device is connected to the internet.", preferredStyle: UIAlertControllerStyle.Alert)

            connectionAlert.addAction(UIAlertAction(title: "Ok", style: .Default, handler: { [unowned self] (action: UIAlertAction!) in
                self.performSegueWithIdentifier("NoConnection", sender: self)
            }))

            presentViewController(connectionAlert, animated: true, completion: nil)
        }
    }
}

只需调用
performsguewithidentifier（identifier:String，sender:AnyObject？）
函数，即可切换到新的视图控制器。确保使用与序列图像板中的序列相同的字符串
标识符

尝试以下方法：

if ReachabilityNotification.isConnectedToNetwork() == true {
    print("Internet connection OK")
} else {
    print("Internet connection FAILED")

    var connectionAlert = UIAlertController(title: "No Internet Connection", message: "Make sure your device is connected to the internet.", preferredStyle: UIAlertControllerStyle.Alert)

    connectionAlert.addAction(UIAlertAction(title: "Ok", style: .Default, handler: { (action: UIAlertAction!) in
      performSegueWithIdentifier("SegueIdentifier", sender: self)
      }))

    presentViewController(connectionAlert, animated: true, completion: nil)
}

编辑：

在过程中使用
viewDidLoad（）
太早，无法显示
UIAlertController
。尝试将警报移动到
viewdilaper

import UIKit
import Foundation

class ViewController: UIViewController {

    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)

        if Reachability.isConnectedToNetwork() == true {
            print("Internet connection OK")
        } else {
            print("Internet connection FAILED")

            let connectionAlert = UIAlertController(title: "No Internet Connection", message: "Make sure your device is connected to the internet.", preferredStyle: UIAlertControllerStyle.Alert)

            connectionAlert.addAction(UIAlertAction(title: "Ok", style: .Default, handler: { [unowned self] (action: UIAlertAction!) in
                self.performSegueWithIdentifier("NoConnection", sender: self)
            }))

            presentViewController(connectionAlert, animated: true, completion: nil)
        }
    }
}

警报控制器现在不再在其未连接internet时显示，而在它出现之前则不再显示。我以前的代码是用“AlertView”设置的。您能用您试图显示警报的整个类更新您的原始问题吗？此外，UIAlertView在iOS8中被弃用。如果您可以放弃对iOS7的支持，最好转到UIAlertController。我使用了您提供的代码，但是当他们没有internet连接时，AlertController不会出现，而以前我使用AlertView时，AlertController出现了。这是项目下载链接，我已经正确地实现了所有功能，但仍然不走运。警报控制器现在不再在其未连接internet时显示，而在它出现之前则不再显示。我以前的代码是用“AlertView”设置的。您能用您试图显示警报的整个类更新您的原始问题吗？此外，UIAlertView在iOS8中被弃用。如果您可以放弃对iOS7的支持，最好转到UIAlertController。我使用了您提供的代码，但是当他们没有internet连接时，AlertController不会出现，而以前我使用AlertView时，AlertController出现了。这是项目下载链接，我已经正确地实现了所有功能，但仍然不走运。