如何删除应用程序沙箱中的文件？

Question

I have a UITableView set up and its data source is the app's sandbox, so all the rows are filled with the files that were imported using UIDocumentPicker , but I also need to be able to delete those files.

The delete function works, I am able to slide and delete a row and everything, but the file stays in the app's sandbox, so every time I import a new file, the rows are refilled (the TableView reloads every time something is imported) with the previously "deleted" stuff.

    func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
        if editingStyle == UITableViewCell.EditingStyle.delete {
            self.deleteFile()
            importedfiles.remove(at: indexPath.row)
            tableView.deleteRows(at: [indexPath], with: UITableView.RowAnimation.automatic)
        }

 }

Plus everything that is in the code already, I need the function to delete the file from the app's sandbox (importedfiles).

Here's what I've got so far, I am able to delete files, but only the entire directory, which is not what I want. Code:

   func deleteFile() {
        let dirPaths = FM.urls(for: .documentDirectory, in: .userDomainMask)
        let docsDir = dirPaths[0].path

        if FM.fileExists(atPath: docsDir) {
            do {
                try FM.removeItem(atPath: docsDir)
            } catch {
                print("Could not delete file: \(error)")
            }
        }
    }

Edit: "importedfiles" are files that were imported in the app's directory (documents) using UIDocumentPickerViewController. And the TableView uses this data to create cells.

Answer 1

Change your delete method to

func deleteFile(_ url: URL) {
    let fm = FileManager.default
    do {
        try fm.removeItem(at: url)
    } catch {
        print(error)
    }
}

and call it

if editingStyle == UITableViewCell.EditingStyle.delete {
    self.deleteFile(importedfiles[indexPath.row])
    importedfiles.remove(at: indexPath.row)
    tableView.deleteRows(at: [indexPath], with: UITableView.RowAnimation.automatic)
}

This should work but there is no error handling and if you want that you can define your method to return Result

func deleteFile(_ url: URL) -> Result<Void,Error> {
    let fm = FileManager.default
    do {
        try fm.removeItem(at: url)
        return .success(())
    } catch {
        return .failure(error)
    }
}

and handle the result in a switch

let result = deleteFile(importedfiles[indexPath.row])
switch result {
case .success:
    //Maybe update array and table view here
case .failure(let error):
     //dislplay error?
}