No event generated on iOS when dismissing selection dialog

[derynia]

I opened this issue before and it seemed to be resolved, but one problem is still exists

I use this code to open dialog:
val launcher = rememberFilePickerLauncher(
type =
when (type) {
SELECT_FILE_CLICKED -> PickerType.Image
SELECT_VIDEO -> PickerType.Video
else -> PickerType.File(listOf("pdf"))
},
mode = PickerMode.Single,
title = Strings.getString("pic_a_file")
) { file ->
Napier.i(tag = "Dismiss", message = "file $file")
afterPick(file)
}
launcher.launch()

All works fine but when I dismiss dialog by swipe before it fully opened (and it's animated moving from bottom to top) there's no event generated and I don't know the dialog was dismissed.
And is also occurs now in DocumentPickerDelegate. Maybe it was there in previous version I can't be sure.
I also asked this question on apple developers form and waiting for response.
I think maybe it'll be good to put a delay between call the dialog and check if it will show say in 1-2 seconds. If not maybe consider that user dismissed it before it was fully drawn.

[vinceglb]

Hi @derynia! Thanks for reporting this issue. I reproduce your problem.

I didn't update the code of DocumentPickerDelegate, so the bug was there for both since the beginning.

I'll see how to fix it.

[derynia]

I didn't update the code of DocumentPickerDelegate, so the bug was there for both since the beginning.

The problem exists on both pickers.
But it appears only when you quickly dismiss the bottom sheet before it's fully drawn.
I think it's apple issue.
"Cancel" button or swiping down when the bottom sheet is fully drawn works fine on both types of dialogs.
Maybe you consider using modal dialog.
I'll tried to do it this way

      val controller = PHPickerViewController(configuration = configuration)
       controller.delegate = phPickerDelegate
       controller.presentationController?.delegate = phPickerDismissDelegate
       controller.modalPresentationStyle = 0

But modalPresentationStyle = 0. This way it shows it show not a bottom sheet but a whole new window. But it did't returned from the dialog

[vinceglb]

I was curious to see if other ecosystems like expo or flutter have the same issue. I checked for Expo and they also have the same issue when using imagepicker.

[anggrayudi]

The dismiss guard exists for PHPicker but was never added to the document picker.

On main (0.15.0), in FileKit.ios.kt:

Line	Picker	.delegate	presentationController.delegate
222	UIDocumentPickerViewController (save)	✅	❌
312	UIImagePickerController (camera)	✅	❌
557	UIDocumentPickerViewController (open file/directory)	✅	❌
614–615	PHPickerViewController	✅	✅

PhPickerDismissDelegate implements presentationControllerDidDismiss and resumes with an empty list, but it is only attached at line 615. Both document picker paths rely on documentPickerWasCancelled alone — which is exactly what @derynia reported as not firing when the sheet is swiped away before it finishes animating. The suspendCancellableCoroutine then never resumes.

That is from reading the code, not a reproduction. I have not measured which delegate actually fires during the presentation animation.

There may be a second, worse symptom. In an app I work on, the iOS file picker intermittently stopped opening at all, and stayed broken until the app was killed. UIKit silently ignores presentViewController() while the presenter already has a presentedViewController, and that presentation lives on the root view controller — so one stuck picker breaks every later one for the rest of the process, and leaving the screen does not help.

We patched the symptom by tearing down any leftover presentation before launching a picker, and logged the orphaned controller's class. We never confirmed the trigger, so I cannot claim it was this. But if a mid-animation swipe can leave the controller presented while the delegate never fires, that would explain it — and it would make this issue more than a missing callback.

Happy to send a PR attaching an equivalent dismiss delegate to both document picker paths, if that is the direction you want.