O Fenômeno O Fenômeno - 2 months ago 12
iOS Question

Photos Framework crash: 'This application is not allowed to access Photo data.'

App crashes if photo access permission is not granted and the object which asked for permission is about to deallocate.

Apple's sample code (for Photos framework) crashes too.

My app crashes with following stack trace:


*** Terminating app due to uncaught exception 'NSObjectInaccessibleException', reason: 'This application is not allowed to access Photo data.'


*** First throw call stack:
(
0 CoreFoundation 0x000000010a324f65 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x000000010c030deb objc_exception_throw + 48
2 PhotoLibraryServices 0x000000011c1f7e2d -[PLPhotoLibrary initWithTransientContext:name:] + 1183
3 Photos 0x000000011bd6a445 __30-[PHPhotoLibrary photoLibrary]_block_invoke + 59
4 libdispatch.dylib 0x0000000110f5e49b _dispatch_client_callout + 8
5 libdispatch.dylib 0x0000000110f49e28 dispatch_once_f + 543
6 Photos 0x000000011bd6a404 -[PHPhotoLibrary photoLibrary] + 140
7 Photos 0x000000011bd3e5e8 -[PHCoreImageManager _cancelAndFlushPreheatItemsForAssets:CPLPrefetching:domain:operation:passingTestHandler:didCancelHandler:] + 174
8 Photos 0x000000011bd5900c -[PHImageManager dealloc] + 176
9 libobjc.A.dylib 0x000000010c044afe _ZN11objc_object17sidetable_releaseEb + 232
10 MyApp 0x000000010f271812 _TToFC12MyApp16PhotosDataSourceE + 66
11 libobjc.A.dylib 0x000000010c02f7bb _ZL27object_cxxDestructFromClassP11objc_objectP10objc_class + 127
12 libobjc.A.dylib 0x000000010c03a390 objc_destructInstance + 93
13 libobjc.A.dylib 0x000000010c03a3c3 object_dispose + 22
14 MyApp 0x000000010f271796 _TFC12MyApp16PhotosDataSourceD + 198
15 MyApp 0x000000010f2717c2 _TToFC12MyApp16PhotosDataSourceD + 34
16 libobjc.A.dylib 0x000000010c044afe _ZN11objc_object17sidetable_releaseEb + 232
17 MyApp 0x000000010f2668f2 _TToFC12MyApp25PhotoPickerViewControllerE + 178
18 libobjc.A.dylib 0x000000010c02f7bb _ZL27object_cxxDestructFromClassP11objc_objectP10objc_class + 127
19 libobjc.A.dylib 0x000000010c03a390 objc_destructInstance + 93
20 libobjc.A.dylib 0x000000010c03a3c3 object_dispose + 22
21 UIKit 0x000000010adb54b9 -[UIResponder dealloc] + 130
22 UIKit 0x000000010ad40721 -[UIViewController dealloc] + 1949
23 UIKit 0x000000010ad1c97b -[UIPresentationController .cxx_destruct] + 262
24 libobjc.A.dylib 0x000000010c02f7bb _ZL27object_cxxDestructFromClassP11objc_objectP10objc_class + 127
25 libobjc.A.dylib 0x000000010c03a390 objc_destructInstance + 93
26 libobjc.A.dylib 0x000000010c03a3c3 object_dispose + 22
27 UIKit 0x000000010ad185db -[UIPresentationController dealloc] + 56
28 UIKit 0x000000010b4a9046 -[_UIFullscreenPresentationController dealloc] + 56
29 libobjc.A.dylib 0x000000010c044afe _ZN11objc_object17sidetable_releaseEb + 232
30 UIKit 0x000000010ad1838c __destroy_helper_block_411 + 24
31 libsystem_blocks.dylib 0x0000000110fdb6b1 _Block_release + 128
32 UIKit 0x000000010b568d9c -[_UIViewControllerTransitionContext .cxx_destruct] + 94
33 libobjc.A.dylib 0x000000010c02f7bb _ZL27object_cxxDestructFromClassP11objc_objectP10objc_class + 127
34 libobjc.A.dylib 0x000000010c03a390 objc_destructInstance + 93
35 libobjc.A.dylib 0x000000010c03a3c3 object_dispose + 22
36 UIKit 0x000000010b567825 -[_UIViewControllerTransitionContext dealloc] + 56
37 UIKit 0x000000010b568e51 -[_UIViewControllerOneToOneTransitionContext dealloc] + 79
38 libobjc.A.dylib 0x000000010c044afe _ZN11objc_object17sidetable_releaseEb + 232
39 MyApp 0x000000010d4818d2 block_destroy_helper + 66
40 MyApp 0x000000010d481988 _TPA__TFFC16MyApp31CustomShrinkAnimator17animateTransitionFS0_FPSo36UIViewControllerContextTransitioning_T_U0_FSbT_ + 152
41 MyApp 0x000000010d481a28 _TPA__TTRXFo_dSb_dT__XFo_iSb_iT__ + 120
42 MyApp 0x000000010d481aed block_destroy_helper8 + 13
43 libsystem_blocks.dylib 0x0000000110fdb6b1 _Block_release + 128
44 UIKit 0x000000010ac5ee47 -[UIViewAnimationBlockDelegate .cxx_destruct] + 43
45 libobjc.A.dylib 0x000000010c02f7bb _ZL27object_cxxDestructFromClassP11objc_objectP10objc_class + 127
46 libobjc.A.dylib 0x000000010c03a390 objc_destructInstance + 93
47 libobjc.A.dylib 0x000000010c03a3c3 object_dispose + 22
48 libobjc.A.dylib 0x000000010c044afe _ZN11objc_object17sidetable_releaseEb + 232
49 CoreFoundation 0x000000010a228d4d -[__NSDictionaryI dealloc] + 141
50 libobjc.A.dylib 0x000000010c044afe _ZN11objc_object17sidetable_releaseEb + 232
51 libobjc.A.dylib 0x000000010c0450b8 _ZN12_GLOBAL__N_119AutoreleasePoolPage3popEPv + 488
52 CoreFoundation 0x000000010a2129c6 _CFAutoreleasePoolPop + 22
53 CoreFoundation 0x000000010a246941 __CFRunLoopRun + 2081
54 CoreFoundation 0x000000010a245e98 CFRunLoopRunSpecific + 488
55 GraphicsServices 0x0000000112598ad2 GSEventRunModal + 161
56 UIKit 0x000000010abb8676 UIApplicationMain + 171
57 MyApp 0x00000001082b470d main + 109
58 libdyld.dylib 0x0000000110f9392d start + 1
59 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException


Any pointers would be really appreciated.

Answer

This is expected behaviour. Before you use any methods (like fetching, changing) of the Photos Framework, check the permission status to the Photo-Library. This is done by calling the authorizationStatus method of PHPhotoLibrary. If this method PHAuthorizationStatusNotDetermined,ask for permission using the requestAuthorization method. If authorizationStatushas a value of PHAuthorizationStatusDenied fall gracefully. The main point is to let requestAuthorization prompt for access to the Photo-Library and not the fetch methods directly.