我的崩溃只发生在iOS7上。它是随机重现的，问题是堆栈跟踪中没有用户代码，因此很难追踪，请帮助我们。
谢谢
崩溃日志：
Exception Type: SIGSEGV
Exception Codes: SEGV_ACCERR at 0x6001c121
Crashed Thread: 0
Thread 0 Crashed:
0 libobjc.A.dylib 0x39c36636 objc_msgSend + 15
1 UIKit 0x318b2fd6 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 30
2 UIKit 0x318b2fb0 -[UIControl sendAction:to:forEvent:] + 44
3 UIKit 0x3189e716 -[UIControl _sendActionsForEvents:withEvent:] + 374
4 UIKit 0x318b2a2e -[UIControl touchesEnded:withEvent:] + 590
5 UIKit 0x318b2700 -[UIWindow _sendTouchesForEvent:] + 528
6 UIKit 0x318ad6ca -[UIWindow sendEvent:] + 758
7 UIKit 0x318828cc -[UIApplication sendEvent:] + 196
8 UIKit 0x31880f76 __UIApplicationHandleEventQueue + 7102
9 CoreFoundation 0x2f02c20a ___CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 14
+ 14
10 CoreFoundation 0x2f02b6da ___CFRunLoopDoSources0 + 206
11 CoreFoundation 0x2f029ece ___CFRunLoopRun + 622
12 CoreFoundation 0x2ef94ebe CFRunLoopRunSpecific + 515
13 CoreFoundation 0x2ef94ca2 CFRunLoopRunInMode + 103
14 GraphicsServices 0x33ebb662 GSEventRunModal + 135
15 UIKit 0x318e114c UIApplicationMain + 1131
16 IPadTest 0x00957eca main (main.m:19)
17 libdyld.dylib 0x3a139ab6 _start + 2