I have a iOS/CatalystMacOS-app that can create, save, open custom text-files (with my own file extension). This works fine. However, now I need more than text. I want to save optional files in this file as well. Apparently macOS (and iOS?) can treat folders as files. But I cannot get it to work as wanted. The folder is still treated as a folder, even if it has a file extension.
This is the code I use to create the folder:
func showNewFilePathDialog(from viewController: UIViewController, saveCompleted: URLCallback?) {
guard !isPresenting else {
return
}
let objectToSave = ...
// Find an available filename
var number = 0
var exportURL: URL!
var data: Data!
var fullFileName = ""
while true {
let numberText = number == 0 ? "" : number.asString()
fullFileName = "baseFileName" + "\(numberText).myFileExtension"
exportURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!.appendingPathComponent(fullFileName)
let dict = objectToSave.toDict()
let json = dict.json!
data = json.data(using: .utf8)!
if FileManager.default.fileExists(atPath: exportURL.path) {
number += 1
continue
} else {
break
}
}
do {
try FileManager.default.createDirectory(atPath: exportURL.path, withIntermediateDirectories: true, attributes: nil)
} catch {
NSLog("Couldn't create document directory")
viewController.presentErrorDialog(from: error)
return
}
// 2. Create containing json file
do {
try data.write(to: exportURL.appendingPathComponent("content.json"))
} catch {
viewController.presentErrorDialog(from: error)
return
}
isPresenting = true
self.onSaveDialogComplete = saveCompleted
let pickerViewController = UIDocumentPickerViewController(url: exportURL, in: .exportToService)
pickerViewController.delegate = self
viewController.present(pickerViewController, animated: true)
}
And then it appears like this in macOS finder:
It will show up similar in iOS, not allowing me to open the folder as a single file either.
Edit: Using UIDocument/public.composite-content/FileWrapper seems to work as well, but the problem still consists: When viewed in macOS finder it is still treated as a folder. Also when trying to open the app from the open-dialog via UIDocumentPickerViewController trying to open the file-bundle only opens the folder and wont let me open it into the app :(
This is my info.list Export Type UTIs:
Edit2: Also tried with removing all but com.apple.package but does not work either. Still cannot open my custom type as it behaves like a folder.