您可以使用
UIdocumentInteractionController并让用户在共享URL时选择他想保存文件的位置。用户只需要选择保存到文件，然后选择要保存要导出文件的目录即可。
您可以
UIdocumentInteractionController用来共享位于应用程序捆绑包内，文档目录中或可从应用程序访问的另一个文件夹中的任何文件类型。
class ViewController: UIViewController { let documentInteractionController = UIdocumentInteractionController() func share(url: URL) { documentInteractionController.url = url documentInteractionController.uti = url.typeIdentifier ?? "public.data, public.content" documentInteractionController.name = url.localizedName ?? url.lastPathComponent documentInteractionController.presentOptionsMenu(from: view.frame, in: view, animated: true) } @IBAction func shareAction(_ sender: UIButton) { guard let url = URL(string: "https://www.ibm.com/support/knowledgecenter/SVU13_7.2.1/com.ibm.ismsaas.doc/reference/AssetsimportCompleteSample.csv?view=kc") else { return } URLSession.shared.dataTask(with: url) { data, response, error in guard let data = data, error == nil else { return } let tmpURL = FileManager.default.temporaryDirectory .appendingPathComponent(response?.suggestedFilename ?? "fileName.csv") do { try data.write(to: tmpURL) DispatchQueue.main.async { self.share(url: tmpURL) } } catch { print(error) } }.resume() }}extension URL { var typeIdentifier: String? { return (try? resourcevalues(forKeys: [.typeIdentifierKey]))?.typeIdentifier } var localizedName: String? { return (try? resourcevalues(forKeys: [.localizedNameKey]))?.localizedName }}
