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:
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!
You can think of WKWebView as a stripped-down version of Safari. It is responsible to load a URL request and display the web content. WKWebView has the benefit of the Nitro JavaScript engine and offers more features. If you just need to display a specific web page, WKWebView is the best option for this scenario.
Loading a Web Page in WKWebView It's part of the WebKit framework and WKWebView uses the same browser engine as Safari on iOS and Mac. Adding a web view to your app is as simple as adding a UIView or UIButton to your view controller in Interface Builder.
A WKWebView object is a platform-native view that you use to incorporate web content seamlessly into your app's UI. A web view supports a full web-browsing experience, and presents HTML, CSS, and JavaScript content alongside your app's native views.
How to Resolve “Couldn't instantiate class named WKWebView” Error When Using WebKit. @IBOutlet var webView: WKWebView. When accessing the web view, the app quit and showed the error above. To resolve the error, all you need is add the WebKit framework to your Xcode project.
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.
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