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Fix macios filepicker #2981
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Fix macios filepicker #2981
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4d9487c
Test file saver with export to service mode
matt-goldman ed5f254
Used correct constructor with asCopy set to true
matt-goldman 47ddfe5
Add temporary directory cleanup in file saving process
matt-goldman 07be3c6
Fixes disposal of temporary file on iOS
VladislavAntonyuk 7757fce
Merge branch 'main' into fix-macios-filepicker
TheCodeTraveler f87e43d
Fixes disposal of temporary directory on iOS
VladislavAntonyuk 08f9ffd
Update src/CommunityToolkit.Maui.Core/Essentials/FileSaver/FileSaverI…
matt-goldman 102300e
Merge branch 'main' into fix-macios-filepicker
matt-goldman d88f395
Merge branch 'main' into fix-macios-filepicker
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| Original file line number | Diff line number | Diff line change | ||||||
|---|---|---|---|---|---|---|---|---|
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@@ -29,30 +29,41 @@ async Task<string> InternalSaveAsync(string initialPath, string fileName, Stream | |||||||
| } | ||||||||
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||||||||
| var fileUrl = tempDirectoryPath.Append(fileName, false); | ||||||||
| await WriteStream(stream, fileUrl.Path ?? throw new Exception("Path cannot be null."), progress, cancellationToken); | ||||||||
| try | ||||||||
| { | ||||||||
| await WriteStream(stream, fileUrl.Path ?? throw new Exception("Path cannot be null."), progress, cancellationToken); | ||||||||
|
|
||||||||
| cancellationToken.ThrowIfCancellationRequested(); | ||||||||
| taskCompetedSource?.TrySetCanceled(CancellationToken.None); | ||||||||
| var tcs = taskCompetedSource = new(cancellationToken); | ||||||||
| cancellationToken.ThrowIfCancellationRequested(); | ||||||||
| taskCompetedSource?.TrySetCanceled(CancellationToken.None); | ||||||||
| var tcs = taskCompetedSource = new(cancellationToken); | ||||||||
|
|
||||||||
| documentPickerViewController = new([fileUrl]) | ||||||||
| { | ||||||||
| DirectoryUrl = NSUrl.FromString(initialPath) | ||||||||
| }; | ||||||||
| documentPickerViewController.DidPickDocumentAtUrls += DocumentPickerViewControllerOnDidPickDocumentAtUrls; | ||||||||
| documentPickerViewController.WasCancelled += DocumentPickerViewControllerOnWasCancelled; | ||||||||
| documentPickerViewController = new([fileUrl], true) | ||||||||
| { | ||||||||
| DirectoryUrl = NSUrl.FromString(initialPath) | ||||||||
| }; | ||||||||
| documentPickerViewController.DidPickDocumentAtUrls += DocumentPickerViewControllerOnDidPickDocumentAtUrls; | ||||||||
| documentPickerViewController.WasCancelled += DocumentPickerViewControllerOnWasCancelled; | ||||||||
|
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||||||||
| var currentViewController = Platform.GetCurrentUIViewController(); | ||||||||
| if (currentViewController is not null) | ||||||||
| { | ||||||||
| currentViewController.PresentViewController(documentPickerViewController, true, null); | ||||||||
| var currentViewController = Platform.GetCurrentUIViewController(); | ||||||||
| if (currentViewController is not null) | ||||||||
| { | ||||||||
| currentViewController.PresentViewController(documentPickerViewController, true, () => | ||||||||
| { | ||||||||
| fileManager.Remove(tempDirectoryPath, out _); | ||||||||
| }); | ||||||||
| } | ||||||||
| else | ||||||||
| { | ||||||||
| throw new FileSaveException("Unable to get a window where to present the file saver UI."); | ||||||||
| } | ||||||||
|
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||||||||
| return await tcs.Task.WaitAsync(cancellationToken).ConfigureAwait(false); | ||||||||
| } | ||||||||
| else | ||||||||
| catch | ||||||||
| { | ||||||||
| throw new FileSaveException("Unable to get a window where to present the file saver UI."); | ||||||||
| fileManager.Remove(tempDirectoryPath, out _); | ||||||||
|
||||||||
| fileManager.Remove(tempDirectoryPath, out _); | |
| fileManager.Remove(tempDirectoryPath, out _); | |
| InternalDispose(); |
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The temporary directory cleanup in the completion callback may execute prematurely before the file picker operations complete. The completion callback of
PresentViewControlleris invoked immediately after the presentation animation finishes, not after the user completes their interaction with the document picker.This means the temp directory (and the file within it) could be deleted while the UIDocumentPickerViewController is still displaying and before the user has saved the file to their chosen location, which would cause the save operation to fail.
Consider removing the cleanup from the completion callback and instead perform the cleanup in the event handlers (
DocumentPickerViewControllerOnDidPickDocumentAtUrlsandDocumentPickerViewControllerOnWasCancelled) where the actual file picker interaction is complete.There was a problem hiding this comment.
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@VladislavAntonyuk what are your thoughts on this? I had the cleanup method, which could be called in a
finallyor as part ofInternalDispose, that will always check for the file and remove it if it exists. If we restore that, it's always safe to call, and can be called from any catch or finally block, from dispose, or from the event handlers suggested here.