EXC_SOFTWARE / UNCAUGHT_NS_EXCEPTION - ios

Question

I have a crash occurring in life app which I can not reproduce on my devices. I have not been able to figure out what causes it. I studied to crash report but seem not to be able to understand what is causing this.
1 CoreFoundation __exceptionPreprocess + 1241536
2 libobjc.A.dylib objc_exception_throw + 34136
3 CoreFoundation -[NSObject(NSObject) doesNotRecognizeSelector:] + 1270388
4 CoreFoundation ___forwarding___ + 1258100
5 CoreFoundation _CF_forwarding_prep_0 + 185752
6 GLKit -[GLKViewController setPaused:] + 144836
7 GLKit -[GLKViewController _pauseByNotification] + 142828
8 CoreFoundation __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 823848
9 CoreFoundation _CFXRegistrationPost + 821548
10 CoreFoundation ___CFXNotificationPost_block_invoke + 820904
11 CoreFoundation -[_CFXNotificationRegistrar find:object:observer:enumerator:] + 1276824
12 CoreFoundation _CFXNotificationPost + 44016
13 Foundation -[NSNotificationCenter postNotificationName:object:userInfo:] + 26152
14 UIKit -[UIApplication _deactivateForReason:notify:] + 491392
15 UIKit __61-[UIApplication _sceneSettingsPreLifecycleEventDiffInspector]_block_invoke + 2711892
16 FrontBoardServices __52-[FBSSettingsDiffInspector inspectDiff:withContext:]_block_invoke.27 + 144868
17 Foundation __NSIndexSetEnumerate + 788368
18 BaseBoard -[BSSettingsDiff inspectChangesWithBlock:] + 208636
19 FrontBoardServices -[FBSSettingsDiff inspectOtherChangesWithBlock:] + 120484
20 FrontBoardServices -[FBSSettingsDiffInspector inspectDiff:withContext:] + 144320
21 UIKit __70-[UIApplication scene:didUpdateWithDiff:transitionContext:completion:]_block_invoke + 2717116
22 UIKit -[UIApplication scene:didUpdateWithDiff:transitionContext:completion:] + 2716256
23 UIKit -[UIApplicationSceneClientAgent scene:handleEvent:withCompletion:] + 6065056
24 FrontBoardServices __80-[FBSSceneImpl updater:didUpdateSettings:withDiff:transitionContext:completion:]_block_invoke.376 + 52104
25 FrontBoardServices __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 239800
26 FrontBoardServices -[FBSSerialQueue _performNext] + 239396
27 FrontBoardServices -[FBSSerialQueue _performNextFromRunLoopSource] + 240332
28 CoreFoundation __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 905844
29 CoreFoundation __CFRunLoopDoSources0 + 904124
30 CoreFoundation __CFRunLoopRun + 894908
31 CoreFoundation CFRunLoopRunSpecific + 36932
32 GraphicsServices GSEventRunModal + 49556
33 UIKit -[UIApplication _run] + 504568
34 UIKit UIApplicationMain + 483376
35 XXX main (XXXViewController.swift:14)
36 libdyld.dylib
start + 17844
Line 35 (only mention of code I wrote) is the XXXViewController class definition line:
class XXXViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
...
}
This ViewController calls an observer, which seems to be the problem. I am making sure the I remove all observers in the ViewControllers that use them in the deinit function.
deinit {
NSNotificationCenter.defaultCenter().removeObserver(self)
}
Does anybody have an idea what else could be going wrong?
UPDATE:
I register the observer like this ini init() (should I use viewDidLoad instead?):
NSNotificationCenter.defaultCenter().addObserver(self, selector:#selector(YViewController.dataUpdate(_:)), name: "DataChanged", object: nil)
and post the notification like this:
NSNotificationCenter.defaultCenter().postNotificationName("DataChanged", object: self, userInfo: nil)
The YViewController dataUpdate is as follows:
func dataUpdate(notification: NSNotification) {
//Some stuff is done
}
I use swift 2.0 for now and the crash has happened on iOS version 10.0.1-10.1.1

Answer 1

Just in case anybody lands here. The problem was that I was overwriting the base view of the GLKViewController instead of adding the new view as a subview. This became easily clear, when I switched to Crashlytics, which had more information about the crash.