Here is a demo of drag & drop, tested with Xcode 11.4 / macOS 10.15.4.
Initial image
is located on assets library, accepts drop (for simplicity only) as file url from Finder/Desktop (drop) and to TextEdit (drag), registers drag for TIFF representation.
struct TestImageDragDrop: View {
@State var image = NSImage(named: "image")
@State private var dragOver = false
var body: some View {
Image(nsImage: image ?? NSImage())
.onDrop(of: ["public.file-url"], isTargeted: $dragOver) { providers -> Bool in
providers.first?.loadDataRepresentation(forTypeIdentifier: "public.file-url", completionHandler: { (data, error) in
if let data = data, let path = NSString(data: data, encoding: 4), let url = URL(string: path as String) {
let image = NSImage(contentsOf: url)
DispatchQueue.main.async {
self.image = image
}
}
})
return true
}
.onDrag {
let data = self.image?.tiffRepresentation
let provider = NSItemProvider(item: data as NSSecureCoding?, typeIdentifier: kUTTypeTIFF as String)
provider.previewImageHandler = { (handler, _, _) -> Void in
handler?(data as NSSecureCoding?, nil)
}
return provider
}
.border(dragOver ? Color.red : Color.clear)
}
}