[iOS] Fix : FilePicker.PickAsync Task Hangs When User Cancels the Picker in iOS

[bhavanesh2001]

Note

Are you waiting for the changes in this PR to be merged?
It would be very helpful if you could test the resulting artifacts from this PR and let us know in a comment if this change resolves your issue. Thank you!

Root Cause

The modern Picker API doesn't handle cancellations, so when the user dismisses the picker, the task’s result is never set.

Issues Fixed

Fixes #29490

[dotnet-policy-service]

Hey there @@bhavanesh2001! Thank you so much for your PR! Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[bhavanesh2001]

cc @MartyIX

[jfversluis]

@bhavanesh2001 I made big changes for MediaPicker .NET 10, can you have a look if and how we should apply that there?

[mattleibow]

/rebase

[mattleibow]

Sorry, using this PR as a guinea pig for the PR format workflow.

[bhavanesh2001]

@jfversluis I verified the new MediaPicker implementation. Cancellation appears to be handled correctly — the CompletedHandler is invoked whether the user selects media or cancels the picker, and in both cases the tcs is properly resolved.

maui/src/Essentials/src/MediaPicker/MediaPicker.ios.cs

Lines 80 to 84 in 84331b3

	Delegate = new Media.PhotoPickerDelegate
	{
	CompletedHandler = res =>
	tcs.TrySetResult(PickerResultsToMediaFile(res))
	}

[mattleibow]

/rebase

[jfversluis]

@bhavanesh2001 yeah I'm more worried about when we are going to merge this code and the .NET 10 code for MediaPicker, but we'll see about that when we get there. Thanks for this!

Bhavanesh just informed me this is File picker... Not Media picker. Time for weekend...