为什么crashlytics没有在swift中显示确切的崩溃行号？它只显示方法名称。有没有其他方法来确定确切的行号。 IBAction方法发生崩溃。 实际上，我可以通过查看强制解包的代码但无法手动重现场景来识别崩溃。
用目标C和swift
编写的应用程序Crashlytics版本 - 3.4.0
崩溃日志如下：
#0. Crashed: com.apple.main-thread
0 AppName 0x100d246c4 specialized CrashingViewController.ButtonClicked(sender : UIButton) -> () + 4342810308
1 AppName 0x1008c7208 @objc CrashingViewController.ButtonClicked(sender : UIButton) -> () + 4338233864
2 AppName 0x1006192f8 @objc CrashingViewController.ButtonClicked(sender : UIButton) -> () + 4335424248
3 UIKit 0x18bb5c20c -[UIApplication sendAction:to:from:forEvent:] + 96
4 UIKit 0x18bb5c18c -[UIControl sendAction:to:forEvent:] + 80
5 UIKit 0x18bb46f4c -[UIControl _sendActionsForEvents:withEvent:] + 440
6 UIKit 0x18bb5ba80 -[UIControl touchesEnded:withEvent:] + 576
7 UIKit 0x18bb5b5a0 -[UIWindow _sendTouchesForEvent:] + 2544
8 UIKit 0x18bb56a70 -[UIWindow sendEvent:] + 3208
9 UIKit 0x18bb28078 -[UIApplication sendEvent:] + 340
10 AppName 0x1009c18d4 -[BCApplication sendEvent:] + 4339259604
11 UIKit 0x18c467f98 __dispatchPreprocessedEventFromEventQueue + 2364
12 UIKit 0x18c46a408 __handleEventQueueInternal + 4760
13 UIKit 0x18c463574 __handleHIDEventFetcherDrain + 152
14 CoreFoundation 0x1826c0358 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 24
15 CoreFoundation 0x1826c02d8 __CFRunLoopDoSource0 + 88
16 CoreFoundation 0x1826bfb60 __CFRunLoopDoSources0 + 204
17 CoreFoundation 0x1826bd738 __CFRunLoopRun + 1048
18 CoreFoundation 0x1825de2d8 CFRunLoopRunSpecific + 436
19 GraphicsServices 0x18446ff84 GSEventRunModal + 100
20 UIKit 0x18bb8b880 UIApplicationMain + 208
21 AppName 0x100d64f10 main (main.m:6)
22 libdyld.dylib 0x18210256c start + 4