这是什么意思？ “'NSUnknownKeyException'，原因：...这个类不是密钥X的编码兼容密钥值”？

Question

我recieving一个SIGABRT错误：

*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key changeToNewView.'

这些都是我的视图控制器：

import UIKit 

class PhotoShareViewController: UIViewController { 

    @IBOutlet weak var imageView: UIImageView! 
    @IBOutlet weak var contentTextView: UITextView! 

    @IBOutlet weak var thatTextField: UITextField! 
    @IBOutlet weak var thisTextField: UITextField! 
    var presenter: PhotoShareModuleInterface! 
    var image: UIImage! 


    @IBAction func thisUploadPhoto(_ sender: Any) { 

     if thisTextField.text != "" //&& thatTextField.text != ""{ 
      performSegue(withIdentifier: "segue", sender: self) 
     } 
    } 


    override func prepare(for segue: UIStoryboardSegue, sender: Any?) { 

     var photoShareLabelViewController = segue.destination as! PhotoShareLabelViewController 

     photoShareLabelViewController.thisString = thisTextField.text! 

     // photoShareLabelViewController.thatString = thatTextField.text! 

    } 

    override func viewWillAppear(_ animated: Bool) { 
     super.viewWillAppear(animated) 

     imageView.image = image 
    } 

    override var prefersStatusBarHidden: Bool { 
     return true 
    } 

    @IBAction func didTapCancel(_ sender: AnyObject) { 
     presenter.cancel() 
     presenter.pop() 
    } 

    @IBAction func didTapDone(_ sender: AnyObject) { 
     guard let message = thatTextField.text, !message.isEmpty else { 
      return 
     } 
     guard let messageOne = thisTextField.text, !messageOne.isEmpty else { 
      return 
     } 

     presenter.finish(with: image, content:message) 
     presenter.dismiss() 
    } 
} 

extension PhotoShareViewController: PhotoShareViewInterface { 

    var controller: UIViewController? { 
     return self 
    } 
} 

PhotoShareLabelViewController：

import UIKit 

class PhotoShareLabelViewController: UIViewController { 

    @IBOutlet weak var thisLabel: UILabel! 

    @IBOutlet weak var thatLabel: UILabel! 

    @IBOutlet weak var thisButton: UIButton! 

    @IBOutlet weak var thatButton: UIButton! 


    var thisString = String() 

    // var thatString = String() 

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) { 
     thisLabel.text = thisString 

     thisButton.setTitle(thisString, for: UIControlState.normal) 

    // thatLabel.text = thatString 

    // thatButton.setTitle(thatString, for: UIControlState.normal) 

    } 

    override func viewDidLoad() { 
     super.viewDidLoad() 
     // Do any additional setup after loading the view. 
    } 

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


    /* 
    // MARK: - Navigation 

    // In a storyboard-based application, you will often want to do a little preparation before navigation 
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) { 
    // Get the new view controller using segue.destinationViewController. 
    // Pass the selected object to the new view controller. 
    } 
    */ 

} 

我想知道为什么会这样。我在故事板上检查了所有的IBOutlets和IBActions，他们似乎工作正常。我认为它出现错误的代码是我的segue。代码工作正常，直到我试图在两个视图控制器之间传递数据。

我做同样的事情在一个完全空的Xcode项目和传递数据的代码似乎正常工作，但是当我试图把它放在我的实际工作区好像有问题。

与此错误任何帮助将是真棒！

Answer 1

你在你的故事板连接到您的控制器出口的视图。但是你删除了这个插座。

转到您的故事板，控制+点击查看和删除通过点击X之间的连接。