Application crash on tap

[idoodler]

Hi, I am using MGSwipeTableCell I my application. Since I am using iOS 8 I am having issues. Sometimes it crashes my app. When I press on one of the button my app randomly crashes. I tried to set a breakpoint at
"-(BOOL)swipeTableCell:(MGSwipeTableCell*) cell tappedButtonAtIndex:(NSInteger) index direction:(MGSwipeDirection)direction fromExpansion:(BOOL) fromExpansion;" but when I set a breakpoint nothing crashes. Then I added an "NSLog();" and I saw, that it crashes before calling that delegate methode.

Sometimes there is no exception in the console, but sometimes there is the following message in the console.

2014-11-15 15:20:39.792 MyApp[2566:133071] -[**NSCFType buttonClicked:]: unrecognized selector sent to instance 0x7fa19db67f00
2014-11-15 15:20:39.798 MyApp[2566:133071] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFType buttonClicked:]: unrecognized selector sent to instance 0x7fa19db67f00'
* First throw call stack:
(
0 CoreFoundation 0x000000010f3a0f35 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x000000010f77cbb7 objc_exception_throw + 45
2 CoreFoundation 0x000000010f3a804d -[NSObject(NSObject) doesNotRecognizeSelector:] + 205
3 CoreFoundation 0x000000010f30027c __forwarding + 988
4 CoreFoundation 0x000000010f2ffe18 _CF_forwarding_prep_0 + 120
5 UIKit 0x000000010cde18be -[UIApplication sendAction:to:from:forEvent:] + 75
6 UIKit 0x000000010cee8410 -[UIControl _sendActionsForEvents:withEvent:] + 467
7 UIKit 0x000000010cee77df -[UIControl touchesEnded:withEvent:] + 522
8 UIKit 0x000000010ce27308 -[UIWindow _sendTouchesForEvent:] + 735
9 UIKit 0x000000010ce27c33 -[UIWindow sendEvent:] + 683
10 UIKit 0x000000010cdf49b1 -[UIApplication sendEvent:] + 246
11 UIKit 0x000000010ce01a7d _UIApplicationHandleEventFromQueueEvent + 17370
12 UIKit 0x000000010cddd103 _UIApplicationHandleEventQueue + 1961
13 CoreFoundation 0x000000010f2d6551 CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION + 17
14 CoreFoundation 0x000000010f2cc41d __CFRunLoopDoSources0 + 269
15 CoreFoundation 0x000000010f2cba54 __CFRunLoopRun + 868
16 CoreFoundation 0x000000010f2cb486 CFRunLoopRunSpecific + 470
17 GraphicsServices 0x0000000111a459f0 GSEventRunModal + 161
18 UIKit 0x000000010cde0420 UIApplicationMain + 1282
19 MyApp 0x000000010b6ce8af MyApp + 2123951
20 libdyld.dylib 0x0000000111f8a145 start + 1
21 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)

[MortimerGoro]

I can't reproduce this issue. Can you send me a testcase?

[SebC99]

I have a similar issue, but not random:

• tap one of the right button, which open a modal
• cancel the modal to come back to the table view
• tap the same button again -> crash

The only way I've found to cope with this issue is to define the buttons in prepareForReuse and not in awakeFromNib as I was doing before.

[nrgbodya]

Have the same issue.

To reproduce the bug I need to scroll the cell out of range so that -prepareForReuse is called and then open the cell and tap left button. The error is always that (buttonClicked:) selector was unrecognized but it is not always sent to NSCFType!! Most often it's being sent to UIPanGestureRecognizer, or I also saw it with UIImageView.

I was just able to make sure (buttonClicked:) selector is being assigned only to UIButtons. It seems the problem to be deeper.

I found out that if I comment out the -prepareForReuse or, as stated by @SebC99, or if I define the buttons again in -prepareForReuse, apart from -initWithStyle, this bug disappears.

[SebC99]

Another solution is to add the swipe buttons through the delegate method. And it's better in term of memory footprint

[MortimerGoro]

Fixed ;)