iOS11 WKWebview crash due to NSInvalidUnarchiveOperationException - ios

Question

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!

Answer 1

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:

Answer 2

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

Answer 3

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:

Answer 4

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

Answer 5

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.

Answer 6

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 :)