Is it possible to use async/await syntax for UIActivityViewController's completionWithItemsHandler property? - async-await

Question

I have this function:
struct Downloader {
static func presentDownloader(
in viewController: UIViewController,
with urls: [URL],
_ completion: #escaping (Bool) -> Void
) {
DispatchQueue.main.async {
let activityViewController = UIActivityViewController(
activityItems: urls,
applicationActivities: nil
)
activityViewController.completionWithItemsHandler = { _, result, _, _ in
completion(result)
}
viewController.present(
activityViewController,
animated: true,
completion: nil
)
}
}
}
It simply creates a UIActivityViewController and passes the completionWithItemsHandler as a completion block into the static func.
I am now trying to get rid of all the #escaping/closures as much as I can in order to adopt the new async/await syntax, however I don't know if I can do something here with this.
I started adding an async to my function, and realized that Xcode shows completionWithItemsHandler with an async keyword, but I really have no idea if I can achieve what I want here.
Thank you for your help

Answer 1

Yes, you can do that but you need to write yourself little wrapper over it. So it will look something like that:
#MainActor
func askToShareFile(url: URL) async {
let avc = UIActivityViewController(activityItems: [url], applicationActivities: nil)
present(avc, animated: true)
return await withCheckedContinuation { continuation in
avc.completionWithItemsHandler = { activity, completed, returnedItems, activityError in
print("Activity completed: \(completed), selected action = \(activity), items: \(returnedItems) error: \(activityError)")
if completed {
continuation.resume()
} else {
if activity == nil {
// user cancelled share sheet by closing it
continuation.resume()
}
}
}
}
}
However, important note here that, from my experimentation as of today (iOS 15.5), I can see completion handler is NOT called properly when, on share sheet, user selects any app that handle our file by copying it (activityType = com.apple.UIKit.activity.RemoteOpenInApplication-ByCopy).
If you do some changes - be careful, as you might loose continuation here so please test it yourself too.