Swift UIDocumentPicker将选定的文档上传到AWS S3

Question

我已经完成UIDocumentPicker来选择一些文档（.pdf，音频或视频等）并打印URL路径。现在，我不知道如何在AWS S3中上传文件，但是基于AWS文档，我已在代码中正确安装了AWS配置SDK。

现在，我有两个单独的代码来选择文档并上传AWS，但我不知道如何将两者合并。

下面是我的代码

// File Storage Access
    public func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentAt url: URL) {
        let myURL = url as URL
        print(myURL)
        print("import result : \(myURL)")
        print(url.lastPathComponent)
        print(url.pathExtension)

        let filename = url.lastPathComponent
        myFiles.append(filename)
        tableView.reloadData()
    }

    public func documentMenu(_ documentMenu:UIDocumentPickerViewController, didPickDocumentPicker documentPicker: UIDocumentPickerViewController) {
        documentPicker.delegate = self
        present(documentPicker, animated: true, completion: nil)
    }

    func documentPickerWasCancelled(_ controller: UIDocumentPickerViewController) {
        print("view was cancelled")
        dismiss(animated: true, completion: nil)
    }

AWS上传文件代码

  func uploadImage(with data: Data) {
        let expression = AWSS3TransferUtilityUploadExpression()
        expression.progressBlock = progressBlock

        transferUtility.uploadData(
            data,
            bucket: S3BucketName,
            key: S3UploadKeyName,
            contentType: "image/png",
            expression: expression,
            completionHandler: completionHandler).continueWith { (task) -> AnyObject? in
                if let error = task.error {
                    print("Error: \(error.localizedDescription)")

                    DispatchQueue.main.async {
                        //cell.statusLabel.text = "Failed"
                    }
                }

                if let _ = task.result {

                    DispatchQueue.main.async {
                        //cell.statusLabel.text = "Generating Upload File"
                        print("Upload Starting!")
                    }

                    // Do something with uploadTask.
                }

                return nil;
        }
    }