Detailed crash log 2021-10-01 10:38:40.146584+0200 CustomViewControllerInit[62559:627294] *** Assertion failure in UITraitCollection *UIViewControllerMissingInitialTraitCollection(UIViewController *__strong)(), UIViewController.m:2434 2021-10-01 10:38:40.155555+0200 CustomViewControllerInit[62559:627294] *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'UIViewController is missing its initial trait collection populated during initialization. This is a serious bug, likely caused by accessing properties or methods on the view controller before calling a UIViewController initializer. View controller: <UITableViewController: 0x7fe1a7407580>' *** First throw call stack: ( 0 CoreFoundation 0x00007fff203fbbb4 __exceptionPreprocess + 242 1 libobjc.A.dylib 0x00007fff2019ebe7 objc_exception_throw + 48 2 Foundation 0x00007fff20750da9 -[NSMutableDictionary(NSMutableDictionary) classForCoder] + 0 3 UIKitCore 0x00007fff2483b6c6 UIViewControllerMissingInitialTraitCollection + 188 4 UIKitCore 0x00007fff2483fbef -[UIViewController traitCollection] + 155 5 UIKitCore 0x00007fff2482e93a -[UITableViewController dealloc] + 196 6 CustomViewControllerInit 0x000000010d33ea3d $s24CustomViewControllerInit0a5TablebC0CACycfc + 157 7 CustomViewControllerInit 0x000000010d33ea6f $s24CustomViewControllerInit0a5TablebC0CACycfcTo + 15 8 CustomViewControllerInit 0x000000010d33e99b $s24CustomViewControllerInit0a5TablebC0CACycfC + 27 9 CustomViewControllerInit 0x000000010d33d50d $s24CustomViewControllerInit0bC0C11viewDidLoadyyF + 109 10 CustomViewControllerInit 0x000000010d33d55c $s24CustomViewControllerInit0bC0C11viewDidLoadyyFTo + 28 11 UIKitCore 0x00007fff2483d2f0 -[UIViewController _sendViewDidLoadWithAppearanceProxyObjectTaggingEnabled] + 88 12 UIKitCore 0x00007fff24841cf4 -[UIViewController loadViewIfRequired] + 1187 13 UIKitCore 0x00007fff248420fc -[UIViewController view] + 27 14 UIKitCore 0x00007fff2503eb8b -[UIWindow addRootViewControllerViewIfPossible] + 313 15 UIKitCore 0x00007fff2503e279 -[UIWindow _updateLayerOrderingAndSetLayerHidden:actionBlock:] + 222 16 UIKitCore 0x00007fff2503f26a -[UIWindow _setHidden:forced:] + 409 17 UIKit 0x00007fff5963dc30 -[UIWindowAccessibility _orderFrontWithoutMakingKey] + 126 18 UIKitCore 0x00007fff25051e5a -[UIWindow _mainQueue_makeKeyAndVisible] + 47 19 UIKitCore 0x00007fff252bd80c -[UIWindowScene _makeKeyAndVisibleIfNeeded] + 202 20 UIKitCore 0x00007fff24386def +[UIScene _sceneForFBSScene:create:withSession:connectionOptions:] + 1605 21 UIKitCore 0x00007fff24ffd75c -[UIApplication _connectUISceneFromFBSScene:transitionContext:] + 1253 22 UIKitCore 0x00007fff24ffdc0b -[UIApplication workspace:didCreateScene:withTransitionContext:completion:] + 289 23 UIKitCore 0x00007fff24a7e62e -[UIApplicationSceneClientAgent scene:didInitializeWithEvent:completion:] + 358 24 FrontBoardServices 0x00007fff26483d98 -[FBSScene _callOutQueue_agent_didCreateWithTransitionContext:completion:] + 419 25 FrontBoardServices 0x00007fff264b04a3 __94-[FBSWorkspaceScenesClient createWithSceneID:groupID:parameters:transitionContext:completion:]_block_invoke.180 + 102 26 FrontBoardServices 0x00007fff2649221a -[FBSWorkspace _calloutQueue_executeCalloutFromSource:withBlock:] + 209 27 FrontBoardServices 0x00007fff264b0082 __94-[FBSWorkspaceScenesClient createWithSceneID:groupID:parameters:transitionContext:completion:]_block_invoke + 352 28 libdispatch.dylib 0x000000010d4e8c0c _dispatch_client_callout + 8 29 libdispatch.dylib 0x000000010d4ebb7f _dispatch_block_invoke_direct + 295 30 FrontBoardServices 0x00007fff264d6dc8 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 30 31 FrontBoardServices 0x00007fff264d6cbe -[FBSSerialQueue _targetQueue_performNextIfPossible] + 174 32 FrontBoardServices 0x00007fff264d6df0 -[FBSSerialQueue _performNextFromRunLoopSource] + 19 33 CoreFoundation 0x00007fff20369e25 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17 34 CoreFoundation 0x00007fff20369d1d __CFRunLoopDoSource0 + 180 35 CoreFoundation 0x00007fff20369254 __CFRunLoopDoSources0 + 340 36 CoreFoundation 0x00007fff20363951 __CFRunLoopRun + 875 37 CoreFoundation 0x00007fff20363103 CFRunLoopRunSpecific + 567 38 GraphicsServices 0x00007fff2c851cd3 GSEventRunModal + 139 39 UIKitCore 0x00007fff24ffbe63 -[UIApplication _run] + 928 40 UIKitCore 0x00007fff25000a53 UIApplicationMain + 101 41 libswiftUIKit.dylib 0x00007fff5933d052 $s5UIKit17UIApplicationMainys5Int32VAD_SpySpys4Int8VGGSgSSSgAJtF + 98 42 CustomViewControllerInit 0x000000010d33e088 $sSo21UIApplicationDelegateP5UIKitE4mainyyFZ + 104 43 CustomViewControllerInit 0x000000010d33e017 $s24CustomViewControllerInit11AppDelegateC5$mainyyFZ + 39 44 CustomViewControllerInit 0x000000010d33e108 main + 24 45 dyld 0x000000010d365e1e start_sim + 10 46 ??? 0x0000000000000001 0x0 + 1 ) libc++abi: terminating with uncaught exception of type NSException *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'UIViewController is missing its initial trait collection populated during initialization. This is a serious bug, likely caused by accessing properties or methods on the view controller before calling a UIViewController initializer. View controller: <UITableViewController: 0x7fe1a7407580>' terminating with uncaught exception of type NSException CoreSimulator 776.3 - Device: iPhone 8 (1CCAF02C-6FB7-4DDB-A6F7-3CE9009A2EB2) - Runtime: iOS 15.0 (19A339) - DeviceType: iPhone 8 (lldb)

Although this could be a bug in UIKit, I found three solutions to fix this problem. Don't subclass UITableViewController, see https://stackoverflow.com/a/30719434/1702958 Don't use a convenience initializer, see https://stackoverflow.com/a/69121381/1702958 Prefix the designated initializer with @objc so UIKit finds your designated init method @objc init(data: String) { super.init(style: .plain) self.data = data }

Could be related to https://developer.apple.com/forums/thread/681929

Xcode needs the ~/Library/Developer/XCode/iOS DeviceSupport folder to symbolicate your crash logs. You can delete the complete folder if you want. The next time you connect a device for debugging Xcode is going to copy the symbols from it. For more info check out: https://stackoverflow.com/questions/29930198/can-i-delete-data-from-the-ios-devicesupport-directory