Question

以下是我的应用的故事板： enter image description here

应用程序与screen1上的服务器建立连接，并且仅与此屏幕的代码执行与服务器的所有通信。我们在screen4上发出请求，并通过screen1的代码将其发送到服务器，app接收来自服务器的响应。如果应用程序获得成功响应，则应用程序应显示screen5，我收到错误。我写了不同的代码行但是失败了。以下是我现在使用的代码行：

import UIKit

class logoViewController: UIViewController {

    @IBOutlet weak var act: UIActivityIndicatorView!
    override func viewDidLoad() {
        super.viewDidLoad()

        self.act.startAnimating()



        // Do any additional setup after loading the view.
    }


    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    // syncreq function is called from the connectionViewController.
    // connectionViewController is the common class for connecting to the remote server  
    func syncreq (JSONdata: AnyObject) { // Proceesing for PRMS response


       // Getting the value from the JSON
        var Successful = self.getIntFromJSON(JSONdata as NSDictionary, key: "Successful")


        println("Value of Successful : \(Successful)")

        if (Successful == 0){

            //Method1 not worked
  // let adduser = regVC()
  // self.presentViewController(adducer, animated: true, completion: nil)
   //Method2 not worked
 //let adducer =    self.storyboard?.instantiateViewControllerWithIdentifier("registrationID") as regVC

        //self.navigationController?.pushViewController(adducer, animated: true)

           //Method3 not worked
            //let secondViewController = self.storyboard?.instantiateViewControllerWithIdentifier("registrationID") as regVC

            //self.navigationController?.pushViewController(secondViewController, animated: true)
            //performSegueWithIdentifier("registrationID", sender: self)


            let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
            var setViewController = mainStoryboard.instantiateViewControllerWithIdentifier("registrationID") as RegisterViewController
            self.presentViewController(setViewController, animated: false, completion: nil)

        }
        else if (Successful == 1){
             let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
            var setViewController = mainStoryboard.instantiateViewControllerWithIdentifier("mnuID") as menuViewController
            self.presentViewController(setViewController, animated: false, completion: nil)
        }



    }

    func getIntFromJSON(data: NSDictionary, key: String) -> Int {

        let info : AnyObject? = data[key]
        // println("Value of data[key] : \(key)")

        if let info = data[key] as? Int {
            println("Value of value for \(key) : \(info)")
            return info
        }

        else {
            return 0

        }

    }

}

我收到以下错误：

Warning: Attempt to present <project.screen5: 0x7a094790> on <project.ViewController: 0x79639d90> whose view is not in the window hierarchy!

错误的屏幕截图： enter image description here

Answer 1

您的问题是ViewController 1的视图不在窗口层次结构中，因此ViewController 1无法呈现模态VC。

最干净的修复方法是更改您的应用程序架构设计 - 让一个视图控制器执行所有网络请求可能会导致更多复杂问题。

然而，为了让它发挥作用＆＃39;解决方案，您可以从导航控制器提供模态VC，即

self.navigationController?.presentViewController(setViewController, animated: false, completion: nil)

快速更改屏幕

1 个答案: