iOS11 WKWebview crash due to NSInvalidUnarchiveOperationException

With ObjectiveC I am developing a SingleView app targeting iOS 11 having one view controller/view. In the Main.storyboard on top of the view I've dropped a WebKit View (WKWebView).

I am seeing a crash in both the Simulator and on an iPhone 6 running iOS 11.0.1 :

Terminating app due to uncaught exception 'NSInvalidUnarchiveOperationException', reason: 'Could not instantiate class named WKWebView'

Do I need anything else to have it working ? Looks like it's unable to instantiate WKWebView upon waking from storyboard.

Other details:

• Xcode version 9.0 9A235

• When I remove the WKWebView from the Storyboard the crash goes away

• App Base SDK - latest iOS (iOS 11); Deployment target 11.0

• Using the WebView(deprecated) -- UIWebView, it works

• I did not attempt to instantiate it manually

Crash stack:

2017-11-06 18:38:27.765519+0200 XYZZMap[15689:1093338] *** Terminating app due to uncaught exception 'NSInvalidUnarchiveOperationException', reason: 'Could not instantiate class named WKWebView'
*** First throw call stack:
(
	0   CoreFoundation                      0x00000001056d01cb __exceptionPreprocess + 171
	1   libobjc.A.dylib                     0x0000000105032f41 objc_exception_throw + 48
	2   CoreFoundation                      0x0000000105744b95 +[NSException raise:format:] + 197
	3   UIKit                               0x000000010692d2c0 UINibDecoderDecodeObjectForValue + 323
	4   UIKit                               0x000000010692d5db UINibDecoderDecodeObjectForValue + 1118
	5   UIKit                               0x000000010692d172 -[UINibDecoder decodeObjectForKey:] + 89
	6   UIKit                               0x00000001062f866b -[UIView initWithCoder:] + 969
	7   UIKit                               0x000000010692d43d UINibDecoderDecodeObjectForValue + 704
	8   UIKit                               0x000000010692d172 -[UINibDecoder decodeObjectForKey:] + 89
	9   UIKit                               0x00000001066dd1a7 -[UIRuntimeConnection initWithCoder:] + 178
	10  UIKit                               0x000000010692d43d UINibDecoderDecodeObjectForValue + 704
	11  UIKit                               0x000000010692d5db UINibDecoderDecodeObjectForValue + 1118
	12  UIKit                               0x000000010692d172 -[UINibDecoder decodeObjectForKey:] + 89
	13  UIKit                               0x00000001066dc3a4 -[UINib instantiateWithOwner:options:] + 1262
	14  UIKit                               0x00000001063f8d07 -[UIViewController _loadViewFromNibNamed:bundle:] + 383
	15  UIKit                               0x00000001063f9610 -[UIViewController loadView] + 177
	16  UIKit                               0x00000001063f9941 -[UIViewController loadViewIfRequired] + 195
	17  UIKit                               0x00000001063fa19e -[UIViewController view] + 27
	18  UIKit                               0x00000001062cdd17 -[UIWindow addRootViewControllerViewIfPossible] + 122
	19  UIKit                               0x00000001062ce41f -[UIWindow _setHidden:forced:] + 294
	20  UIKit                               0x00000001062e12bf -[UIWindow makeKeyAndVisible] + 42
	21  UIKit                               0x0000000106255015 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 4711
	22  UIKit                               0x000000010625a245 -[UIApplication _runWithMainScene:transitionContext:completion:] + 1720
	23  UIKit                               0x0000000106615c6c __111-[__UICanvasLifecycleMonitor_Compatability _scheduleFirstCommitForScene:transition:firstActivation:completion:]_block_invoke + 924
	24  UIKit                               0x00000001069e33ef +[_UICanvas _enqueuePostSettingUpdateTransactionBlock:] + 153
	25  UIKit                               0x0000000106615865 -[__UICanvasLifecycleMonitor_Compatability _scheduleFirstCommitForScene:transition:firstActivation:completion:] + 249
	26  UIKit                               0x00000001066160c3 -[__UICanvasLifecycleMonitor_Compatability activateEventsOnly:withContext:completion:] + 668
	27  UIKit                               0x0000000106f73c11 __82-[_UIApplicationCanvas _transitionLifecycleStateWithTransitionContext:completion:]_block_invoke + 262
	28  UIKit                               0x0000000106f73aca -[_UIApplicationCanvas _transitionLifecycleStateWithTransitionContext:completion:] + 444
	29  UIKit                               0x0000000106c61b9c __125-[_UICanvasLifecycleSettingsDiffAction performActionsForCanvas:withUpdatedScene:settingsDiff:fromSettings:transitionContext:]_block_invoke + 420
	30  UIKit                               0x0000000106e5cc3e _performActionsWithDelayForTransitionContext + 100
	31  UIKit                               0x0000000106c61998 -[_UICanvasLifecycleSettingsDiffAction performActionsForCanvas:withUpdatedScene:settingsDiff:fromSettings:transitionContext:] + 231
	32  UIKit                               0x00000001069e2a4c -[_UICanvas scene:didUpdateWithDiff:transitionContext:completion:] + 392
	33  UIKit                               0x0000000106258ac6 -[UIApplication workspace:didCreateScene:withTransitionContext:completion:] + 523
	34  UIKit                               0x0000000106821523 -[UIApplicationSceneClientAgent scene:didInitializeWithEvent:completion:] + 369
	35  FrontBoardServices                  0x000000010b539158 -[FBSSceneImpl _didCreateWithTransitionContext:completion:] + 338
	36  FrontBoardServices                  0x000000010b541c4d __56-[FBSWorkspace client:handleCreateScene:withCompletion:]_block_invoke_2 + 235
	37  libdispatch.dylib                   0x00000001096b643c _dispatch_client_callout + 8
	38  libdispatch.dylib                   0x00000001096bbaf4 _dispatch_block_invoke_direct + 592
	39  FrontBoardServices                  0x000000010b56d672 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 24
	40  FrontBoardServices                  0x000000010b56d328 -[FBSSerialQueue _performNext] + 464
	41  FrontBoardServices                  0x000000010b56d897 -[FBSSerialQueue _performNextFromRunLoopSource] + 45
	42  CoreFoundation                      0x00000001056732b1 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
	43  CoreFoundation                      0x0000000105712d31 __CFRunLoopDoSource0 + 81
	44  CoreFoundation                      0x0000000105657c19 __CFRunLoopDoSources0 + 185
	45  CoreFoundation                      0x00000001056571ff __CFRunLoopRun + 1279
	46  CoreFoundation                      0x0000000105656a89 CFRunLoopRunSpecific + 409
	47  GraphicsServices                    0x000000010be609c6 GSEventRunModal + 62
	48  UIKit                               0x000000010625bd30 UIApplicationMain + 159
	49  XYZZMap                             0x00000001047274bf main + 111
	50  libdyld.dylib                       0x0000000109732d81 start + 1
	51  ???                                 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException

Thanks!

NSInvalidUnarchiveOperationException when loading the nib / storyboard means there an object in the nib / storyboard that the runtime doesn't understand. This is because the framework that defines that kind of object is missing.

So, in this case, you need to link your app target against the WebKit framework so that the app understands what a WKWebView is when it is decoded from the storyboard.

Here's a screen shot showing the app target's Build Phases when this is correctly configured:

Select Target -> General -> Linked framework and libraries -> click on + symbol below -> search for webKit.Framwork -> add.

Update for swift 5.0 ++ And Xcode- 11.5 +

If you faced this issue which I mentioned below after linked WKWebView in storyboard.

> NSInvalidUnarchiveOperationException', reason: 'Could not instantiate > class named WKWebView because no class named WKWebView was found; the > class needs to be defined in source code or linked in from a library > (ensure the class is part of the correct target)

Just follow this instruction to solve this in new Xcode.

Here's a screen shot showing the project target's Build Phases when this is correctly configured:

Check whether on the storyboard you have a WKWebView instance while in code you may have a UIWebView instance

Click on Project Target and then add webKit.Framwork as display below :

General -> Linked framework and libraries -> click on + symbol below -> search for webKit.Framwork -> add.

I too faced same kind of issue.

Without declaring WKWebView as Outlet

Got this error while running in simulator

After adding Outlet it worked fine for me.

Hope this helps :)