我开发的应用程序使用外部附件，应用程序在某些时候崩溃。最难调试的是崩溃的应用程序，设备无法连接到Xcode。
我得到的崩溃日志没有象征，我没有成功地使它更清晰。
任何人都可以通过附加的崩溃日志来解释我的代码有什么问题。
Incident Identifier: 9BB6134A-68AF-4D88-9DF4-E1AB5F00F429
CrashReporter Key: 7c5ffd5961e66395d76785cd412baf0761515cbb
Hardware Model: iPad5,4
Process: reFlash [666]
Path: /private/var/containers/Bundle/Application/4E98396D-5D6B-4FF1-8992-389A73E4A17D/reFlash.app/reFlash
Identifier: com.softescu.reflash
Version: 1 (1.06)
Code Type: ARM-64 (Native)
Role: Foreground
Parent Process: launchd [1]
Coalition: com.softescu.reflash [663]
Date/Time: 2017-05-17 17:06:26.2257 +0300
Launch Time: 2017-05-17 17:05:51.8520 +0300
OS Version: iPhone OS 10.2.1 (14D27)
Report Version: 104
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Triggered by Thread: 3
Application Specific Information:
abort() called
Filtered syslog:
None found
Last Exception Backtrace:
0 CoreFoundation 0x18a2451b8 __exceptionPreprocess + 124
1 libobjc.A.dylib 0x188c7c55c objc_exception_throw + 56
2 CoreFoundation 0x18a245100 +[NSException raise:format:] + 116
3 CoreFoundation 0x18a13fd90 -[__NSCFString substringWithRange:] + 168
4 reFlash 0x1000a3d10 0x10006c000 + 228624
5 reFlash 0x1000a3224 0x10006c000 + 225828
6 reFlash 0x100085448 0x10006c000 + 103496
7 reFlash 0x10008914c 0x10006c000 + 119116
8 reFlash 0x1000cc41c 0x10006c000 + 394268
9 reFlash 0x1000cb704 0x10006c000 + 390916
10 ExternalAccessory 0x1979f5ff8 -[EAInputStream _streamEventTrigger] + 504
11 CoreFoundation 0x18a1f2b5c __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24
12 CoreFoundation 0x18a1f24a4 __CFRunLoopDoSources0 + 524
13 CoreFoundation 0x18a1f00a4 __CFRunLoopRun + 804
14 CoreFoundation 0x18a11e2b8 CFRunLoopRunSpecific + 444
15 Foundation 0x18ac5b26c -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 304
16 Foundation 0x18acafaa0 -[NSRunLoop(NSRunLoop) run] + 88
17 reFlash 0x100088d88 0x10006c000 + 118152
18 Foundation 0x18ad58e68 __NSThread__start__ + 1024
19 libsystem_pthread.dylib 0x1892d9850 _pthread_body + 240
20 libsystem_pthread.dylib 0x1892d9760 _pthread_start + 284
21 libsystem_pthread.dylib 0x1892d6d94 thread_start + 4
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0:
0 libsystem_kernel.dylib 0x00000001891f5188 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x00000001891f4ff8 mach_msg + 72
2 CoreFoundation 0x000000018a1f25d0 __CFRunLoopServiceMachPort + 192
3 CoreFoundation 0x000000018a1f01ec __CFRunLoopRun + 1132
4 CoreFoundation 0x000000018a11e2b8 CFRunLoopRunSpecific + 444
5 GraphicsServices 0x000000018bbd2198 GSEventRunModal + 180
6 UIKit 0x000000019015e7fc -[UIApplication _run] + 684
7 UIKit 0x0000000190159534 UIApplicationMain + 208
8 reFlash 0x000000010009f4c8 0x10006c000 + 210120
9 libdyld.dylib 0x00000001891015b8 start + 4
Thread 1 name: com.apple.uikit.eventfetch-thread
Thread 1:
0 libsystem_kernel.dylib 0x00000001891f5188 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x00000001891f4ff8 mach_msg + 72
2 CoreFoundation 0x000000018a1f25d0 __CFRunLoopServiceMachPort + 192
3 CoreFoundation 0x000000018a1f01ec __CFRunLoopRun + 1132
4 CoreFoundation 0x000000018a11e2b8 CFRunLoopRunSpecific + 444
5 Foundation 0x000000018ac5b26c -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 304
6 Foundation 0x000000018ac7bdd0 -[NSRunLoop(NSRunLoop) runUntilDate:] + 96
7 UIKit 0x0000000190ad2c38 -[UIEventFetcher threadMain] + 136
8 Foundation 0x000000018ad58e68 __NSThread__start__ + 1024
9 libsystem_pthread.dylib 0x00000001892d9850 _pthread_body + 240
10 libsystem_pthread.dylib 0x00000001892d9760 _pthread_body + 0
11 libsystem_pthread.dylib 0x00000001892d6d94 thread_start + 4
Thread 2 name: GAIThread
Thread 2:
0 libsystem_kernel.dylib 0x00000001891f5188 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x00000001891f4ff8 mach_msg + 72
2 CoreFoundation 0x000000018a1f25d0 __CFRunLoopServiceMachPort + 192
3 CoreFoundation 0x000000018a1f01ec __CFRunLoopRun + 1132
4 CoreFoundation 0x000000018a11e2b8 CFRunLoopRunSpecific + 444
5 Foundation 0x000000018ac5b26c -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 304
6 Foundation 0x000000018acafaa0 -[NSRunLoop(NSRunLoop) run] + 88
7 reFlash 0x00000001000afe0c 0x10006c000 + 278028
8 Foundation 0x000000018ad58e68 __NSThread__start__ + 1024
9 libsystem_pthread.dylib 0x00000001892d9850 _pthread_body + 240
10 libsystem_pthread.dylib 0x00000001892d9760 _pthread_body + 0
11 libsystem_pthread.dylib 0x00000001892d6d94 thread_start + 4
Thread 3 Crashed:
0 libsystem_kernel.dylib 0x0000000189213014 __pthread_kill + 8
1 libsystem_pthread.dylib 0x00000001892db450 pthread_kill + 112
2 libsystem_c.dylib 0x0000000189187400 abort + 140
3 libc++abi.dylib 0x0000000188c512d4 __cxa_bad_cast + 0
4 libc++abi.dylib 0x0000000188c6b688 std::__terminate(void (*)()) + 44
5 libc++abi.dylib 0x0000000188c6b234 __cxa_rethrow + 144
6 libobjc.A.dylib 0x0000000188c7c71c objc_exception_rethrow + 44
7 CoreFoundation 0x000000018a11e32c CFRunLoopRunSpecific + 560
8 Foundation 0x000000018ac5b26c -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 304
9 Foundation 0x000000018acafaa0 -[NSRunLoop(NSRunLoop) run] + 88
10 reFlash 0x0000000100088d88 0x10006c000 + 118152
11 Foundation 0x000000018ad58e68 __NSThread__start__ + 1024
12 libsystem_pthread.dylib 0x00000001892d9850 _pthread_body + 240
13 libsystem_pthread.dylib 0x00000001892d9760 _pthread_body + 0
14 libsystem_pthread.dylib 0x00000001892d6d94 thread_start + 4
Thread 4 name: com.apple.CFSocket.private
Thread 4:
0 libsystem_kernel.dylib 0x000000018921323c __select + 8
1 CoreFoundation 0x000000018a1f9468 __CFSocketManager + 640
2 libsystem_pthread.dylib 0x00000001892d9850 _pthread_body + 240
3 libsystem_pthread.dylib 0x00000001892d9760 _pthread_body + 0
4 libsystem_pthread.dylib 0x00000001892d6d94 thread_start + 4
Thread 5 name: com.apple.NSURLConnectionLoader
Thread 5:
0 libsystem_kernel.dylib 0x00000001891f5188 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x00000001891f4ff8 mach_msg + 72
2 CoreFoundation 0x000000018a1f25d0 __CFRunLoopServiceMachPort + 192
3 CoreFoundation 0x000000018a1f01ec __CFRunLoopRun + 1132
4 CoreFoundation 0x000000018a11e2b8 CFRunLoopRunSpecific + 444
5 CFNetwork 0x000000018a923a70 +[NSURLConnection(Loader) _resourceLoadLoop:] + 336
6 Foundation 0x000000018ad58e68 __NSThread__start__ + 1024
7 libsystem_pthread.dylib 0x00000001892d9850 _pthread_body + 240
8 libsystem_pthread.dylib 0x00000001892d9760 _pthread_body + 0
9 libsystem_pthread.dylib 0x00000001892d6d94 thread_start + 4
Thread 6:
0 libsystem_pthread.dylib 0x00000001892d6d88 start_wqthread + 0
Thread 7:
0 libsystem_pthread.dylib 0x00000001892d6d88 start_wqthread + 0
Thread 8:
0 libsystem_pthread.dylib 0x00000001892d6d88 start_wqthread + 0
Thread 9:
0 libsystem_pthread.dylib 0x00000001892d6d88 start_wqthread + 0
Thread 3 crashed with ARM Thread State (64-bit):
x0: 0x0000000000000000 x1: 0x0000000000000000 x2: 0x0000000000000000 x3: 0x00000001700fb4b1
x4: 0x0000000188c6f963 x5: 0x000000016e292ab0 x6: 0x000000000000006e x7: 0x0000000000000340
x8: 0x0000000008000000 x9: 0x0000000004000000 x10: 0x0000000000000031 x11: 0xffffffffffffffff
x12: 0x000000018919e772 x13: 0x0000000000000000 x14: 0x0000030000000300 x15: 0x0000000000000000
x16: 0x0000000000000148 x17: 0x0000000188c96d54 x18: 0x0000000000000000 x19: 0x0000000000000006
x20: 0x000000016e293000 x21: 0x000000016e292ab0 x22: 0x00000001af2bcbb8 x23: 0x0000000000000001
x24: 0x0000000170018750 x25: 0x0000000000000000 x26: 0x0000000000000001 x27: 0x0000000000000000
x28: 0x0000000000000000 fp: 0x000000016e292a10 lr: 0x00000001892db450
sp: 0x000000016e2929f0 pc: 0x0000000189213014 cpsr: 0x00000000