Hello! I've been digging into this for a little bit now, and am hitting something of a wall. Our app is crashing occasionally, and googling the crash yields literally 0 results.
Tl;dr : Something related to adaptivePresentationStyle(for:traitCollection:) is resulting in our app crashing.
In our app, we have a custom UIPresentationController that we use to present a small sheet of content overlaying other app content - similar to a UISheetPresentationController with a medium-ish size. So we have a custom UIViewController to present, and it conforms to the UIAdaptivePresentationControllerDelegate protocol. We also have custom present and dismiss animators.
However, we seem to be running into a really odd crash. I've attached a crash report as well, but here's what one sees in xcode on reproducing the crash:
The _computeToEndFrameForCurrentTransition block is nil inside the _transitionViewForCurrentTransition block, value of outerStrongSelf currently : <XxxYyyyyyZzz.PopupPresentationController: 0x12d017a40>. This most likely indicates that an adaptation is happening after a transtion cleared out _computeToEndFrameForCurrentTransition. Captured debug information outside block: presentationController : <XxxYyyyyyZzz.PopupPresentationController: 0x12d017a40> presentedViewController : <XxxYyyyyyZzz.SomeViewController: 0x12d03a690> presentingViewController : <UINavigationController: 0x12a817400>
2023-09-25_08-02-33.6523_-0500-7d355cd4a86427213389765ef070a777c4b4aaa3.crash
Incident Identifier: 39F8711F-699B-4E97-9122-36AD863DCD63
Hardware Model: iPhone15,2
Process: XxxYyyyyyZzz [4101]
Path: /private/var/containers/Bundle/Application/62F17CD5-0791-4527-88BC-3F4B2CD1C3F6/XxxYyyyyyZzz.app/XxxYyyyyyZzz
Identifier: com.aaaaaaaaaaa.bbbbbbbbb
Version: 1.11.1 (1.11.1.111.1)
AppStoreTools: 14E221
AppVariant: 1:iPhone15,2:16
Code Type: ARM-64 (Native)
Role: Foreground
Parent Process: launchd [1]
Coalition: com.aaaaaaaaaaa.bbbbbbbbb [621]
Date/Time: 2023-09-25 08:02:33.6523 -0500
Launch Time: 2023-09-22 10:04:39.4774 -0500
OS Version: iPhone OS 16.6.1 (20G81)
Release Type: User
Baseband Version: 1.80.02
Report Version: 104
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Termination Reason: SIGNAL 6 Abort trap: 6
Terminating Process: XxxYyyyyyZzz [4101]
Triggered by Thread: 0
Last Exception Backtrace:
0 CoreFoundation 0x1afa28cb4 __exceptionPreprocess + 164 (NSException.m:202)
1 libobjc.A.dylib 0x1a8abc3d0 objc_exception_throw + 60 (objc-exception.mm:356)
2 Foundation 0x1aa1b2688 -[NSAssertionHandler handleFailureInFunction:file:lineNumber:description:] + 172 (NSException.m:251)
3 UIKitCore 0x1b1d05610 __80-[UIPresentationController _initViewHierarchyForPresentationSuperview:inWindow:]_block_invoke + 2588 (UIPresentationController.m:1594)
4 UIKitCore 0x1b21f1ff4 __56-[UIPresentationController runTransitionForCurrentState]_block_invoke_3 + 300 (UIPresentationController.m:1228)
5 UIKitCore 0x1b1c2dca8 -[_UIAfterCACommitBlock run] + 72 (_UIAfterCACommitQueue.m:137)
6 UIKitCore 0x1b1c2dbdc -[_UIAfterCACommitQueue flush] + 168 (_UIAfterCACommitQueue.m:228)
7 UIKitCore 0x1b1c2daf0 _runAfterCACommitDeferredBlocks + 496 (UIApplication.m:3249)
8 UIKitCore 0x1b1acc428 _cleanUpAfterCAFlushAndRunDeferredBlocks + 108 (UIApplication.m:3213)
9 UIKitCore 0x1b1f8b4e4 _UIApplicationFlushCATransaction + 72 (UIApplication.m:3290)
10 UIKitCore 0x1b20dbd94 _UIUpdateSequenceRun + 84 (_UIUpdateSequence.mm:114)
11 UIKitCore 0x1b2740894 schedulerStepScheduledMainSection + 144 (_UIUpdateScheduler.m:1015)
12 UIKitCore 0x1b273fdf0 runloopSourceCallback + 92 (_UIUpdateScheduler.m:1164)
13 CoreFoundation 0x1afaf2128 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 28 (CFRunLoop.c:1957)
14 CoreFoundation 0x1afafe7b4 __CFRunLoopDoSource0 + 176 (CFRunLoop.c:2001)
15 CoreFoundation 0x1afa83648 __CFRunLoopDoSources0 + 340 (CFRunLoop.c:2046)
16 CoreFoundation 0x1afa990d4 __CFRunLoopRun + 828 (CFRunLoop.c:2953)
17 CoreFoundation 0x1afa9e3ec CFRunLoopRunSpecific + 612 (CFRunLoop.c:3418)
18 GraphicsServices 0x1eafb435c GSEventRunModal + 164 (GSEvent.c:2196)
19 UIKitCore 0x1b1e2af58 -[UIApplication _run] + 888 (UIApplication.m:3782)
20 UIKitCore 0x1b1e2abbc UIApplicationMain + 340 (UIApplication.m:5372)
21 XxxYyyyyyZzz 0x100cb8944 main + 96 (main.m:17)
22 dyld 0x1cefd0dec start + 2220 (dyldMain.cpp:1165)
Thread 0 name:
Thread 0 Crashed:
0 libsystem_kernel.dylib 0x00000001ee9e5578 __pthread_kill + 8 (:-1)
1 libsystem_pthread.dylib 0x000000020f860118 pthread_kill + 268 (pthread.c:1670)
2 libsystem_c.dylib 0x00000001b6fa8c04 __abort + 128 (abort.c:155)
3 libsystem_c.dylib 0x00000001b6f50184 abort + 192 (abort.c:126)
4 libc++abi.dylib 0x000000020f79ebf8 abort_message + 132 (:-1)
5 libc++abi.dylib 0x000000020f78e444 demangling_terminate_handler() + 348 (:-1)
6 libobjc.A.dylib 0x00000001a8ac1ea4 _objc_terminate() + 144 (objc-exception.mm:498)
7 FirebaseCrashlytics 0x0000000101242ba0 FIRCLSTerminateHandler() + 340 (FIRCLSException.mm:327)
8 libc++abi.dylib 0x000000020f79dfbc std::__terminate(void (*)()) + 16 (:-1)
9 libc++abi.dylib 0x000000020f7a0f44 __cxa_rethrow + 148 (:-1)
10 libobjc.A.dylib 0x00000001a8abdd5c objc_exception_rethrow + 44 (objc-exception.mm:401)
11 CoreFoundation 0x00000001afa9e4b0 CFRunLoopRunSpecific + 808 (CFRunLoop.c:3434)
12 GraphicsServices 0x00000001eafb435c GSEventRunModal + 164 (GSEvent.c:2196)
13 UIKitCore 0x00000001b1e2af58 -[UIApplication _run] + 888 (UIApplication.m:3782)
14 UIKitCore 0x00000001b1e2abbc UIApplicationMain + 340 (UIApplication.m:5372)
15 XxxYyyyyyZzz 0x0000000100cb8944 main + 96 (main.m:17)
16 dyld 0x00000001cefd0dec start + 2220 (dyldMain.cpp:1165)
Thread 1:
0 libsystem_pthread.dylib 0x000000020f859b74 start_wqthread + 0 (:-1)
Thread 2:
0 libsystem_pthread.dylib 0x000000020f859b74 start_wqthread + 0 (:-1)
Thread 3 name:
Thread 3:
0 CoreFoundation 0x00000001afaa1f38 __CFStringCreateImmutableFunnel3 + 1256 (CFString.c:0)
1 CoreFoundation 0x00000001afaa8700 CFStringCreateWithCString + 96 (CFString.c:1879)
2 XxxYyyyyyZzz 0x0000000100f24958 -[APMSqliteStore recordsForQuery:parameterValues:error:withFilter:] + 548
3 XxxYyyyyyZzz 0x0000000100f24704 -[APMSqliteStore recordsForQuery:parameterValues:error:] + 76
4 XxxYyyyyyZzz 0x0000000100ea3854 -[APMDatabase dataTypesFromTableWithName:columnName:columnValue:error:createDataTypeBlock:] + 384
5 XxxYyyyyyZzz 0x0000000100e985b8 -[APMDatabase dailyCounts:] + 224
6 XxxYyyyyyZzz 0x0000000100ed604c __57-[APMMeasurement(Event) writeFilteredEventOnWorkerQueue:]_block_invoke + 160
7 XxxYyyyyyZzz 0x0000000100f24dd8 -[APMSqliteStore performTransactionWithError:block:] + 176
8 XxxYyyyyyZzz 0x0000000100e97d38 -[APMDatabase performTransaction:] + 48
9 XxxYyyyyyZzz 0x0000000100ed5f80 -[APMMeasurement(Event) writeFilteredEventOnWorkerQueue:] + 264
10 XxxYyyyyyZzz 0x0000000100ed5bc4 -[APMMeasurement(Event) writeEventOnWorkerQueue:] + 1444
11 XxxYyyyyyZzz 0x0000000100ed54b0 -[APMMeasurement(Event) handleEventOnWorkerQueue:] + 540
12 XxxYyyyyyZzz 0x0000000100ecb684 -[APMMeasurement logEventOnWorkerQueue:notifyEventListeners:] + 76
13 XxxYyyyyyZzz 0x0000000100ecb634 -[APMMeasurement logEventOnWorkerQueueWithOrigin:isPublicEvent:name:parameters:timestamp:enabled:ignoreEnabled:ignoreInterceptor:interceptor:addedScreenParameters:] + 708
14 XxxYyyyyyZzz 0x0000000100ecb2c8 __151-[APMMeasurement logEventWithOrigin:isPublicEvent:name:parameters:timestamp:enabled:ignoreEnabled:ignoreInterceptor:interceptor:addedScreenParameters:]_block_invoke + 68
15 XxxYyyyyyZzz 0x0000000100f1a4b0 __51-[APMScheduler scheduleOnWorkerQueueBlockID:block:]_block_invoke + 44
16 libdispatch.dylib 0x00000001b6eee320 _dispatch_call_block_and_release + 32 (init.c:1518)
17 libdispatch.dylib 0x00000001b6eefeac _dispatch_client_callout + 20 (object.m:560)
18 libdispatch.dylib 0x00000001b6ef7534 _dispatch_lane_serial_drain + 668 (queue.c:3885)
19 libdispatch.dylib 0x00000001b6ef80a4 _dispatch_lane_invoke + 384 (queue.c:3976)
20 libdispatch.dylib 0x00000001b6f02cdc _dispatch_workloop_worker_thread + 648 (queue.c:6507)
21 libsystem_pthread.dylib 0x000000020f859ddc _pthread_wqthread + 288 (pthread.c:2618)
22 libsystem_pthread.dylib 0x000000020f859b7c start_wqthread + 8 (:-1)
Thread 4:
0 libsystem_pthread.dylib 0x000000020f859b74 start_wqthread + 0 (:-1)
Thread 5:
0 libsystem_pthread.dylib 0x000000020f859b74 start_wqthread + 0 (:-1)
Thread 6 name:
Thread 6:
0 libsystem_kernel.dylib 0x00000001ee9deca4 mach_msg2_trap + 8 (:-1)
1 libsystem_kernel.dylib 0x00000001ee9f1b74 mach_msg2_internal + 80 (mach_msg.c:201)
2 libsystem_kernel.dylib 0x00000001ee9f1e4c mach_msg_overwrite + 540 (mach_msg.c:0)
3 libsystem_kernel.dylib 0x00000001ee9df1e8 mach_msg + 24 (mach_msg.c:323)
4 CoreFoundation 0x00000001afa98024 __CFRunLoopServiceMachPort + 160 (CFRunLoop.c:2622)
5 CoreFoundation 0x00000001afa99250 __CFRunLoopRun + 1208 (CFRunLoop.c:3005)
6 CoreFoundation 0x00000001afa9e3ec CFRunLoopRunSpecific + 612 (CFRunLoop.c:3418)
7 Foundation 0x00000001a9d12fb4 -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 212 (NSRunLoop.m:373)
8 Foundation 0x00000001a9d12e9c -[NSRunLoop(NSRunLoop) runUntilDate:] + 64 (NSRunLoop.m:420)
9 UIKitCore 0x00000001b1f5dcc8 -[UIEventFetcher threadMain] + 416 (UIEventFetcher.m:1376)
10 Foundation 0x00000001a9d2c524 __NSThread__start__ + 716 (NSThread.m:963)
11 libsystem_pthread.dylib 0x000000020f85a6b8 _pthread_start + 148 (pthread.c:893)
12 libsystem_pthread.dylib 0x000000020f859b88 thread_start + 8 (:-1)
Thread 7 name:
Thread 7:
0 libsystem_kernel.dylib 0x00000001ee9df7dc __ulock_wait + 8 (:-1)
1 libdispatch.dylib 0x00000001b6ef089c _dlock_wait + 56 (lock.c:326)
2 libdispatch.dylib 0x00000001b6ef0650 _dispatch_thread_event_wait_slow + 56 (lock.c:558)
3 libdispatch.dylib 0x00000001b6eff714 __DISPATCH_WAIT_FOR_QUEUE__ + 368 (queue.c:1683)
4 libdispatch.dylib 0x00000001b6eff2c0 _dispatch_sync_f_slow + 148 (queue.c:1769)
5 libsystem_trace.dylib 0x00000001c6c500a8 ___os_state_request_for_self_block_invoke + 372 (state.c:313)
6 libdispatch.dylib 0x00000001b6eee320 _dispatch_call_block_and_release + 32 (init.c:1518)
7 libdispatch.dylib 0x00000001b6eefeac _dispatch_client_callout + 20 (object.m:560)
8 libdispatch.dylib 0x00000001b6ef7534 _dispatch_lane_serial_drain + 668 (queue.c:3885)
9 libdispatch.dylib 0x00000001b6ef80d8 _dispatch_lane_invoke + 436 (queue.c:3976)
10 libdispatch.dylib 0x00000001b6f02cdc _dispatch_workloop_worker_thread + 648 (queue.c:6507)
11 libsystem_pthread.dylib 0x000000020f859ddc _pthread_wqthread + 288 (pthread.c:2618)
12 libsystem_pthread.dylib 0x000000020f859b7c start_wqthread + 8 (:-1)
Thread 8:
0 libsystem_pthread.dylib 0x000000020f859b74 start_wqthread + 0 (:-1)
Thread 9 name:
Thread 9:
0 libobjc.A.dylib 0x00000001a8aaaedc objc_retainAutoreleasedReturnValue + 136 (NSObject.mm:2262)
1 XxxYyyyyyZzz 0x0000000100eba454 __32-[APMIdentity updateIdentifiers]_block_invoke + 196
2 libdispatch.dylib 0x00000001b6eee320 _dispatch_call_block_and_release + 32 (init.c:1518)
3 libdispatch.dylib 0x00000001b6eefeac _dispatch_client_callout + 20 (object.m:560)
4 libdispatch.dylib 0x00000001b6ef7534 _dispatch_lane_serial_drain + 668 (queue.c:3885)
5 libdispatch.dylib 0x00000001b6ef80a4 _dispatch_lane_invoke + 384 (queue.c:3976)
6 libdispatch.dylib 0x00000001b6f02cdc _dispatch_workloop_worker_thread + 648 (queue.c:6507)
7 libsystem_pthread.dylib 0x000000020f859ddc _pthread_wqthread + 288 (pthread.c:2618)
8 libsystem_pthread.dylib 0x000000020f859b7c start_wqthread + 8 (:-1)
Thread 10 name:
Thread 10:
0 libsystem_kernel.dylib 0x00000001ee9deca4 mach_msg2_trap + 8 (:-1)
1 libsystem_kernel.dylib 0x00000001ee9f1b74 mach_msg2_internal + 80 (mach_msg.c:201)
2 libsystem_kernel.dylib 0x00000001ee9f1e4c mach_msg_overwrite + 540 (mach_msg.c:0)
3 libsystem_kernel.dylib 0x00000001ee9df1e8 mach_msg + 24 (mach_msg.c:323)
4 FirebaseCrashlytics 0x000000010124acd4 FIRCLSMachExceptionReadMessage + 60 (FIRCLSMachException.c:192)
5 FirebaseCrashlytics 0x000000010124acd4 FIRCLSMachExceptionServer + 108 (FIRCLSMachException.c:168)
6 libsystem_pthread.dylib 0x000000020f85a6b8 _pthread_start + 148 (pthread.c:893)
7 libsystem_pthread.dylib 0x000000020f859b88 thread_start + 8 (:-1)
Thread 11:
0 libsystem_pthread.dylib 0x000000020f859b74 start_wqthread + 0 (:-1)
Thread 0 crashed with ARM Thread State (64-bit):
x0: 0x0000000000000000 x1: 0x0000000000000000 x2: 0x0000000000000000 x3: 0x0000000000000000
x4: 0x0000000000000000 x5: 0x0000000000989680 x6: 0x000000000000006e x7: 0x0000000000000700
x8: 0xc0da63ef9e85c442 x9: 0xc0da63ed98b90d02 x10: 0x00000000000003e8 x11: 0x000000000000000b
x12: 0x000000000000000b x13: 0x00000000001ff800 x14: 0x00000000000007fb x15: 0x00000000a900b012
x16: 0x0000000000000148 x17: 0x00000002063cc940 x18: 0x0000000000000000 x19: 0x0000000000000006
x20: 0x0000000000000103 x21: 0x00000002063cca20 x22: 0x0000000000000007 x23: 0x0000000101267701
x24: 0x0000000000000000 x25: 0x0000000000000001 x26: 0x0000000000000001 x27: 0x0000000000000000
x28: 0x00000001d1b386c0 fp: 0x000000016f14f3f0 lr: 0x000000020f860118
sp: 0x000000016f14f3d0 pc: 0x00000001ee9e5578 cpsr: 0x40001000
esr: 0x56000080 Address size fault
Binary Images:
0x100cb0000 - 0x100ffffff XxxYyyyyyZzz arm64 <56e8b0740be232df91fd8a9f0a65540b> /private/var/containers/Bundle/Application/62F17CD5-0791-4527-88BC-3F4B2CD1C3F6/XxxYyyyyyZzz.app/XxxYyyyyyZzz
0x101198000 - 0x1011a7fff FBLPromises arm64 /private/var/containers/Bundle/Application/62F17CD5-0791-4527-88BC-3F4B2CD1C3F6/XxxYyyyyyZzz.app/Frameworks/FBLPromises.framework/FBLPromises
0x1011c8000 - 0x1011d3fff FirebaseABTesting arm64 <22b814b35ce1300cb7924bcb0257525f> /private/var/containers/Bundle/Application/62F17CD5-0791-4527-88BC-3F4B2CD1C3F6/XxxYyyyyyZzz.app/Frameworks/FirebaseABTesting.framework/FirebaseABTesting
0x1011e8000 - 0x1011f7fff FirebaseCore arm64 <27c0924879b9372896407106b7661dfe> /private/var/containers/Bundle/Application/62F17CD5-0791-4527-88BC-3F4B2CD1C3F6/XxxYyyyyyZzz.app/Frameworks/FirebaseCore.framework/FirebaseCore
0x10121c000 - 0x101223fff FirebaseCoreDiagnostics arm64 <940bdf1bfd6036d9af781d0875611e2a> /private/var/containers/Bundle/Application/62F17CD5-0791-4527-88BC-3F4B2CD1C3F6/XxxYyyyyyZzz.app/Frameworks/FirebaseCoreDiagnostics.framework/FirebaseCoreDiagnostics
0x101234000 - 0x101273fff FirebaseCrashlytics arm64 <079843ad6d4834adaeb79557253e958d> /private/var/containers/Bundle/Application/62F17CD5-0791-4527-88BC-3F4B2CD1C3F6/XxxYyyyyyZzz.app/Frameworks/FirebaseCrashlytics.framework/FirebaseCrashlytics
0x1012f0000 - 0x101307fff FirebaseInstallations arm64 <3b48221eb8ef3e02ac381566a7a2163e> /private/var/containers/Bundle/Application/62F17CD5-0791-4527-88BC-3F4B2CD1C3F6/XxxYyyyyyZzz.app/Frameworks/FirebaseInstallations.framework/FirebaseInstallations
0x10133c000 - 0x10134bfff GoogleToolboxForMac arm64 <7343759df29f3b379321d7773f0f6d88> /private/var/containers/Bundle/Application/62F17CD5-0791-4527-88BC-3F4B2CD1C3F6/XxxYyyyyyZzz.app/Frameworks/GoogleToolboxForMac.framework/GoogleToolboxForMac
0x10140c000 - 0x10142bfff FirebaseRemoteConfig arm64 /private/var/containers/Bundle/Application/62F17CD5-0791-4527-88BC-3F4B2CD1C3F6/XxxYyyyyyZzz.app/Frameworks/FirebaseRemoteConfig.framework/FirebaseRemoteConfig
0x101460000 - 0x10147ffff GoogleDataTransport arm64 <290bf8156c603885a987424119ab4c30> /private/var/containers/Bundle/Application/62F17CD5-0791-4527-88BC-3F4B2CD1C3F6/XxxYyyyyyZzz.app/Frameworks/GoogleDataTransport.framework/GoogleDataTransport
0x1014bc000 - 0x1014d7fff GoogleUtilities arm64 /private/var/containers/Bundle/Application/62F17CD5-0791-4527-88BC-3F4B2CD1C3F6/XxxYyyyyyZzz.app/Frameworks/GoogleUtilities.framework/GoogleUtilities
0x10150c000 - 0x1015a3fff Lottie arm64 <0ab516b8c66439579884e8b2c7b2d1ef> /private/var/containers/Bundle/Application/62F17CD5-0791-4527-88BC-3F4B2CD1C3F6/XxxYyyyyyZzz.app/Frameworks/Lottie.framework/Lottie
0x101778000 - 0x101787fff MBProgressHUD arm64 <76404a377d913266851ae6dd498583a2> /private/var/containers/Bundle/Application/62F17CD5-0791-4527-88BC-3F4B2CD1C3F6/XxxYyyyyyZzz.app/Frameworks/MBProgressHUD.framework/MBProgressHUD
0x1017a4000 - 0x1017affff OrderedDictionary arm64 <351d0be87f713d55898810f07fb11fe9> /private/var/containers/Bundle/Application/62F17CD5-0791-4527-88BC-3F4B2CD1C3F6/XxxYyyyyyZzz.app/Frameworks/OrderedDictionary.framework/OrderedDictionary
0x1017c4000 - 0x1017cbfff Reachability arm64 <2b67fb47ef10384b8d75b27409dd830c> /private/var/containers/Bundle/Application/62F17CD5-0791-4527-88BC-3F4B2CD1C3F6/XxxYyyyyyZzz.app/Frameworks/Reachability.framework/Reachability
0x1017dc000 - 0x101803fff TrustKit arm64 <370fc832c9fa3d2d9c64a88eb5b740f7> /private/var/containers/Bundle/Application/62F17CD5-0791-4527-88BC-3F4B2CD1C3F6/XxxYyyyyyZzz.app/Frameworks/TrustKit.framework/TrustKit
0x10182c000 - 0x101833fff nanopb arm64 <4c9dd759e86e37b18eeb1d645615bf09> /private/var/containers/Bundle/Application/62F17CD5-0791-4527-88BC-3F4B2CD1C3F6/XxxYyyyyyZzz.app/Frameworks/nanopb.framework/nanopb
0x101840000 - 0x10187ffff Services arm64 /private/var/containers/Bundle/Application/62F17CD5-0791-4527-88BC-3F4B2CD1C3F6/XxxYyyyyyZzz.app/Frameworks/Services.framework/Services
0x1018b4000 - 0x1018c7fff Logging arm64 <69d81dde266f38dcae332043c4a21b49> /private/var/containers/Bundle/Application/62F17CD5-0791-4527-88BC-3F4B2CD1C3F6/XxxYyyyyyZzz.app/Frameworks/Logging.framework/Logging
0x1018dc000 - 0x101937fff Cccccc arm64 <8a26dfee26cb3119ab2c09a50eb46454> /private/var/containers/Bundle/Application/62F17CD5-0791-4527-88BC-3F4B2CD1C3F6/XxxYyyyyyZzz.app/Frameworks/Cccccc.framework/Cccccc
0x101978000 - 0x10197ffff Localized arm64 /private/var/containers/Bundle/Application/62F17CD5-0791-4527-88BC-3F4B2CD1C3F6/XxxYyyyyyZzz.app/Frameworks/Localized.framework/Localized
0x101990000 - 0x1019a3fff Utility arm64 <43c437e69ce03cdba9d33a839e472552> /private/var/containers/Bundle/Application/62F17CD5-0791-4527-88BC-3F4B2CD1C3F6/XxxYyyyyyZzz.app/Frameworks/Utility.framework/Utility
0x1019bc000 - 0x1019f7fff Models arm64 /private/var/containers/Bundle/Application/62F17CD5-0791-4527-88BC-3F4B2CD1C3F6/XxxYyyyyyZzz.app/Frameworks/Models.framework/Models
0x101a30000 - 0x101a53fff Analytics arm64 /private/var/containers/Bundle/Application/62F17CD5-0791-4527-88BC-3F4B2CD1C3F6/XxxYyyyyyZzz.app/Frameworks/Analytics.framework/Analytics
0x10382c000 - 0x103837fff libobjc-trampolines.dylib arm64e <7e77fc541c3331c086e81fb7bf12836c> /private/preboot/Cryptexes/OS/usr/lib/libobjc-trampolines.dylib
0x1a8aa4000 - 0x1a8ae7f9f libobjc.A.dylib arm64e /usr/lib/libobjc.A.dylib
0x1a9cd1000 - 0x1aa5aefff Foundation arm64e <1715de5d08933af0b0c0550bb14f91ec> /System/Library/Frameworks/Foundation.framework/Foundation
0x1afa1f000 - 0x1afe06fff CoreFoundation arm64e /System/Library/Frameworks/CoreFoundation.framework/CoreFoundation
0x1b1a8e000 - 0x1b32b2fff UIKitCore arm64e <7d57a1d1856f338d97db880c4ec8b02e> /System/Library/PrivateFrameworks/UIKitCore.framework/UIKitCore
0x1b6eec000 - 0x1b6f32fff libdispatch.dylib arm64e <5d16936b4e4c3276ba7a69c9bc760aba> /usr/lib/system/libdispatch.dylib
0x1b6f33000 - 0x1b6fb0ff3 libsystem_c.dylib arm64e <073251d1d4c937748cee75210751a5d8> /usr/lib/system/libsystem_c.dylib
0x1c6c46000 - 0x1c6c60fff libsystem_trace.dylib arm64e <5db7e298f0e33a1088723ab0fb861240> /usr/lib/system/libsystem_trace.dylib
0x1cefbb000 - 0x1cf040a53 dyld arm64e /usr/lib/dyld
0x1eafb3000 - 0x1eafbbfff GraphicsServices arm64e /System/Library/PrivateFrameworks/GraphicsServices.framework/GraphicsServices
0x1ee9de000 - 0x1eea15fe7 libsystem_kernel.dylib arm64e <681b06a07f6b3fa3a2ce063dc1da7b1b> /usr/lib/system/libsystem_kernel.dylib
0x20f78d000 - 0x20f7a4fff libc++abi.dylib arm64e <1e834588aca6327a9a965aa8b13a2ae2> /usr/lib/libc++abi.dylib
0x20f859000 - 0x20f864ff3 libsystem_pthread.dylib arm64e /usr/lib/system/libsystem_pthread.dylib
EOF
Whenever we present one of these view controllers, things work just fine. When we try to present another one though, if someone is aggressively changing the phone orientation, the app crashes. This crash occurs somewhere in between dismissing the old VC and presenting the new one. It occurs before I ever hit any breakpoints in the "present" animator for the second view controller.
I've narrowed things down a bit, and by commenting out our implementation of adaptivePresentationStyle(for:traitCollection:), the crash can't be reproduced anymore. The downside there being that the app no longer functions how we want it to. Our definition of that function (which causes crashes) looks like this:
public func adaptivePresentationStyle(for controller: UIPresentationController, traitCollection: UITraitCollection) -> UIModalPresentationStyle {
guard forceUsingFullScreenIfCompact else {
return .none
}
return traitCollection.verticalSizeClass == .compact ? .overFullScreen : .none
}
A bit more testing, and it seems like if that function returns the same thing consistently, nothing crashes. Are we not allowed to put conditional logic in this function?
In the crash, we can see that it occurs due to a failing assertion internal to UIPresentationController:
Last Exception Backtrace:
0 CoreFoundation 0x1afa28cb4 __exceptionPreprocess + 164 (NSException.m:202)
1 libobjc.A.dylib 0x1a8abc3d0 objc_exception_throw + 60 (objc-exception.mm:356)
2 Foundation 0x1aa1b2688 -[NSAssertionHandler handleFailureInFunction:file:lineNumber:description:] + 172 (NSException.m:251)
3 UIKitCore 0x1b1d05610 __80-[UIPresentationController _initViewHierarchyForPresentationSuperview:inWindow:]_block_invoke + 2588 (UIPresentationController.m:1594)
4 UIKitCore 0x1b21f1ff4 __56-[UIPresentationController runTransitionForCurrentState]_block_invoke_3 + 300 (UIPresentationController.m:1228)
This all leads us to wonder if we're doing something wrong, or if there could be a bug in one of the iOS APIs that we're consuming. Thus, posting here. Does anyone have any insight into how this could be occurring, or has seen this before and has ideas? Thanks!
We target iOS 14+ We've seen this issue in debug and release builds from Xcode 14 and 15 We see the issue on users with iOS 15+, though it could be occurring on 14 in just incredibly low numbers This is a re-post of https://developer.apple.com/forums/thread/738257 , because I accidentally closed that out as resolved
