Example App Crash: First time accessing device media library before giving permission.

[aerych]

Expected behavior

To edit a photo in the local device photo library.

Actual behavior

Prompted for permission to access Photos then crashed.

Steps to reproduce the behavior

Settings app > General > Reset > Reset Location & Privacy > Reset Warnings. Example app > Main screen > Image Editing > Device Library > Edit button. 💥 Works fine on the next launch.

Tested on [device], iOS [version], WPiOS [version]

iPhone X Simulator

Stack Trace

2020-02-10 13:40:58.540740-0600 Example[55893:1421849] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'attempt to scroll to invalid index path: <NSIndexPath: 0x60c000223c40> {length = 2, path = 0 - 0}' *** First throw call stack: ( 0 CoreFoundation 0x000000010b95b1e6 __exceptionPreprocess + 294 1 libobjc.A.dylib 0x0000000107687031 objc_exception_throw + 48 2 CoreFoundation 0x000000010b9d0975 +[NSException raise:format:] + 197 3 UIKit 0x00000001097c73ef -[UICollectionView _contentOffsetForScrollingToItemAtIndexPath:atScrollPosition:] + 212 4 UIKit 0x00000001097c7e5b -[UICollectionView _scrollToItemAtIndexPath:atScrollPosition:animated:] + 70 5 UIKit 0x00000001097af155 -[UICollectionView _selectItemAtIndexPath:animated:scrollPosition:notifyDelegate:] + 537 6 UIKit 0x00000001097af29b -[UICollectionView selectItemAtIndexPath:animated:scrollPosition:] + 129 7 MediaEditor 0x0000000106feee4b $s11MediaEditor0aB3HubC25reloadImagesAndReposition33_9A39579BAD8EDF62FEB03FFB3FF99D41LLyyF + 1595 8 MediaEditor 0x0000000106feb110 $s11MediaEditor0aB3HubC24traitCollectionDidChangeyySo07UITraitE0CSgF + 128 9 MediaEditor 0x0000000106feb164 $s11MediaEditor0aB3HubC24traitCollectionDidChangeyySo07UITraitE0CSgFTo + 68 10 UIKit 0x0000000108e93288 -[UIViewController _traitCollectionDidChange:] + 108 11 UIKit 0x0000000108e933ab -[UIViewController _updateTraitsIfNecessary] + 269 12 UIKit 0x0000000108dc05f3 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1078 13 QuartzCore 0x000000010beb2456 -[CALayer layoutSublayers] + 177 14 QuartzCore 0x000000010beb6667 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 395 15 UIKit 0x0000000108daa62d -[UIView(Hierarchy) layoutBelowIfNeeded] + 662 16 MediaEditor 0x0000000106fee949 $s11MediaEditor0aB3HubC25reloadImagesAndReposition33_9A39579BAD8EDF62FEB03FFB3FF99D41LLyyF + 313 17 MediaEditor 0x0000000106feb110 $s11MediaEditor0aB3HubC24traitCollectionDidChangeyySo07UITraitE0CSgF + 128 18 MediaEditor 0x0000000106feb164 $s11MediaEditor0aB3HubC24traitCollectionDidChangeyySo07UITraitE0CSgFTo + 68 19 UIKit 0x0000000108e93288 -[UIViewController _traitCollectionDidChange:] + 108 20 UIKit 0x0000000108e933ab -[UIViewController _updateTraitsIfNecessary] + 269 21 UIKit 0x0000000108dc05f3 -[UIView(CALayerDelegate) layoutSublayersOfLayer:] + 1078 22 QuartzCore 0x000000010beb2456 -[CALayer layoutSublayers] + 177 23 QuartzCore 0x000000010beb6667 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 395 24 QuartzCore 0x000000010be3d0fb _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 343 25 QuartzCore 0x000000010be6a79c _ZN2CA11Transaction6commitEv + 568 26 UIKit 0x0000000108d19f2c _afterCACommitHandler + 272 27 CoreFoundation 0x000000010b8fd607 CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION + 23 28 CoreFoundation 0x000000010b8fd55e __CFRunLoopDoObservers + 430 29 CoreFoundation 0x000000010b8e1b81 __CFRunLoopRun + 1537 30 CoreFoundation 0x000000010b8e130b CFRunLoopRunSpecific + 635 31 GraphicsServices 0x000000010fa36a73 GSEventRunModal + 62 32 UIKit 0x0000000108cf1057 UIApplicationMain + 159 33 Example 0x0000000106c6418b main + 75 34 libdyld.dylib 0x000000010d493955 start + 1 ) libc++abi.dylib: terminating with uncaught exception of type NSException

Screen shot of the moment of the crash