我在我的旧Mac上有一个Xcode Project，我完成了构建（Xcode版本9.4.1）。它可以正常工作，并且可以在AppStore中上传。因为我的Mac无法运行MacOS Mojave，所以当我在那里运行项目时，我借了另一个带有最新Xcode版本（10.1）的Mac，我会得到以下例外：
2019-03-03 11:21:20.941643+0100 Schoolcheck_Schüler[6018:110054] libMobileGestalt MobileGestalt.c:890: MGIsDeviceOneOfType is not supported on this platform.
2019-03-03 11:21:21.052628+0100 Schoolcheck_Schüler[6018:110054] Unknown class _TtC20Schoolcheck_Schüler12ChooseSchool in Interface Builder file.
2019-03-03 11:21:21.086624+0100 Schoolcheck_Schüler[6018:110054] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<UIViewController 0x7fbab841cf20> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key LabelSchoolName.'
*** First throw call stack:
(
0 CoreFoundation 0x0000000110e761bb __exceptionPreprocess + 331
1 libobjc.A.dylib 0x0000000110414735 objc_exception_throw + 48
2 CoreFoundation 0x0000000110e75d29 -[NSException raise] + 9
3 Foundation 0x000000010fe3fde4 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 292
4 UIKitCore 0x0000000116708292 -[UIViewController setValue:forKey:] + 87
5 UIKitCore 0x000000011699f573 -[UIRuntimeOutletConnection connect] + 109
6 CoreFoundation 0x0000000110e61cfd -[NSArray makeObjectsPerformSelector:] + 317
7 UIKitCore 0x000000011699c2b9 -[UINib instantiateWithOwner:options:] + 1814
8 UIKitCore 0x000000011670f452 -[UIViewController _loadViewFromNibNamed:bundle:] + 383
9 UIKitCore 0x000000011670fddc -[UIViewController loadView] + 177
10 UIKitCore 0x00000001167100ee -[UIViewController loadViewIfRequired] + 175
11 UIKitCore 0x0000000116710940 -[UIViewController view] + 27
12 UIKitCore 0x0000000116d67c53 -[UIWindow addRootViewControllerViewIfPossible] + 122
13 UIKitCore 0x0000000116d6836e -[UIWindow _setHidden:forced:] + 294
14 UIKitCore 0x0000000116d7b5c0 -[UIWindow makeKeyAndVisible] + 42
15 UIKitCore 0x0000000116d28833 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 4595
16 UIKitCore 0x0000000116d2dc2f -[UIApplication _runWithMainScene:transitionContext:completion:] + 1623
17 UIKitCore 0x000000011654c4e9 __111-[__UICanvasLifecycleMonitor_Compatability _scheduleFirstCommitForScene:transition:firstActivation:completion:]_block_invoke + 866
18 UIKitCore 0x000000011655529c +[_UICanvas _enqueuePostSettingUpdateTransactionBlock:] + 153
19 UIKitCore 0x000000011654c126 -[__UICanvasLifecycleMonitor_Compatability _scheduleFirstCommitForScene:transition:firstActivation:completion:] + 233
20 UIKitCore 0x000000011654cae0 -[__UICanvasLifecycleMonitor_Compatability activateEventsOnly:withContext:completion:] + 1085
21 UIKitCore 0x000000011654acb5 __82-[_UIApplicationCanvas _transitionLifecycleStateWithTransitionContext:completion:]_block_invoke + 795
22 UIKitCore 0x000000011654a95f -[_UIApplicationCanvas _transitionLifecycleStateWithTransitionContext:completion:] + 435
23 UIKitCore 0x000000011654fa90 __125-[_UICanvasLifecycleSettingsDiffAction performActionsForCanvas:withUpdatedScene:settingsDiff:fromSettings:transitionContext:]_block_invoke + 584
24 UIKitCore 0x000000011655080e _performActionsWithDelayForTransitionContext + 100
25 UIKitCore 0x000000011654f7ef -[_UICanvasLifecycleSettingsDiffAction performActionsForCanvas:withUpdatedScene:settingsDiff:fromSettings:transitionContext:] + 221
26 UIKitCore 0x000000011655493a -[_UICanvas scene:didUpdateWithDiff:transitionContext:completion:] + 392
27 UIKitCore 0x0000000116d2c44e -[UIApplication workspace:didCreateScene:withTransitionContext:completion:] + 515
28 UIKitCore 0x00000001168d0d09 -[UIApplicationSceneClientAgent scene:didInitializeWithEvent:completion:] + 357
29 FrontBoardServices 0x000000011d8dd2da -[FBSSceneImpl _didCreateWithTransitionContext:completion:] + 448
30 FrontBoardServices 0x000000011d8e8443 __56-[FBSWorkspace client:handleCreateScene:withCompletion:]_block_invoke_2 + 271
31 FrontBoardServices 0x000000011d8e7b3a __40-[FBSWorkspace _performDelegateCallOut:]_block_invoke + 53
32 libdispatch.dylib 0x00000001143e3602 _dispatch_client_callout + 8
33 libdispatch.dylib 0x00000001143e6b78 _dispatch_block_invoke_direct + 301
34 FrontBoardServices 0x000000011d91cba8 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 30
35 FrontBoardServices 0x000000011d91c860 -[FBSSerialQueue _performNext] + 457
36 FrontBoardServices 0x000000011d91ce40 -[FBSSerialQueue _performNextFromRunLoopSource] + 45
37 CoreFoundation 0x0000000110ddb721 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
38 CoreFoundation 0x0000000110ddaf93 __CFRunLoopDoSources0 + 243
39 CoreFoundation 0x0000000110dd563f __CFRunLoopRun + 1263
40 CoreFoundation 0x0000000110dd4e11 CFRunLoopRunSpecific + 625
41 GraphicsServices 0x000000011a9361dd GSEventRunModal + 62
42 UIKitCore 0x0000000116d2f81d UIApplicationMain + 140
43 Schoolcheck_SchuÃàler 0x000000010f95f494 main + 68
44 libdyld.dylib 0x0000000114459575 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
我在我的外部硬盘驱动器上的旧Mac上运行了该项目，并且效果很好。之后，我尝试在外部硬盘驱动器上的较新的Mac上运行该项目，但它行不通。
我检查了所有课程，每个课程都正确连接。
我还删除了插座的连接并重新连接。它什么都没有。
预先感谢您，
manuel
基于您的崩溃日志。从您的代码中删除了名为LabelSchoolName的IBOUTLET。您可以查看UiviewController参考并重新添加。