我正在使用Xamarin.IOS进行开发。 我从用户那里收到了很多这样的崩溃报告。
崩溃报告如下所示：
Incident Identifier: 21D06ED3-DE8E-4872-B75F-19D5B350E406
CrashReporter Key: 07432D3F-8FFD-427B-A2C6-6B6E77AF5223
Hardware Model: iPhone7,2
Process: ****
Path: ****
Identifier: ****
Version: ****
Code Type: ARM-64
Parent Process: ??? [1]
Date/Time: 2017-02-08T14:54:58Z
Launch Time: 2017-02-08T14:54:50Z
OS Version: iPhone OS 10.2.1 (14D27)
Report Version: 104
Exception Type: SIGABRT
Exception Codes: #0 at 0x18d3d7014
Crashed Thread: 13
Application Specific Information:
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'accessing _cachedSystemAnimationFence requires the main thread'
Last Exception Backtrace:
0 CoreFoundation 0x000000018e4091b8 0x18e2d9000 + 1245624
1 libobjc.A.dylib 0x000000018ce4055c 0x18ce38000 + 34140
2 CoreFoundation 0x000000018e40908c 0x18e2d9000 + 1245324
3 Foundation 0x000000018eec102c 0x18ee13000 + 712748
4 UIKit 0x000000019453f690 0x1942af000 + 2688656
5 UIKit 0x0000000194596d70 0x1942af000 + 3046768
6 UIKit 0x0000000194379e7c 0x1942af000 + 831100
7 UIKit 0x00000001942c5448 0x1942af000 + 91208
8 UIKit 0x0000000194334308 0x1942af000 + 545544
9 UIKit 0x00000001943ba318 0x1942af000 + 1094424
10 UIKit 0x0000000194629488 0x1942af000 + 3646600
11 UIKit 0x00000001a25d47e0 0x1a2584000 + 329696
12 UIKit 0x000000019462adec 0x1942af000 + 3653100
13 UIKit 0x000000019462d62c 0x1942af000 + 3663404
14 UIKit 0x00000001942cc7dc 0x1942af000 + 120796
15 UIKit 0x000000019462d59c 0x1942af000 + 3663260
16 UIKit 0x000000019462d920 0x1942af000 + 3664160
17 UIKit 0x00000001943b1154 0x1942af000 + 1057108
18 UIKit 0x00000001a25d40dc 0x1a2584000 + 327900
...
Thread 13 Crashed:
0 libsystem_kernel.dylib 0x000000018d3d7014 0x18d3b8000 + 126996
1 libsystem_c.dylib 0x000000018d34b400 0x18d2e8000 + 406528
2 GIVCONVEYiOS 0x000000010019fd90 0x1000f8000 + 687504
3 GIVCONVEYiOS 0x000000010010606c 0x1000f8000 + 57452
4 CoreFoundation 0x000000018e409538 0x18e2d9000 + 1246520
5 libobjc.A.dylib 0x000000018ce40838 0x18ce38000 + 34872
6 GIVCONVEYiOS 0x000000010018dadc 0x1000f8000 + 613084
7 libc++abi.dylib 0x000000018ce2f66c 0x18ce14000 + 112236
8 libc++abi.dylib 0x000000018ce2ef84 0x18ce14000 + 110468
9 libobjc.A.dylib 0x000000018ce40690 0x18ce38000 + 34448
10 CoreFoundation 0x000000018e40908c 0x18e2d9000 + 1245324
11 Foundation 0x000000018eec102c 0x18ee13000 + 712748
12 UIKit 0x000000019453f690 0x1942af000 + 2688656
13 UIKit 0x0000000194596d70 0x1942af000 + 3046768
14 UIKit 0x0000000194379e7c 0x1942af000 + 831100
15 UIKit 0x00000001942c5448 0x1942af000 + 91208
16 UIKit 0x0000000194334308 0x1942af000 + 545544
17 UIKit 0x00000001943ba318 0x1942af000 + 1094424
18 UIKit 0x0000000194629488 0x1942af000 + 3646600
19 UIKit 0x00000001a25d47e0 0x1a2584000 + 329696
20 UIKit 0x000000019462adec 0x1942af000 + 3653100
21 UIKit 0x000000019462d62c 0x1942af000 + 3663404
22 UIKit 0x00000001942cc7dc 0x1942af000 + 120796
23 UIKit 0x000000019462d59c 0x1942af000 + 3663260
24 UIKit 0x000000019462d920 0x1942af000 + 3664160
...
由于它没有呈现堆栈跟踪，因此很难缩小可疑代码区域。从错误消息中，它表明线程13崩溃，因为它更新了UI。
我知道线程13是后台线程。 问：我如何缩小这个问题？或者，我们是否可以通过在每次更新UI之前检测它是否在Mainthread上来追踪此问题？
我试图象征并获得更多信息。
尝试Symbolicate并获取更多信息。线程15崩溃：
0 libsystem_kernel.dylib 0x0000000187543014 __pthread_kill + 8
1 libsystem_c.dylib 0x00000001874b7400 abort + 140
2 GIVCONVEYiOS 0x000000010013bd90 0x100094000 + 687504
3 GIVCONVEYiOS 0x00000001000a206c 0x100094000 + 57452
4 CoreFoundation 0x0000000188575538 __handleUncaughtException + 644
5 libobjc.A.dylib 0x0000000186fac838 _objc_terminate() + 112
6 GIVCONVEYiOS 0x0000000100129adc 0x100094000 + 613084
7 libc++abi.dylib 0x0000000186f9b66c std::__terminate(void (*)()) + 16
8 libc++abi.dylib 0x0000000186f9af84 __cxxabiv1::exception_cleanup_func(_Unwind_Reason_Code, _Unwind_Exception*) + 0
9 libobjc.A.dylib 0x0000000186fac690 _objc_exception_destructor(void*) + 0
10 CoreFoundation 0x000000018857508c +[NSException raise:format:arguments:] + 104
11 Foundation 0x000000018902d02c -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] + 112
12 UIKit 0x000000018e6ab690 -[UIApplication _cachedSystemAnimationFenceCreatingIfNecessary:] + 196
13 UIKit 0x000000018e702d70 +[UIWindow _synchronizeDrawingWithPreCommitHandler:] + 68
14 UIKit 0x000000018e4e5e7c -[UIApplication _setStatusBarHidden:animationParameters:changeApplicationFlag:] + 700
15 UIKit 0x000000018e431448 -[UIApplication _updateCurrentStatusBarViewControllerAppearance] + 436
16 UIKit 0x000000018e4a0308 -[UIViewController setNeedsStatusBarAppearanceUpdate] + 204
17 UIKit 0x000000018e526318 -[UIViewController _setPresentedStatusBarViewController:] + 96
18 UIKit 0x000000018e795488 -[UIViewController _presentViewController:modalSourceViewController:presentationController:animationController:interactionController:completion:] + 1512
19 UIKit 0x000000019c7407e0 -[UIViewControllerAccessibility _presentViewController:modalSourceViewController:presentationController:animationController:interactionController:completion:] + 256
20 UIKit 0x000000018e796dec -[UIViewController _presentViewController:withAnimationController:completion:] + 4524
21 UIKit 0x000000018e79962c __62-[UIViewController presentViewController:animated:completion:]_block_invoke_2 + 68
22 UIKit 0x000000018e4387dc +[UIView(Animation) performWithoutAnimation:] + 104
23 UIKit 0x000000018e79959c __62-[UIViewController presentViewController:animated:completion:]_block_invoke + 312
24 UIKit 0x000000018e799920 -[UIViewController _performCoordinatedPresentOrDismiss:animated:] + 524
25 UIKit 0x000000018e51d154 -[UIViewController presentViewController:animated:completion:] + 184
26 UIKit 0x000000019c7400dc -[UIViewControllerAccessibility presentViewController:animated:completion:] + 204
27 GIVCONVEYiOS 0x00000001003a59b0 0x100094000 + 3217840
28 GIVCONVEYiOS 0x0000000100341b08 0x100094000 + 2808584
29 GIVCONVEYiOS 0x0000000100fce0a0 0x100094000 + 15966368
30 GIVCONVEYiOS 0x0000000100fceee4 0x100094000 + 15970020
31 GIVCONVEYiOS 0x0000000100fd48dc 0x100094000 + 15993052
如何使用以下信息行找到代码：27 GIVCONVEYiOS 0x00000001003a59b0 0x100094000 + 3217840