title: iOS11 WKWebview crash due to NSInvalidUnarchiveOperationException
body: <p>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). </p>
  
  <p>I am seeing a crash in both the Simulator and on an iPhone 6 running iOS 11.0.1 :</p>
  
  <p><strong>Terminating app due to uncaught exception 'NSInvalidUnarchiveOperationException', reason: 'Could not instantiate class named WKWebView'</strong></p>
  
  <p>Do I need anything else to have it working ? Looks like it's unable to instantiate WKWebView upon waking from storyboard.</p>
  
  <p>Other details:</p>
  
  <ul>
  <li>Xcode version 9.0 9A235</li>
  <li>When I remove the WKWebView from the Storyboard the crash goes away</li>
  <li>App Base SDK - latest iOS (iOS 11); Deployment target 11.0</li>
  <li>Using the WebView(deprecated) -- UIWebView, it works</li>
  <li>I did not attempt to instantiate it manually</li>
  </ul>
  
  <p>Crash stack:</p>
  
  <pre><code>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
  </code></pre>
  
  <p>Thanks!</p>