[iOSAppOnMac] ShareKit: Crashes in SHKItemIsPDF() or -[SHKSaveToFilesSharingService saveFileURL:completion:]

UI Frameworks UIKit
tkmcintosh
tkmcintosh OP
Created Jun ’24
Replies 7
Boosts 3
Views 560
Participants 6

I have a custom document-based iOS app that also runs on macOS. After implementing -activityItemsConfiguration to enable sharing from the context menu, I found that the app crashes on macOS when selecting Share… from the context menu and then selecting Save (i.e. Save to Files under iOS). This problem does not occur on iOS, which behaves correctly.

- (id<UIActivityItemsConfigurationReading>)activityItemsConfiguration {
    NSItemProvider * provider = [[NSItemProvider alloc] initWithContentsOfURL:self.document.presentedItemURL];
    UIActivityItemsConfiguration * configuration = [UIActivityItemsConfiguration activityItemsConfigurationWithItemProviders:@[ provider ]];
 
    // *** crashes with com.apple.share.System.SaveToFiles
 
    return configuration;
}

Additionally, I found that to even reach this crash, the workaround implemented in the NSItemProvider (FBxxx) category of the sample project is needed. Without this, the app will crash much earlier, due to SHKItemIsPDF() erroneously invoking -pathExtension on an NSItemProvider. This appears to be a second bug in Apple’s private ShareKit framework.

#import <UniformTypeIdentifiers/UniformTypeIdentifiers.h>
 
@implementation NSItemProvider (FBxxx)
// *** SHKItemIsPDF() invokes -pathExtension on an NSItemProvider (when running under macOS, anyway) -> crash
- (NSString *)pathExtension {
    return self.registeredContentTypes.firstObject.preferredFilenameExtension;
}
@end

Again, this all works fine on iOS (17.5) but crashes when the exact same app build is running on macOS (14.5).

I believe these bugs are Apple's. Any idea how to avoid the crash? Is there a way to disable the "Save to Files" option in the sharing popup?

I filed FB13819800 with a sample project that demonstrates the crash on macOS. I was going to file a TSI to get this resolved, but I see that DTS is not responding to tech support incidents until after WWDC.

Replies  7
Boosts  3
Views  560
Participants  6
andrew223
andrew223 OP
Aug ’24

I also am facing this crash, in my case my using a SwiftUI ShareLink with a FileRepresentation specifying any file-like exportedContentType.

Did you find a solution?

0
AJeffery
AJeffery OP
Jan ’25

I think I'm seeing something similar. I have a ShareLink with a string value and a Preview. If the user tries to save it to a file on iOS, it works fine. When I run the same on Mac (built for iPad, so not Mac Catalyst), I get a crash. All other options on the Share sheet works except Save to files. If I remove the preview, it removes the save to files option.

I wonder if it something to do with sandbox access for Mac apps built for iPad?

0
shaynez
shaynez OP
Mar ’25

I am having a similar problem. I have an iOS app which works fine. When I run on my Mac (built for iPad, not Mac Catalyst) it crashes when trying to save to a file. It is crashing in the call SHKSaveToFilesSharingService->[NSSavePanel setNameFieldStringValue:]

I have attempted the share using simple text rather than a file and the results are the same. So the problem doesn't appear to be with saving a file, but rather with saving TO a file. This suggests that it is not a sandbox access problem.

Other share options work correctly, both with a file and a string.

1
fabaroux
fabaroux OP
Mar ’25

I have same issue as well, when using Transferable in macOS with a .pdf or .file type I get the crash -[NSItemProvider pathExtension]: unrecognized selector sent to instance 0x600003a7d110

1
Slif
Slif OP
Jun ’25

Another vote, SwiftUI ShareLink, saving a CSV.

1
tkmcintosh
tkmcintosh OP
Jun ’25

Problem still occurs on macOS 15.5 (24F74).

I've received no updates from Apple in FB13819800 since filing this a year ago with sample project that reproduces the problem.

Could mean they're fixing it in Next Major OS, but we really should have a fix in macOS 15.x at least, preferably 13.x+ in my case.

For the record, here's the log up to the first exception on macOS 15.5:

Save: timed out loading URL
*** Assertion failure in -[NSSavePanel setNameFieldStringValue:], NSSavePanel.m:1347
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid parameter not satisfying: aString != nil'
*** First throw call stack:
(
	0   CoreFoundation                      0x0000000195f32ca0 __exceptionPreprocess + 176
	1   libobjc.A.dylib                     0x00000001959f6b90 objc_exception_throw + 88
	2   Foundation                          0x0000000197541a78 -[NSCalendarDate initWithCoder:] + 0
	3   AppKit                              0x000000019aaedd90 -[NSSavePanel setNameFieldStringValue:] + 560
	4   ShareKit                            0x00000001c8953ce0 -[SHKSaveToFilesSharingService saveFileURL:completion:] + 116
	5   ShareKit                            0x00000001c89542b4 -[SHKSaveToFilesSharingService save:completion:] + 80
	6   ShareKit                            0x00000001c8954508 __49-[SHKSaveToFilesSharingService performWithItems:]_block_invoke.46 + 60
	7   ShareKit                            0x00000001c8919778 -[SHKSharingService _runActionBlockWithItems:completion:] + 144
	8   ShareKit                            0x00000001c891c8f8 -[SHKSharingService performCustomServiceWithItems:] + 348
	9   ShareKit                            0x00000001c891c6e8 -[SHKSharingService performWithItems:] + 2504
	10  ShareKit                            0x00000001c8954408 -[SHKSaveToFilesSharingService performWithItems:] + 296
	11  ShareKit                            0x00000001c891bcfc -[SHKSharingService performWithItems:completion:] + 64
	12  ShareKit                            0x00000001c892db50 -[SHKSharingServicePicker _performSharingService:] + 912
	13  ShareKit                            0x00000001c892dc64 -[SHKSharingServicePicker _handleItemsReady] + 76
	14  ShareKit                            0x00000001c8931c98 __55-[SHKSharingServicePicker _performItemLoadsIfNecessary]_block_invoke + 32
	15  ShareKit                            0x00000001c892a490 -[SHKSharingServicePicker _loadSendCopyRepresentationIfNecessaryWithCompletionHandler:] + 180
	16  ShareKit                            0x00000001c8931c3c -[SHKSharingServicePicker _performItemLoadsIfNecessary] + 128
	17  ShareKit                            0x00000001c8931b74 -[SHKSharingServicePicker _performSelectedService] + 1176
	18  ShareKit                            0x00000001c89356e8 -[SHKSharingServicePicker _performActionWithIdentifier:] + 356
	19  ShareKit                            0x00000001c8955374 __65-[SHKShareSheetRemoteViewController performActionWithIdentifier:]_block_invoke + 56
	20  libdispatch.dylib                   0x000000010342c514 _dispatch_call_block_and_release + 32
	21  libdispatch.dylib                   0x00000001034492dc _dispatch_client_callout + 16
	22  libdispatch.dylib                   0x000000010346cc94 _dispatch_main_queue_drain.cold.5 + 900
	23  libdispatch.dylib                   0x000000010343dd98 _dispatch_main_queue_drain + 180
	24  libdispatch.dylib                   0x000000010343dcd4 _dispatch_main_queue_callback_4CF + 44
	25  CoreFoundation                      0x0000000195effda4 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 16
	26  CoreFoundation                      0x0000000195ec0a9c __CFRunLoopRun + 1980
	27  CoreFoundation                      0x0000000195ebfc58 CFRunLoopRunSpecific + 572
	28  HIToolbox                           0x00000001a195427c RunCurrentEventLoopInMode + 324
	29  HIToolbox                           0x00000001a19574e8 ReceiveNextEventCommon + 676
	30  HIToolbox                           0x00000001a1ae2484 _BlockUntilNextEventMatchingListInModeWithFilter + 76
	31  AppKit                              0x0000000199de7ab4 _DPSNextEvent + 684
	32  AppKit                              0x000000019a7865b0 -[NSApplication(NSEventRouting) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 688
	33  AppKit                              0x0000000199ddac64 -[NSApplication run] + 480
	34  AppKit                              0x0000000199db135c NSApplicationMain + 880
	35  AppKit                              0x0000000199ffdcf4 +[NSWindow _savedFrameFromString:] + 0
	36  UIKitMacHelper                      0x00000001b13e4164 UINSApplicationMain + 976
	37  UIKitCore                           0x00000001c9a57c9c UIApplicationMain + 148
	38  MobileRC6502.debug.dylib            0x0000000103620590 __debug_main_executable_dylib_entry_point + 188
	39  dyld                                0x0000000195a36b98 start + 6076
)
0
tkmcintosh
tkmcintosh OP
2w

Problem persists in macOS 26.0 Beta (25A5279m).

0
[iOSAppOnMac] ShareKit: Crashes in SHKItemIsPDF() or -[SHKSaveToFilesSharingService saveFileURL:completion:]
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