ios - 应用程序崩溃并出现错误 : "this class is not key value coding-compliant for the key tableView". 如何修复？

Question

我在 buttonPressed IBAction 中连接了 10 个带有不同标签的 UIButton，我的 segue 的 ID 为“GoToDetailVC”

import UIKit

class MainVC: UIViewController {

var buttonNumber: Int?

override func viewDidLoad() {
    super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}

@IBAction func buttonPressed(sender: AnyObject) {
    buttonNumber = sender.tag
    performSegue(withIdentifier: "GoToDetailVC", sender: sender.tag)
}

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if let destination = segue.destination as? DetailVC {
        if let btnNumber = sender as? Int {
            destination.buttonNumber = btnNumber
        }
    }
}
}

然后我想用标签中的数字替换 headerLabel 文本

import UIKit

class DetailVC: UIViewController {

@IBOutlet weak var headerLabel: UILabel!

private var _buttonNumber: Int!

var buttonNumber: Int {
    get {
        return _buttonNumber
    }   set {
        _buttonNumber = newValue
    }
}

override func viewDidLoad() {
    super.viewDidLoad()
    headerLabel.text = "\(_buttonNumber!)"
}
override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}

@IBAction func dismissView(_ sender: UIButton) {
    dismiss(animated: true, completion: nil)        
}
}

它正在崩溃并产生此消息

2016-12-31 12:36:36.439 Core Geometry[2638:539019] *** Terminating app     due to uncaught exception 'NSUnknownKeyException', reason:     '[<Core_Geometry.DetailVC 0x7fc55251aea0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key tableView.'
*** First throw call stack:
(
    0   CoreFoundation                      0x0000000108a67d4b __exceptionPreprocess + 171
1   libobjc.A.dylib                     0x000000010615b21e objc_exception_throw + 48
2   CoreFoundation                      0x0000000108a67c99 -[NSException raise] + 9
3   Foundation                          0x0000000105c699df -[NSObject(NSKeyValueCoding) setValue:forKey:] + 291
4   UIKit                               0x00000001067be293 -[UIViewController setValue:forKey:] + 88
5   UIKit                               0x0000000106a3279e -[UIRuntimeOutletConnection connect] + 109
6   CoreFoundation                      0x0000000108a0c9e0 -[NSArray makeObjectsPerformSelector:] + 256
7   UIKit                               0x0000000106a31122 -[UINib instantiateWithOwner:options:] + 1867
8   UIKit                               0x00000001067c49c5 -[UIViewController _loadViewFromNibNamed:bundle:] + 386
9   UIKit                               0x00000001067c52e7 -[UIViewController loadView] + 177
10  UIKit                               0x00000001067c561c -[UIViewController loadViewIfRequired] + 201
11  UIKit                               0x00000001067c5e70 -[UIViewController view] + 27
12  UIKit                               0x00000001070866a4 -[_UIFullscreenPresentationController _setPresentedViewController:] + 87
13  UIKit                               0x00000001067a0702 -[UIPresentationController initWithPresentedViewController:presentingViewController:] + 141
14  UIKit                               0x00000001067d8e97 -[UIViewController _presentViewController:withAnimationController:completion:] + 3956
15  UIKit                               0x00000001067dc26b -[UIViewController _performCoordinatedPresentOrDismiss:animated:] + 530
16  UIKit                               0x00000001067dbd51 -[UIViewController presentViewController:animated:completion:] + 179
17  UIKit                               0x0000000106de9717 __74-[UIStoryboardPresentationSegueTemplate newDefaultPerformHandlerForSegue:]_block_invoke + 133
18  UIKit                               0x0000000106df91dd -[UIStoryboardSegueTemplate _performWithDestinationViewController:sender:] + 447
19  UIKit                               0x0000000106df8fed -[UIStoryboardSegueTemplate _perform:] + 82
20  UIKit                               0x00000001067c8a1f -[UIViewController performSegueWithIdentifier:sender:] + 99
21  Core Geometry                       0x00000001056c6de1 _TFC13Core_Geometry6MainVC13buttonPressedfT6senderPs9AnyObject__T_ + 465
22  Core Geometry                       0x00000001056c6f86 _TToFC13Core_Geometry6MainVC13buttonPressedfT6senderPs9AnyObject__T_ + 54
23  UIKit                               0x00000001066258bc -[UIApplication sendAction:to:from:forEvent:] + 83
24  UIKit                               0x00000001067abc38 -[UIControl sendAction:to:forEvent:] + 67
25  UIKit                               0x00000001067abf51 -[UIControl _sendActionsForEvents:withEvent:] + 444
26  UIKit                               0x00000001067aae4d -[UIControl touchesEnded:withEvent:] + 668
27  UIKit                               0x0000000106693545 -[UIWindow _sendTouchesForEvent:] + 2747
28  UIKit                               0x0000000106694c33 -[UIWindow sendEvent:] + 4011
29  UIKit                               0x00000001066419ab -[UIApplication sendEvent:] + 371
30  UIKit                               0x0000000106e2e72d __dispatchPreprocessedEventFromEventQueue + 3248
31  UIKit                               0x0000000106e27463 __handleEventQueue + 4879
32  CoreFoundation                      0x0000000108a0c761 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
33  CoreFoundation                      0x00000001089f198c __CFRunLoopDoSources0 + 556
34  CoreFoundation                      0x00000001089f0e76 __CFRunLoopRun + 918
35  CoreFoundation                      0x00000001089f0884 CFRunLoopRunSpecific + 420
36  GraphicsServices                    0x000000010a965a6f GSEventRunModal + 161
37  UIKit                               0x0000000106623c68 UIApplicationMain + 159
38  Core Geometry                       0x00000001056c654f main + 111
39  libdyld.dylib                       0x0000000105b8768d start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb) 

Answer 1

显然您的 nib 文件有问题。首先尝试删除 tableView 和其他 View 之间的所有连接。这意味着所有导出 (IBOutlet) 和操作 (IBAction)。崩溃很可能会消失。之后您可以再次尝试重新连接 socket 和 Action ，但请确保操作正确。导致错误指出您正在使用 tableView 连接到一个类，但它没有名为 tableView 的键(属性)。因此，您可能会尝试与错误的类/对象建立联系。