iOS - Unable to locate the location of Exception - ios

Question

What is happening?
I am getting an exception in a program where a function is to be called On a Button tap on a custom view within contentView of a UItableViewCell
What i have tried?
1) I tried to add a Global Exception point in the Breakpoints Navigator
2) Checked Zombie Detection from Instruments
3) Breakpoints in the functions that should be called
Crash Log that i receive?
-[UIImageView nextPage:]: unrecognized selector sent to instance 0xa7d5f20
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIImageView nextPage:]: unrecognized selector sent to instance 0xa7d5f20'
*** First throw call stack:
(
0 CoreFoundation 0x023e11e4 __exceptionPreprocess + 180
1 libobjc.A.dylib 0x01fc98e5 objc_exception_throw + 44
2 CoreFoundation 0x0247e243 -[NSObject(NSObject) doesNotRecognizeSelector:] + 275
3 CoreFoundation 0x023d150b ___forwarding___ + 1019
4 CoreFoundation 0x023d10ee _CF_forwarding_prep_0 + 14
5 libobjc.A.dylib 0x01fdb880 -[NSObject performSelector:withObject:withObject:] + 77
6 UIKit 0x009463b9 -[UIApplication sendAction:to:from:forEvent:] + 108
7 UIKit 0x00946345 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 61
8 UIKit 0x00a47bd1 -[UIControl sendAction:to:forEvent:] + 66
9 UIKit 0x00a47fc6 -[UIControl _sendActionsForEvents:withEvent:] + 577
10 UIKit 0x00a47243 -[UIControl touchesEnded:withEvent:] + 641
11 UIKit 0x00cdc2e3 _UIGestureRecognizerUpdate + 7166
12 UIKit 0x00985a5a -[UIWindow _sendGesturesForEvent:] + 1291
13 UIKit 0x00986971 -[UIWindow sendEvent:] + 1021
14 UIKit 0x009585f2 -[UIApplication sendEvent:] + 242
15 UIKit 0x00942353 _UIApplicationHandleEventQueue + 11455
16 CoreFoundation 0x0236a77f __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
17 CoreFoundation 0x0236a10b __CFRunLoopDoSources0 + 235
18 CoreFoundation 0x023871ae __CFRunLoopRun + 910
19 CoreFoundation 0x023869d3 CFRunLoopRunSpecific + 467
20 CoreFoundation 0x023867eb CFRunLoopRunInMode + 123
21 GraphicsServices 0x0381a5ee GSEventRunModal + 192
22 GraphicsServices 0x0381a42b GSEventRun + 104
23 UIKit 0x00944f9b UIApplicationMain + 1225
24 IslamBox 0x000029bc main + 76
25 libdyld.dylib 0x034b3701 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
What else could i do as the functions are registered in the Nib file?
UPDATE: as the log says -[UIImageView nextpage] is unrecognized however the next page is in the ViewController. as the custom view is the ViewController's view added to the cell's contentView.

Answer 1

I need to retain my ViewController , or keep a strong reference to it if using ARC. If I assign it to cell.contentView as a local variable, it's not going to be around any more when nextPage: gets called. (The error shows that its memory has been released and re-used for a different type of object.)

Answer 2

Could it be just the fact that the object in your xib file is set as UIImageView instead of your own custom subclass of UIImageView ?
When the view is allocated from your xib, it will be a UIImageView. Having it linked to something different in your .h or .m won't change that.
Change it here :

Answer 3

if every time crash on [UIImageView nextPage:],
you can try
#implementation UIImageView(Test)
- (id)nextPage:(id)noUse
{
return nil;
}
#end
and set a breakpoint on the return.