SwiftUI Drag and Drop files

Question

I am trying to add a \"Drag and Drop\" gesture / function to my SwiftUI Mac application.

I want to drop files from my System/ Desktop into my Application. It is pos

Answer 1

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)
    }
}