I am a relatively new developer and would like some assistance. My app does not crash when I have it hooked up via Xcode. However, when I try to run it again the next day (launching from my phone), it crashes when trying to open it. I am currently debugging the situation and am unsure how to proceed.
I'm having troubles with understanding how a device log crashes work. I was able to get to my device's crashes in Xcode via Window>Device and Simulators>View Device Logs>All Logs. I am able to understand that having an Exception type of "EXC_BREAKPOINT (SIGTRAP)" means that I force unwrap a nil value. I am unsure how through looking at the log (or any other method) that I can locate in my code where this is happening. How can I locate in all my files where this is causing a crash?
Date/Time: 2018-04-05 14:33:48.7121 -0500
Launch Time: 2018-04-05 14:33:47.8058 -0500
OS Version: iPhone OS 11.3 (15E216)
Baseband Version: 1.04.16
Report Version: 104
Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000001, 0x0000000104177ff8
Termination Signal: Trace/BPT trap: 5
Termination Reason: Namespace SIGNAL, Code 0x5
Terminating Process: exc handler [0]
Triggered by Thread: 1
Filtered syslog:
None found
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0:
0 libsystem_kernel.dylib 0x0000000180d07e08 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x0000000180d07c80 mach_msg + 72
2 CoreFoundation 0x000000018124ae40 __CFRunLoopServiceMachPort + 196
3 CoreFoundation 0x0000000181248908 __CFRunLoopRun + 1568
4 CoreFoundation 0x0000000181168da8 CFRunLoopRunSpecific + 552
5 GraphicsServices 0x000000018314b020 GSEventRunModal + 100
6 UIKit 0x000000018b14978c UIApplicationMain + 236
7 &me 0x0000000102cd00e4 0x102bac000 + 1196260
8 libdyld.dylib 0x0000000180bf9fc0 start + 4
Thread 1 name: Dispatch queue: NSOperationQueue 0x1d4224f80 (QOS: UNSPECIFIED)
Thread 1 Crashed:
0 libswiftCore.dylib 0x0000000104177ff8 0x103fd0000 + 1736696
1 libswiftCore.dylib 0x0000000104177ff8 0x103fd0000 + 1736696
2 libswiftCore.dylib 0x00000001040182b8 0x103fd0000 + 295608
3 &me 0x0000000102c9576c 0x102bac000 + 956268
4 &me 0x0000000102c95cbc 0x102bac000 + 957628
5 CFNetwork 0x0000000181831c1c __75-[__NSURLSessionLocal taskForClass:request:uploadFile:bodyData:completion:]_block_invoke + 32
6 CFNetwork 0x000000018184a93c __49-[__NSCFLocalSessionTask _task_onqueue_didFinish]_block_invoke + 152
7 Foundation 0x0000000181ccae88 __NSBLOCKOPERATION_IS_CALLING_OUT_TO_A_BLOCK__ + 16
8 Foundation 0x0000000181c0c8d0 -[NSBlockOperation main] + 72
9 Foundation 0x0000000181c0bcac -[__NSOperationInternal _start:] + 848
10 libdispatch.dylib 0x0000000180b94ae4 _dispatch_client_callout + 16
11 libdispatch.dylib 0x0000000180bd0b0c _dispatch_block_invoke_direct$VARIANT$armv81 + 216
12 libdispatch.dylib 0x0000000180b94ae4 _dispatch_client_callout + 16
13 libdispatch.dylib 0x0000000180bd0b0c _dispatch_block_invoke_direct$VARIANT$armv81 + 216
14 libdispatch.dylib 0x0000000180bd0a00 dispatch_block_perform$VARIANT$armv81 + 104
15 Foundation 0x0000000181ccc750 __NSOQSchedule_f + 376
16 libdispatch.dylib 0x0000000180b94ae4 _dispatch_client_callout + 16
17 libdispatch.dylib 0x0000000180bd17a8 _dispatch_continuation_pop$VARIANT$armv81 + 416
18 libdispatch.dylib 0x0000000180bd0180 _dispatch_async_redirect_invoke$VARIANT$armv81 + 596
19 libdispatch.dylib 0x0000000180bd63a4 _dispatch_root_queue_drain + 592
20 libdispatch.dylib 0x0000000180bd60f0 _dispatch_worker_thread3 + 112
21 libsystem_pthread.dylib 0x0000000180ec7fac _pthread_wqthread + 1176
22 libsystem_pthread.dylib 0x0000000180ec7b08 start_wqthread + 4
