开发了一个应用，在调试阶段运行一切正常，但是到了真机就崩溃。
我设法找到了崩溃日志信息，如下：
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Crashed Thread: 0
Last Exception Backtrace:
0 CoreFoundation 0x3238329e __exceptionPreprocess + 158
1 libobjc.A.dylib 0x3a22e97a objc_exception_throw + 26
2 UIKit 0x3451837c +[UIStoryboard storyboardWithName:bundle:] + 436
3 UIKit 0x3435a58e -[UIApplication _loadMainStoryboardFileNamed:bundle:] + 38
4 UIKit 0x341e379c -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 524
5 UIKit 0x3418bc34 -[UIApplication handleEvent:withNewEvent:] + 1000
6 UIKit 0x3418b6c8 -[UIApplication sendEvent:] + 68
7 UIKit 0x3418b116 _UIApplicationHandleEvent + 6150
8 GraphicsServices 0x35e9659e _PurpleEventCallback + 586
9 GraphicsServices 0x35e961ce PurpleEventCallback + 30
10 CoreFoundation 0x3235816e __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 30
11 CoreFoundation 0x32358112 __CFRunLoopDoSource1 + 134
12 CoreFoundation 0x32356f94 __CFRunLoopRun + 1380
13 CoreFoundation 0x322c9eb8 CFRunLoopRunSpecific + 352
14 CoreFoundation 0x322c9d44 CFRunLoopRunInMode + 100
15 UIKit 0x341e2480 -[UIApplication _run] + 664
16 UIKit 0x341df2fc UIApplicationMain + 1116
