onDrop return value from loadObject

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I'm using SwiftUI on macOS, and I am trying to implement dragging & dropping folders. To do this, I'm using the onDrop api, like this:

.onDrop(of: [UTType.fileURL], isTargeted: nil) { itemProviders in
    for provider in itemProviders {
        provider.loadObject(ofClass: URL.self) { url, error in
            print(url)
        }
    }
    return true
}

However, if there are files in the drop operation, I want to return false to onDrop to signal that the operation has failed, as this should only accept folders.

The problem is, loadObject runs asynchronously. So to return a result, I would have to wait for it to complete, using something like a semaphore.

This works, but it seems rather clunky. Is there any better way of achieving this?



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