App seems to be crashing in UIKit when it is running on iPad.
Has anyone experienced this crash. Here is crash report. Not able to reproduce consistently.
adding a root view controller <UISplitViewController: 0x10b527030> as a child of view controller:<UISplitViewController: 0x10b527030>
Thread 0 Crashed:
0 CoreFoundation 0x32dd56684 __exceptionPreprocess
1 libobjc.A.dylib 0x31e1f2190 objc_exception_throw
2 CoreFoundation 0x32de4a6a8 +[NSException raise:format:]
3 UIKitCore 0x3321e3cf8 -[UIViewController _addChildViewController:]
4 UIKitCore 0x3321e36fc -[UIViewController _addChildViewController:performHierarchyCheck:notifyWillMove:]
5 UIKitCore 0x3323a2e40 -[UISplitViewController addChildViewController:]
6 UIKitCore 0x3323a2a5c -[UIPanelController _addIdentifiedChildViewController:]
7 UIKitCore 0x332488c7c __56-[UIPanelController _collapseWithTransitionCoordinator:]_block_invoke_4
8 UIKitCore 0x332488a84 +[UIPanelController _withDisabledAppearanceTransitions:forVisibleDescendantsOf:perform:]
9 UIKitCore 0x332488750 -[UIPanelController _withDisabledAppearanceTransitionsPerform:]
10 UIKitCore 0x3324886b0 __56-[UIPanelController _collapseWithTransitionCoordinator:]_block_invoke_3
11 UIKitCore 0x332357dcc +[UIViewController _performWithoutDeferringTransitionsAllowingAnimation:actions:]
12 UIKitCore 0x33205a104 __56-[UIPanelController _collapseWithTransitionCoordinator:]_block_invoke_2
13 UIKitCore 0x332057810 +[UIView(Animation) performWithoutAnimation:]
14 UIKitCore 0x3323c0714 __56-[UIPanelController _collapseWithTransitionCoordinator:]_block_invoke
15 UIKitCore 0x3322b18bc -[_UIViewControllerTransitionCoordinator _applyBlocks:releaseBlocks:]
16 UIKitCore 0x3322b17b4 -[_UIViewControllerTransitionContext __runAlongsideAnimations]
17 UIKitCore 0x332840498 -[_UIWindowAnimationController animateTransition:]
18 UIKitCore 0x3324dd8ac -[UIWindow _adjustSizeClassesAndResizeWindowToFrame:]
19 UIKitCore 0x3321465a4 -[UIWindow _resizeWindowFrameToSceneBoundsIfNecessary]
20 UIKitCore 0x332145aa4 -[UIWindow _sceneBoundsDidChange]
21 UIKitCore 0x33232b470 -[_UIScenefbsSceneBasedMetricsCalculator _updateMetricsOnWindows:animated:]
22 UIKitCore 0x33232b0b0 -[UIWindowScene _computeMetricsForWindows:animated:]
23 UIKitCore 0x3321a5d7c __55-[UIWindowScene _computeMetrics:withTransitionContext:]_block_invoke
24 UIKitCore 0x3323d3b84 -[UIWindowScene _computeTraitCollectionAndCoordinateSpaceForcingDelegateCallback:withAction:]
25 UIKitCore 0x3323d448c -[UIWindowScene _computeMetrics:withTransitionContext:]
26 UIKitCore 0x3325f2d70 ___UIWindowHostingScenePerformUpdateWithEffectiveSettings_block_invoke_2
27 UIKitCore 0x332357dcc +[UIViewController _performWithoutDeferringTransitionsAllowingAnimation:actions:]
28 UIKitCore 0x3325f2cf8 ___UIWindowHostingScenePerformUpdateWithEffectiveSettings_block_invoke
29 UIKitCore 0x332057810 +[UIView(Animation) performWithoutAnimation:]
30 UIKitCore 0x3325f1df4 _UIWindowHostingScenePerformUpdateWithEffectiveSettings
31 UIKitCore 0x3325f1d10 -[UIScene _guardedSetOverrideSettings:]
32 UIKitCore 0x3325f1f0c -[UIScene _applyOverrideSettings:forActions:]
33 UIKitCore 0x332f64e98 -[UIWindowScene _applySnapshotSettings:forActions:]
34 UIKitCore 0x332d9c8e8 -[UIApplication _createSnapshotContextForScene:withName:performLayoutWithSettings:]
35 UIKitCore 0x332d9d93c __65-[UIApplication _performSnapshotsWithAction:forScene:completion:]_block_invoke_3
36 FrontBoardServices 0x35c734500 -[FBSSceneSnapshotAction _executeNextRequest]
37 FrontBoardServices 0x35c73451c [inlined] -[FBSSceneSnapshotAction _executeNextRequest]
38 FrontBoardServices 0x35c73451c -[FBSSceneSnapshotAction _executeNextRequest]
39 FrontBoardServices 0x35c733ff0 -[FBSSceneSnapshotAction executeRequestsWithHandler:completionHandler:expirationHandler:]
40 UIKitCore 0x332d9d88c __65-[UIApplication _performSnapshotsWithAction:forScene:completion:]_block_invoke_2
41 UIKitCore 0x332d9d1d0 -[UIApplication _beginSnapshotSessionForScene:withSnapshotBlock:]
42 UIKitCore 0x332d9d778 __65-[UIApplication _performSnapshotsWithAction:forScene:completion:]_block_invoke
43 UIKitCore 0x3325f1e58 -[UIScene _enableOverrideSettingsForActions:]
44 UIKitCore 0x3325f2078 -[UIScene _performSystemSnapshotWithActions:]
45 UIKitCore 0x332d9d610 -[UIApplication _performSnapshotsWithAction:forScene:completion:]
46 UIKitCore 0x3331a518c __98-[_UISceneSnapshotBSActionsHandler _respondToActions:forFBSScene:inUIScene:fromTransitionContext:]_block_invoke_3
47 UIKitCore 0x3331a5028 __98-[_UISceneSnapshotBSActionsHandler _respondToActions:forFBSScene:inUIScene:fromTransitionContext:]_block_invoke_2
48 UIKitCore 0x3321e41a8 -[UIScene _emitSceneSettingsUpdateResponseForCompletion:afterSceneUpdateWork:]
49 UIKitCore 0x3322a34b8 -[UIScene scene:didUpdateWithDiff:transitionContext:completion:]
50 UIKitCore 0x3322a30d0 -[UIApplicationSceneClientAgent scene:handleEvent:withCompletion:]
51 FrontBoardServices 0x35c6d814c -[FBSScene updater:didUpdateSettings:withDiff:transitionContext:completion:]
52 FrontBoardServices 0x35c6e72dc __94-[FBSWorkspaceScenesClient _queue_updateScene:withSettings:diff:transitionContext:completion:]_block_invoke_2
53 FrontBoardServices 0x35c6e7194 -[FBSWorkspace _calloutQueue_executeCalloutFromSource:withBlock:]
54 FrontBoardServices 0x35c6eb528 __94-[FBSWorkspaceScenesClient _queue_updateScene:withSettings:diff:transitionContext:completion:]_block_invoke
55 libdispatch.dylib 0x33cb02cbc _dispatch_client_callout
56 libdispatch.dylib 0x33caa6ea8 _dispatch_block_invoke_direct$VARIANT$mp
57 FrontBoardServices 0x35c6e86b0 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__
58 FrontBoardServices 0x35c6e8638 -[FBSMainRunLoopSerialQueue _targetQueue_performNextIfPossible]
59 FrontBoardServices 0x35c6e854c -[FBSMainRunLoopSerialQueue _performNextFromRunLoopSource]
60 CoreFoundation 0x32dd2b120 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__
61 CoreFoundation 0x32dd2b0b8 __CFRunLoopDoSource0
62 CoreFoundation 0x32dd28d9c __CFRunLoopDoSources0
63 CoreFoundation 0x32dd27f38 __CFRunLoopRun
64 CoreFoundation 0x32dd277d4 CFRunLoopRunSpecific
65 GraphicsServices 0x3ad1d5810 GSEventRunModal
66 UIKitCore 0x33239d264 -[UIApplication _run]
67 UIKitCore 0x332447908 UIApplicationMain
68 SampleApp 0x202627540 main (main.m:21)
69 <unknown> 0x1c740b228 <redacted>
I managed to fix the issue. When app goes into the background, iOS calls the delegate method
I was returning the instance of UISplitViewController in this method, hence app crashed. After returning the non UISplitViewController, crash is fixed