1

Hey swift forums, I’m having trouble launching a completed Rock Paper Scissors game. This is lesson 20 from the introduction to app development with swift iBook. I receive a SIGABRT ERROR, building the app succeeds but then I receive a white screen. Any help at all would be greatly appreciated. Thank you.

DEBUG AREA:

2019-06-23 20:11:20.811780-0400 Rock Paper Scissors[5220:106660] [general] CFLocaleCopyCurrent() failed to look up current locale via 'AppleLocale' and 'AppleLanguages' in user preferences; falling back to locale identifier 'en_US' as the default. Consider checking Console for sandbox violations from this process for reading from preferences, or enabling CoreFoundation debug logging for more information. This will only be logged once.
2019-06-23 20:11:20.984376-0400 Rock Paper Scissors[5220:106523] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<Rock_Paper_Scissors.ViewController 0x7fd609f048a0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key bump.'
*** First throw call stack:
(
	0   CoreFoundation                      0x00000001094f8b6e __exceptionPreprocess + 350
	1   libobjc.A.dylib                     0x0000000107d3ff57 objc_exception_throw + 48
	2   CoreFoundation                      0x00000001094f8739 -[NSException raise] + 9
	3   Foundation                          0x000000010779afc0 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 325
	4   UIKitCore                           0x0000000115a241f5 -[UIViewController setValue:forKey:] + 87
	5   UIKitCore                           0x0000000115d02e12 -[UIRuntimeOutletConnection connect] + 109
	6   CoreFoundation                      0x00000001094e5022 -[NSArray makeObjectsPerformSelector:] + 242
	7   UIKitCore                           0x0000000115cfffba -[UINib instantiateWithOwner:options:] + 2190
	8   UIKitCore                           0x0000000115a2b219 -[UIViewController _loadViewFromNibNamed:bundle:] + 395
	9   UIKitCore                           0x0000000115a2bd25 -[UIViewController loadView] + 177
	10  UIKitCore                           0x0000000115a2c024 -[UIViewController loadViewIfRequired] + 172
	11  UIKitCore                           0x0000000115a2c7d1 -[UIViewController view] + 27
	12  UIKitCore                           0x00000001160be844 -[UIWindow addRootViewControllerViewIfPossible] + 150
	13  UIKitCore                           0x00000001160bef93 -[UIWindow _setHidden:forced:] + 325
	14  UIKitCore                           0x00000001160d1882 -[UIWindow _mainQueue_makeKeyAndVisible] + 42
	15  UIKitCore                           0x00000001160802e8 -[UIApplication _callInitializationDelegatesWithActions:forCanvas:payload:fromOriginatingProcess:] + 4199
	16  UIKitCore                           0x00000001160858ae -[UIApplication _runWithMainScene:transitionContext:completion:] + 1286
	17  UIKitCore                           0x00000001157f2e8c -[_UISceneLifecycleMultiplexer completeApplicationLaunchWithFBSScene:transitionContext:] + 122
	18  UIKitCore                           0x0000000115cbf8a0 _UIScenePerformActionsWithLifecycleActionMask + 78
	19  UIKitCore                           0x00000001157f3993 __101-[_UISceneLifecycleMultiplexer _evalTransitionToSettings:fromSettings:forceExit:withTransitionStore:]_block_invoke + 198
	20  UIKitCore                           0x00000001157f345f -[_UISceneLifecycleMultiplexer _performBlock:withApplicationOfDeactivationReasons:fromReasons:] + 474
	21  UIKitCore                           0x00000001157f37c3 -[_UISceneLifecycleMultiplexer _evalTransitionToSettings:fromSettings:forceExit:withTransitionStore:] + 810
	22  UIKitCore                           0x00000001157f3060 -[_UISceneLifecycleMultiplexer uiScene:transitionedFromState:withTransitionContext:] + 345
	23  UIKitCore                           0x00000001157f73ca __186-[_UIWindowSceneFBSSceneTransitionContextDrivenLifecycleSettingsDiffAction _performActionsForUIScene:withUpdatedFBSScene:settingsDiff:fromSettings:transitionContext:lifecycleActionType:]_block_invoke_2 + 159
	24  UIKitCore                           0x0000000115bea08e +[BSAnimationSettings(UIKit) tryAnimatingWithSettings:actions:completion:] + 845
	25  UIKitCore                           0x0000000115cdd65c _UISceneSettingsDiffActionPerformChangesWithTransitionContext + 240
	26  UIKitCore                           0x00000001157f7009 __186-[_UIWindowSceneFBSSceneTransitionContextDrivenLifecycleSettingsDiffAction _performActionsForUIScene:withUpdatedFBSScene:settingsDiff:fromSettings:transitionContext:lifecycleActionType:]_block_invoke + 171
	27  UIKitCore                           0x0000000115cdd55f _UISceneSettingsDiffActionPerformActionsWithDelayForTransitionContext + 84
	28  UIKitCore                           0x00000001157f6e68 -[_UIWindowSceneFBSSceneTransitionContextDrivenLifecycleSettingsDiffAction _performActionsForUIScene:withUpdatedFBSScene:settingsDiff:fromSettings:transitionContext:lifecycleActionType:] + 359
	29  UIKitCore                           0x00000001156659b7 __64-[UIScene scene:didUpdateWithDiff:transitionContext:completion:]_block_invoke + 657
	30  UIKitCore                           0x0000000115664930 -[UIScene _emitSceneSettingsUpdateResponseForCompletion:afterSceneUpdateWork:] + 374
	31  UIKitCore                           0x00000001156656e1 -[UIScene scene:didUpdateWithDiff:transitionContext:completion:] + 210
	32  UIKitCore                           0x0000000116084126 -[UIApplication workspace:didCreateScene:withTransitionContext:completion:] + 535
	33  UIKitCore                           0x0000000115c0a77d -[UIApplicationSceneClientAgent scene:didInitializeWithEvent:completion:] + 361
	34  FrontBoardServices                  0x0000000111611b69 -[FBSSceneImpl _callOutQueue_agent_didCreateWithTransitionContext:completion:] + 442
	35  FrontBoardServices                  0x000000011163a168 __86-[FBSWorkspaceScenesClient sceneID:createWithParameters:transitionContext:completion:]_block_invoke.160 + 102
	36  FrontBoardServices                  0x000000011161ca99 -[FBSWorkspace _calloutQueue_executeCalloutFromSource:withBlock:] + 220
	37  FrontBoardServices                  0x0000000111639df9 __86-[FBSWorkspaceScenesClient sceneID:createWithParameters:transitionContext:completion:]_block_invoke + 355
	38  libdispatch.dylib                   0x000000010a300ed0 _dispatch_client_callout + 8
	39  libdispatch.dylib                   0x000000010a303e41 _dispatch_block_invoke_direct + 300
	40  FrontBoardServices                  0x000000011166122b __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 30
	41  FrontBoardServices                  0x0000000111660f12 -[FBSSerialQueue _performNext] + 436
	42  FrontBoardServices                  0x0000000111661433 -[FBSSerialQueue _performNextFromRunLoopSource] + 33
	43  CoreFoundation                      0x000000010945c371 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
	44  CoreFoundation                      0x000000010945c301 __CFRunLoopDoSource0 + 81
	45  CoreFoundation                      0x000000010945bad4 __CFRunLoopDoSources0 + 180
	46  CoreFoundation                      0x00000001094567ef __CFRunLoopRun + 1263
	47  CoreFoundation                      0x0000000109455fd6 CFRunLoopRunSpecific + 438
	48  GraphicsServices                    0x0000000110e659f8 GSEventRunModal + 65
	49  UIKitCore                           0x0000000116087722 UIApplicationMain + 1621
	50  Rock Paper Scissors                 0x0000000107413a7b main + 75
	51  libdyld.dylib                       0x000000010a3896ad start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
2

You're missing an @IBOutlet connection to a variable named bump. That's usually the cause of UIViewController classes crashed with the exception about not being "key value coding-compliant".

1 Like
7

I fixed all of the connections and am still receiving an error, help is greatly appreciated.

DEBUG AREA:

2019-06-23 22:33:13.595787-0400 Rock Paper Scissors[7360:166148] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<Rock_Paper_Scissors.ViewController 0x7fc006609790> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key buttons.'

8

I’d be much nicer if you put the debugging statements inside triple tick marks, like this

```
Put code here
```

Also you can make use of the edit button, so you don't nee to delete comment every time you want to change something.

9

Thank you, this is good to know.

import UIKit

class ViewController: UIViewController {
    
    @IBOutlet weak var sign: UILabel!
    @IBOutlet weak var status: UILabel!
    @IBOutlet weak var scissors: UIButton!
    @IBOutlet weak var rock: UIButton!
    @IBOutlet weak var paper: UIButton!
    @IBOutlet weak var playAgain: UIButton!
    
    
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
        resetView()
    }
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    
    func resetView() {
        sign.text = "🤖"
        status.text = "Rock, Paper, Scissors?"
        rock.isHidden = false
        rock.isEnabled = true
        paper.isHidden = false
        paper.isEnabled = true
        scissors.isHidden = false
        scissors.isEnabled = true
        playAgain.isHidden = true
    
    }
    
    func play(_ playerTurn: Sign) {
        rock.isEnabled = false
        paper.isEnabled = false
        scissors.isEnabled = false
       
    let opponent = randomSign()
        sign.text = opponent.emoji
   
        
        let gameState = playerTurn.turns(opponent)
        
        switch gameState {
        case .draw:
            status.text = "It's a tie!"
        case .lose:
            status.text = "Sorry, you lost..."
        case .win:
            status.text = "Congratulations, you won!"
        case .start:
            status.text = "Rock, Paper, Scissors?"
        }
    
        switch playerTurn {
        case .rock:
            rock.isHidden = false
            paper.isHidden = true
            scissors.isHidden = true
        case .paper:
            rock.isHidden = true
            paper.isHidden = false
            scissors.isHidden = true
        case .scissors:
            rock.isHidden = true
            paper.isHidden = true
            scissors.isHidden = false
        }
    playAgain.isHidden = false
        
    
    }
    
    @IBAction func scissorsSelect(_ sender: Any) {
    play(Sign.scissors)
    }
    
    @IBAction func rockSelect(_ sender: Any) {
    play(Sign.rock)
    }
    
    
    @IBAction func paperSelect(_ sender: Any) {
    play(Sign.paper)
    }
    
    @IBAction func playAgainSelect(_ sender: Any) {
    resetView()
    }
    
}
10

It's still much of the same error. The story board tries to set a value for variable named button in your ViewController, but it couldn't.

  • If your ViewController indeed has variable buttons, you might want to check that it's proper @IBObject.
  • If your ViewController doesn't have buttons, then storyboard incorrectly think that it does. You might want to go in and fix it in storyboard.
11

Thanks this sort of helped, regardless problem solved. Thanks

1 Like