请教使用BSBacktraceLogger的意义

[lefex]

请教一下为什么要引入 BSBacktraceLogger 这个库来获取调用堆栈，不直接使用系统提供的方法，是有什么深意吗？[NSThread callStackSymbols] 这个API我觉得完全可以胜任。

使用 BSBacktraceLogger 打印的堆栈信息：

BSBacktraceLogger: Backtrace of Thread 14851:
libsystem_kernel.dylib 0x1091c820a mach_msg_trap + 10
libsystem_kernel.dylib 0x1091c43b3 thread_get_state + 403
BeeHiveDemo 0x103548a1a bs_mach_copyMem + 58
BeeHiveDemo 0x103548103 _bs_backtraceOfThread + 675
BeeHiveDemo 0x103547e2b +[BSBacktraceLogger bs_backtraceOfNSThread:] + 59
BeeHiveDemo 0x103548729 +[BSBacktraceLogger bs_backtraceOfCurrentThread] + 89
BeeHiveDemo 0x103601f7a -[UIView(DoraemonSubThreadUICheck) uiCheck] + 170
BeeHiveDemo 0x103601e58 -[UIView(DoraemonSubThreadUICheck) doraemon_setNeedsDisplay] + 72
UIKitCore 0x10efce01e -[UILabel setNeedsDisplay] + 53
UIKitCore 0x10f43ee4e -[UIView _createLayerWithFrame:] + 937
UIKitCore 0x10f43f817 UIViewCommonInitWithFrame + 856
UIKitCore 0x10f43f481 -[UIView initWithFrame:] + 98
UIKitCore 0x10efc4b06 -[UILabel initWithFrame:] + 62
UIKitCore 0x10f43ea9f -[UIView init] + 44
UIKitCore 0x10f714b00 -[_UINavigationBarContentView _setupTitleViewAnimated:] + 778
UIKitCore 0x10f71690e -[_UINavigationBarContentView updateContentAnimated:] + 86
UIKitCore 0x10f74d417 -[_UINavigationBarVisualProviderModernIOS _updateContentForTopItem:backItem:animated:] + 1926
UIKitCore 0x10f751105 -[_UINavigationBarVisualProviderModernIOS navigationItemUpdatedTitleContent:animated:] + 214
UIKitCore 0x10f05a9f3 -[UINavigationItem _notifyObserver_navigationItemUpdatedTitleContentAnimated:] + 62
UIKitCore 0x10f05a849 -[UINavigationItem setTitle:] + 247
UIKitCore 0x10f48b56e -[UIViewController setTitle:] + 127
BeeHiveDemo 0x10350db51 __29-[ViewController viewDidLoad]_block_invoke + 49
libdispatch.dylib 0x108e1d5d1 _dispatch_call_block_and_release + 12
libdispatch.dylib 0x108e1e63e _dispatch_client_callout + 8
libdispatch.dylib 0x108e210a0 _dispatch_queue_override_invoke + 1028
libdispatch.dylib 0x108e2f028 _dispatch_root_queue_drain + 351
libdispatch.dylib 0x108e2f9cd _dispatch_worker_thread2 + 130
libsystem_pthread.dylib 0x109208169 _pthread_wqthread + 1387
libsystem_pthread.dylib 0x109207be9 start_wqthread + 13

使用 [NSThread callStackSymbols] 打印的堆栈信息:
callStackSymbols: (
0 BeeHiveDemo 0x0000000103601fbd -[UIView(DoraemonSubThreadUICheck) uiCheck] + 237
1 BeeHiveDemo 0x0000000103601e58 -[UIView(DoraemonSubThreadUICheck) doraemon_setNeedsDisplay] + 72
2 UIKitCore 0x000000010efce01e -[UILabel setNeedsDisplay] + 53
3 UIKitCore 0x000000010f43ee4e -[UIView _createLayerWithFrame:] + 937
4 UIKitCore 0x000000010f43f817 UIViewCommonInitWithFrame + 856
5 UIKitCore 0x000000010f43f481 -[UIView initWithFrame:] + 98
6 UIKitCore 0x000000010efc4b06 -[UILabel initWithFrame:] + 62
7 UIKitCore 0x000000010f43ea9f -[UIView init] + 44
8 UIKitCore 0x000000010f714b00 -[_UINavigationBarContentView _setupTitleViewAnimated:] + 778
9 UIKitCore 0x000000010f71690e -[_UINavigationBarContentView updateContentAnimated:] + 86
10 UIKitCore 0x000000010f74d417 -[_UINavigationBarVisualProviderModernIOS _updateContentForTopItem:backItem:animated:] + 1926
11 UIKitCore 0x000000010f751105 -[_UINavigationBarVisualProviderModernIOS navigationItemUpdatedTitleContent:animated:] + 214
12 UIKitCore 0x000000010f05a9f3 -[UINavigationItem _notifyObserver_navigationItemUpdatedTitleContentAnimated:] + 62
13 UIKitCore 0x000000010f05a849 -[UINavigationItem setTitle:] + 247
14 UIKitCore 0x000000010f48b56e -[UIViewController setTitle:] + 127
15 BeeHiveDemo 0x000000010350db51 __29-[ViewController viewDidLoad]_block_invoke + 49
16 libdispatch.dylib 0x0000000108e1d5d1 _dispatch_call_block_and_release + 12
17 libdispatch.dylib 0x0000000108e1e63e _dispatch_client_callout + 8
18 libdispatch.dylib 0x0000000108e210a0 _dispatch_queue_override_invoke + 1028
19 libdispatch.dylib 0x0000000108e2f028 _dispatch_root_queue_drain + 351
20 libdispatch.dylib 0x0000000108e2f9cd _dispatch_worker_thread2 + 130
21 libsystem_pthread.dylib 0x0000000109208169 _pthread_wqthread + 1387
22 libsystem_pthread.dylib 0x0000000109207be9 start_wqthread + 13
)