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I have a file-exporter class that was working in previous iOS versions. Now it is throwing an error saying the file can't be opened.

The function that opens the ShareSheet looks like this:

func share(log: Log, fileType: String, excludedActivityTypes: [UIActivity.ActivityType]? = nil ) { guard let source = (UIApplication.shared.connectedScenes.first as? UIWindowScene)?.windows.first?.rootViewController else { return } DispatchQueue.main.async { self.isSharing = true } let filename = dateFormatterShort.string(from: log.date) + "_\(log.takeOff)" let exportURL = save(filename, fileContents: fileContents, fileExt: fileExt) DispatchQueue.main.async { let vc = UIActivityViewController( activityItems: [exportURL], applicationActivities: nil ) vc.excludedActivityTypes = excludedActivityTypes vc.popoverPresentationController?.sourceView = source.view source.present(vc, animated: true) self.isSharing = false } return }

The log says:

"Writing CSV file with 11 entries." "Saved file to: file:///var/mobile/Containers/Data/Application/2E8013C8-DACF-4F53-8A73-18067C9B1812/Documents/21.07.23_Munich.csv" [ShareSheet] Failed to request default share mode for fileURL:file:///var/mobile/Containers/Data/Application/2E8013C8-DACF-4F53-8A73-18067C9B1812/Documents/21.07.23_Munich.csv error:Error Domain=NSOSStatusErrorDomain Code=-10814 "(null)" UserInfo={_LSLine=1569, _LSFunction=runEvaluator} [ShareSheet] Only support loading options for CKShare and SWY types. [ShareSheet] error fetching item for URL:file:///var/mobile/Containers/Data/Application/2E8013C8-DACF-4F53-8A73-18067C9B1812/Documents/21.07.23_Munich.csv : Error Domain=NSCocoaErrorDomain Code=256 "The file couldn’t be opened." [default] LaunchServices: store (null) or url (null) was nil: Error Domain=NSOSStatusErrorDomain Code=-54 "process may not map database" UserInfo={NSDebugDescription=process may not map database, _LSLine=66, _LSFunction=_LSServer_GetServerStoreForConnectionWithCompletionHandler} [default] Attempt to map database failed: permission was denied. This attempt will not be retried. [db] Failed to initialize client context with error Error Domain=NSOSStatusErrorDomain Code=-54 "process may not map database" UserInfo={NSDebugDescription=process may not map database, _LSLine=66, _LSFunction=_LSServer_GetServerStoreForConnectionWithCompletionHandler} [ShareSheet] error loading metadata for documentURL:file:///var/mobile/Containers/Data/Application/2E8013C8-DACF-4F53-8A73-18067C9B1812/Documents/21.07.23_Munich.csv error:Error Domain=NSFileProviderInternalErrorDomain Code=0 "No valid file provider found from URL file:///var/mobile/Containers/Data/Application/2E8013C8-DACF-4F53-8A73-18067C9B1812/Documents/21.07.23_Munich.csv." UserInfo={NSLocalizedDescription=No valid file provider found from URL file:///var/mobile/Containers/Data/Application/2E8013C8-DACF-4F53-8A73-18067C9B1812/Documents/21.07.23_Munich.csv.} [Presentation] Attempt to present <UIActivityViewController: 0x10500ea00> on <_TtGC7SwiftUI19UIHostingControllerGVS_15ModifiedContentVS_7AnyViewVS_12RootModifier__: 0x105019e00> (from <_TtGC7SwiftUI19UIHostingControllerGVS_15ModifiedContentVS_7AnyViewVS_12RootModifier__: 0x105019e00>) which is already presenting <_TtGC7SwiftUI29PresentationHostingControllerVS_7AnyView_: 0x103810000>. [default] LaunchServices: store (null) or url (null) was nil: Error Domain=NSOSStatusErrorDomain Code=-54 "process may not map database" UserInfo={NSDebugDescription=process may not map database, _LSLine=66, _LSFunction=_LSServer_GetServerStoreForConnectionWithCompletionHandler} [default] Attempt to map database failed: permission was denied. This attempt will not be retried. [db] Failed to initialize client context with error Error Domain=NSOSStatusErrorDomain Code=-54 "process may not map database" UserInfo={NSDebugDescription=process may not map database, _LSLine=66, _LSFunction=_LSServer_GetServerStoreForConnectionWithCompletionHandler} [ShareSheet] connection invalidated

If I simply try String(contentsOf: exportURL) I can read the file content just fine!

I have tried to find a solution for days now and would like to ask you for help!

Thanks to some comments below, I have updated my Info.plist with these points, but it still doesn't work unfortunately:

 <key>CFBundleDocumentTypes</key> <array> <dict> <key>CFBundleTypeName</key> <string>CSV File</string> <key>LSItemContentTypes</key> <array> <string>com.lcairsports.csv</string> </array> </dict> </array> <key>UTExportedTypeDeclarations</key> <array> <dict> <key>UTTypeConformsTo</key> <array> <string>public.comma-separated-values-text</string> </array> <key>UTTypeIdentifier</key> <string>com.lcairsports.csv</string> <key>UTTypeDescription</key> <string>CSV File</string> <key>UTTypeTagSpecification</key> <dict> <key>public.filename-extension</key> <string>csv</string> </dict> </dict> </array> <key>UIFileSharingEnabled</key> <true/>
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  • I think your issue might be due to the the file types your app is exporting; this seems to be a very similar issue: stackoverflow.com/q/58149619/4187837 For the linked issue perhaps Apple tightened things up. So if you are declaring an export type for csv, this should be moved to an import declaration. Commented Jul 22, 2023 at 0:11
  • According to cocoanetics.com/2012/09/fun-with-uti it is possible to get the UTI "database" into a mess. Its an old page and mostly seems macOS centric but I found it helpful. Commented Jul 22, 2023 at 0:16
  • I found that one way to remove the errors with regard to the file not being available was to either present the file as Data rather than a URL or to pass the URL into a class that implements UIActivityItemSource (which must extend NSObject, see nemecek.be/blog/189/…). I solved my metadata issue by implementing the activityViewControllerLinkMetadata(_:) and returning an LPLinkMetadata instance see developer.apple.com/documentation/linkpresentation/… Commented Jul 24, 2023 at 2:23
  • Thank you guys! I have added some points to my info.plist (see above) but unfortunately it still doesn't work. ShareSheet doesn't appear and the error log is the same. Commented Jul 28, 2023 at 10:46
  • 1
    @LukeCrouch You should not be declaring your own CSV file type. CSV is a standard type. Have a look at the answer to the question linked in the first comment by Gavin. Perhaps there is an issue with how you write the CSV file. It may help to show the implementation of your save method. Commented Jul 29, 2023 at 18:58

2 Answers 2

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[ShareSheet] Failed to request default share mode for fileURL:file:///var/mobile/Containers/Data/Application/2E8013C8-DACF-4F53-8A73-18067C9B1812/Documents/21.07.23_Munich.csv error:Error Domain=NSOSStatusErrorDomain Code=-10814 "(null)" UserInfo={_LSLine=1569, _LSFunction=runEvaluator} [ShareSheet] Only support loading options for CKShare and SWY types. [ShareSheet] error fetching item for URL:file:///var/mobile/Containers/Data/Application/2E8013C8-DACF-4F53-8A73-18067C9B1812/Documents/21.07.23_Munich.csv : Error Domain=NSCocoaErrorDomain Code=256 "The file couldn’t be opened."

and

[ShareSheet] error loading metadata for documentURL:file:///var/mobile/Containers/Data/Application/2E8013C8-DACF-4F53-8A73-18067C9B1812/Documents/21.07.23_Munich.csv error:Error Domain=NSFileProviderInternalErrorDomain Code=0 "No valid file provider found from URL file:///var/mobile/Containers/Data/Application/2E8013C8-DACF-4F53-8A73-18067C9B1812/Documents/21.07.23_Munich.csv." UserInfo={NSLocalizedDescription=No valid file provider found from URL file:///var/mobile/Containers/Data/Application/2E8013C8-DACF-4F53-8A73-18067C9B1812/Documents/21.07.23_Munich.csv.}

I believe the above quoted errors are to do with the introduction of iOS 13. For myself these errors do not prevent the ShareSheet from showing or saving the file to Files, it is just suboptimal and a bit ugly. Full disclosure I am using UIKit rather than SwiftUI and I am Exporting a custom type.
(Hacking with Swift has a write up on the ShareSheet and SwiftUI, the article seems to target iOS16+).

That said I think that with the introduction of iOS 13 Apple have tightened up on the correct use of Exported types.
In your example you should not define your application as exporting CSV files as you do not own CSV files they are a public type, instead you should be defining that your app can be a target for importing/open CSV files. From the Apple docs:

When defining a type, you need to define it as an exported or imported type; this declaration indicates whether your app is the source of the type or whether it supports using a type defined elsewhere, respectively. If your app uses a type that this framework provides, don’t redeclare it in your app’s bundle.

Define an exported type when your app is the canonical source of information for that type. For example, if your app uses its own proprietary document format, declare it as an exported type.

Define an imported type if your app uses a type that another app defines, or if it’s a proprietary file format the system doesn’t declare. When importing a type from another app, don’t declare your own identifier; instead, use the same type identifier as the original.

As such I would try replacing the UIExportedTypeDeclarations with a UIImportedTypeDeclarations.
If I am understanding the documentation correctly UITypeIdentifier should be public.comma-separated-values-text and its UITypeConformsTo should be public.delimited-values-text.
CSV UTType (Note that the CSV UTType was introduced in iOS14)

Also I extended UIActivityItemSource to wrap the URL and then overloaded (UIActivityItemSource) activityViewControllerLinkMetadata and passed this to the UIActivityViewController list of items. This seemed to eliminate the errors relating the file url. Alternatively passing a Data representation of the file rather than URL to the UIActivityViewController list of items also seemed too work. (Note LPLinkMetadata was introduced in iOS13)

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0

It works now by using the new "ShareLink" functionality presented in iOS 16:

ShareLink("Share File", item: fileURL)
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3 Comments

Using ShareLink still gets the issue
[Presentation] Attempt to present <UIActivityViewController: 0x10500ea00> on <_TtGC7SwiftUI19UIHostingControllerGVS_15ModifiedContentVS_7AnyViewVS_12RootModifier__: 0x105019e00> (from <_TtGC7SwiftUI19UIHostingControllerGVS_15ModifiedContentVS_7AnyViewVS_12RootModifier__: 0x105019e00>) which is already presenting <_TtGC7SwiftUI29PresentationHostingControllerVS_7AnyView_: 0x103810000>. this is the issue...
ShareLink is just a UIActivityViewController wrapper for SwiftUI

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