Get URL from Open dialog of standard Swift document-based application

Question

I am trying to extract the URL of the document a user has selected in the default "Open" dialogue of my document based macOS application. I understand, a fileWrapper is passed to the init method but is there a way of extracting the path/URL from said wrapper?

Thanks,

Lars

Answer 1

DocumentGroup just needs a binding to the document to initialize the ContentView with, so have a func on the document grab the url & return the binding:

App:

import SwiftUI

@main
struct FileOpenApp: App {
    var body: some Scene {
        DocumentGroup(newDocument: FileOpenDocument()) { file in
            ContentView(document: file.document.setSourceURL(file))
        }
    }
}

Document:

struct FileOpenDocument: FileDocument {
    var sourceURL: URL?
    
    init() {
    }

    // needs to be mutating to avoid "self is immutable" error
    mutating func setSourceURL(_ config: FileDocumentConfiguration< FileOpenDocument >) -> Binding<FileOpenDocument> {
        sourceURL = config.fileURL
        return config.$document
    }
}