我有一个iOS应用程序，在所有设备上工作得非常好，除非他们使用iOS 12。我不确定问题出在哪里。我试过直接从我的笔记本电脑上下载应用程序，它工作得很好。但是，当它从App Store或TestFlight下载时，它在启动时崩溃。
这是我的崩溃日志。
Exception Type: EXC_CRASH (SIGKILL)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Termination Reason: Namespace SPRINGBOARD, Code 0x8badf00d
Termination Description: SPRINGBOARD, scene-create watchdog transgression: com.X.X exhausted real (wall clock) time allowance of 18.98 seconds | ProcessVisibility: Background | ProcessState: Running | WatchdogEvent: scene-create | WatchdogVisibility: Foreground | WatchdogCPUStatistics: ( | "Elapsed total CPU time (seconds): 4.380 (user 4.380, system 0.000), 24% CPU", | "Elapsed application CPU time (seconds): 1.411, 8% CPU" | )
Triggered by Thread: 0
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0 libsystem_kernel.dylib 0x000000018b1f6ac4 __msync + 8
1 Realm 0x0000000101485044 realm::util::msync+ 3117124 (int, void*, unsigned long) + 216
2 Realm 0x0000000101391078 realm::GroupWriter::commit+ 2117752 (unsigned long) + 264
3 Realm 0x000000010138bde0 realm::SharedGroup::low_level_commit+ 2096608 (unsigned long long) + 344
4 Realm 0x000000010138b978 realm::SharedGroup::do_commit+ 2095480 () + 96
5 Realm 0x000000010138c184 realm::SharedGroup::commit_and_continue_as_read+ 2097540 () + 44
6 Realm 0x00000001011ceccc realm::_impl::RealmCoordinator::commit_write+ 273612 (realm::Realm&) + 76
7 Realm 0x00000001012a20f8 realm::Realm::commit_transaction+ 1138936 () + 168
8 Realm 0x0000000101271628 -[RLMRealm commitWriteTransactionWithoutNotifying:error:] + 288
9 RealmSwift 0x000000010172826c Realm.write<A>(withoutNotifying:_:) + 115308 (Realm.swift:280)
10 MYAPP 0x0000000100c7f820 specialized JSONSerializer.serialize(input:) + 178208 (JSONSerializer.swift:30)
11 MYAPP 0x0000000100cd6fa4 specialized AppDelegate.setUpRealm() + 536484 (AppDelegate.swift:235)
12 MYAPP 0x0000000100cd5e14 @objc AppDelegate.application(_:didFinishLaunchingWithOptions:) + 531988 (<compiler-generated>:20)
13 UIKitCore 0x00000001b7e400f0 -[UIApplication _handleDelegateCallbacksWithOptions:isSuspended:restoreState:] + 412
14 UIKitCore 0x00000001b7e41854 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 3352
15 UIKitCore 0x00000001b7e46fe0 -[UIApplication _runWithMainScene:transitionContext:completion:] + 1540
16 UIKitCore 0x00000001b770a2a4 __111-[__UICanvasLifecycleMonitor_Compatability _scheduleFirstCommitForScene:transition:firstActivation:completion:]_block_invoke + 776
17 UIKitCore 0x00000001b771283c +[_UICanvas _enqueuePostSettingUpdateTransactionBlock:] + 160
18 UIKitCore 0x00000001b7709f28 -[__UICanvasLifecycleMonitor_Compatability _scheduleFirstCommitForScene:transition:firstActivation:completion:] + 236
19 UIKitCore 0x00000001b770a818 -[__UICanvasLifecycleMonitor_Compatability activateEventsOnly:withContext:completion:] + 1064
20 UIKitCore 0x00000001b7708b64 __82-[_UIApplicationCanvas _transitionLifecycleStateWithTransitionContext:completion:]_block_invoke + 744
21 UIKitCore 0x00000001b770882c -[_UIApplicationCanvas _transitionLifecycleStateWithTransitionContext:completion:] + 428
22 UIKitCore 0x00000001b770d36c __125-[_UICanvasLifecycleSettingsDiffAction performActionsForCanvas:withUpdatedScene:settingsDiff:fromSettings:transitionContext:]_block_invoke + 220
23 UIKitCore 0x00000001b770e150 _performActionsWithDelayForTransitionContext + 112
24 UIKitCore 0x00000001b770d224 -[_UICanvasLifecycleSettingsDiffAction performActionsForCanvas:withUpdatedScene:settingsDiff:fromSettings:transitionContext:] + 244
25 UIKitCore 0x00000001b7711f24 -[_UICanvas scene:didUpdateWithDiff:transitionContext:completion:] + 360
26 UIKitCore 0x00000001b7e455e8 -[UIApplication workspace:didCreateScene:withTransitionContext:completion:] + 540
27 UIKitCore 0x00000001b7a41e04 -[UIApplicationSceneClientAgent scene:didInitializeWithEvent:completion:] + 360
28 FrontBoardServices 0x000000018dfd79fc -[FBSSceneImpl _didCreateWithTransitionContext:completion:] + 440
29 FrontBoardServices 0x000000018dfe140c __56-[FBSWorkspace client:handleCreateScene:withCompletion:]_block_invoke_2 + 256
30 FrontBoardServices 0x000000018dfe0c14 __40-[FBSWorkspace _performDelegateCallOut:]_block_invoke + 64
31 libdispatch.dylib 0x000000018b0997d4 _dispatch_client_callout + 16
32 libdispatch.dylib 0x000000018b03e5dc _dispatch_block_invoke_direct$VARIANT$mp + 224
33 FrontBoardServices 0x000000018e012040 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 40
34 FrontBoardServices 0x000000018e011cdc -[FBSSerialQueue _performNext] + 408
35 FrontBoardServices 0x000000018e012294 -[FBSSerialQueue _performNextFromRunLoopSource] + 52
36 CoreFoundation 0x000000018b5ecf1c __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24
37 CoreFoundation 0x000000018b5ece9c __CFRunLoopDoSource0 + 88
38 CoreFoundation 0x000000018b5ec784 __CFRunLoopDoSources0 + 176
39 CoreFoundation 0x000000018b5e76c0 __CFRunLoopRun + 1004
40 CoreFoundation 0x000000018b5e6fb4 CFRunLoopRunSpecific + 436
41 GraphicsServices 0x000000018d7e879c GSEventRunModal + 104
42 UIKitCore 0x00000001b7e48c38 UIApplicationMain + 212
43 MYAPP 0x0000000100c5a274 main + 25204 (LanguageExampleCell.swift:16)
44 libdyld.dylib 0x000000018b0aa8e0 start + 4
我在第一次启动应用程序时，就把一个大型的Realm数据库序列化了 I serialize a large Realm database the first time the app launch. 这是导致问题的原因吗？我没有办法找出答案，因为当我通过电脑安装应用时不会发生这种情况。
8badfood 是一个看门狗定时器异常。你必须退出 didFinishLaunching 与尽快呈现一个视图。
如果你必须加载大量的数据，那么你应该呈现一个初始的 "加载 "视图，并执行加载，一旦加载完成就转到实际的UI。
这是为了避免给用户留下应用刚刚 "挂掉 "的印象。
事实上，你只有在iOS 12设备上才会出现崩溃的情况，这可能是因为它们是较老、较慢的设备。