SwiftUI ShareLink set file name - swift

Question

I'm using the ShareLink to share an FileDocument which contains a String. The FileDocument is conform to the Transferable protocol.
This is the FileDocument Struct:
struct TransferableDocument: FileDocument, Transferable {
static var transferRepresentation: some TransferRepresentation
{
DataRepresentation(exportedContentType: .text) { log in
log.convertToData()
}
}
// tell the system to support only text
static var readableContentTypes: [UTType] = [.text]
// by default the document is empty
var text = ""
// this initializer creates a empty document
init(initialText: String = "") {
text = initialText
}
// this initializer loads data that has been saved previously
init(configuration: ReadConfiguration) throws {
if let data = configuration.file.regularFileContents {
text = String(decoding: data, as: UTF8.self)
}
}
// this will be called when the system wants to write the data to disk
func fileWrapper(configuration: WriteConfiguration) throws -> FileWrapper {
let data = Data(text.utf8)
return FileWrapper(regularFileWithContents: data)
}
func convertToData() -> Data
{
return text.data(using: .ascii) ?? Data()
}
}
And this is the ShareLink:
var doc: TransferableDocument
{
return TransferableDocument(initialText: "I'm a String")
}
ShareLink(item: doc ,preview: SharePreview("logfile"))
{
Text("Share")
}
When using AirDrop, the filename is set to the SharePreview title, in this case "logfile". When sharing it to Apps like Mail, the filename is simply set to "text".
Is there any way to set a default filename?

Answer 1

We had a similar issue and added an additional FileRepresentation to the transferRepresentation func with the appropriate file name configured when saving out the data. With that in place when shared to Mail the appropriate file name was used.
static var transferRepresentation: some TransferRepresentation
{
DataRepresentation(exportedContentType: .text) { log in
log.convertToData()
}
FileRepresentation(exportedContentType: .text) { log in
let fileURL = FileManager.default.temporaryDirectory.appendingPathComponent("logfile").appendingPathExtension("txt")
try log.convertToData().write(to: fileURL)
return SentTransferredFile(fileURL)
}
}