UIKit -[UIApplication sendAction:to:from:forEvent:] crash

Question

I ran into a very unusual problem.. i got a crash on UIKit.. first time i have faced something like this.. Please can anybody guide my in this..

This is the crash log that i got.

Crashed: com.apple.main-thread
EXC_BAD_ACCESS KERN_INVALID_ADDRESS at 0x1161a18c

Thread : Crashed: com.apple.main-thread
0  libobjc.A.dylib                0x386fcb66 objc_msgSend + 5
1  UIKit                          0x30b5dda3 -[UIApplication sendAction:to:from:forEvent:] + 90
2  UIKit                          0x30cc5615 -[UIBarButtonItem(UIInternal) _sendAction:withEvent:] + 120
3  UIKit                          0x30b5dda3 -[UIApplication sendAction:to:from:forEvent:] + 90
4  UIKit                          0x30b5dd3f -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 38
5  UIKit                          0x30b5dd13 -[UIControl sendAction:to:forEvent:] + 46
6  UIKit                          0x30b49743 -[UIControl _sendActionsForEvents:withEvent:] + 374
7  UIKit                          0x30b5d75b -[UIControl touchesEnded:withEvent:] + 594
8  UIKit                          0x30b5d425 -[UIWindow _sendTouchesForEvent:] + 528
9  UIKit                          0x30b58451 -[UIWindow sendEvent:] + 832
10 UIKit                          0x30b2dd79 -[UIApplication sendEvent:] + 196
11 UIKit                          0x30b2c569 _UIApplicationHandleEventQueue + 7116
12 CoreFoundation                 0x2e36ff1f __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 14
13 CoreFoundation                 0x2e36f3e7 __CFRunLoopDoSources0 + 206
14 CoreFoundation                 0x2e36dbd7 __CFRunLoopRun + 630
15 CoreFoundation                 0x2e2d8471 CFRunLoopRunSpecific + 524
16 CoreFoundation                 0x2e2d8253 CFRunLoopRunInMode + 106
17 GraphicsServices               0x330122eb GSEventRunModal + 138
18 UIKit                          0x30b8d845 UIApplicationMain + 1136
19 TradeMate                      0x0008f2bf main (main.m:16)

Answer 1

You are crashing in objc_msgSend. This means (as explained in this famous article) that the receiver has gone missing. In this case it appears that the user has tapped a button which sends an action message to a target, but the target object has gone out of existence.

Answer 2

Make sure the receiver or the object which receives the events is declared strong. You may not even get the crash log to figure out what what went wrong :)

If you are getting something like above check if the object is declared strong. That should solve the issue