ios：将mulitpart文件上传到AmazonS3

Question

我正在尝试从我的iOS应用上传文件到Amazon S3。我正在使用AFNetworking进行网络请求。我有以下代码将文件上传到S3：

func uploadFile(filePath: String, uploadUrl: String, returnDict: NSDictionary? = nil) {
    let fileName = filePath.lastPathComponent
    let fileType = fileName.pathExtension
    if fileName != "" && fileType != "" {
        if let data = NSData(contentsOfFile: filePath) {
            let manager = AFHTTPRequestOperationManager()

            manager.requestSerializer.setValue("application/octet-stream", forHTTPHeaderField: "Content-Type")
            manager.requestSerializer.setValue("\(data.length)", forHTTPHeaderField: "Content-Length")
            let request = manager.requestSerializer.multipartFormRequestWithMethod("PUT",
                URLString: uploadUrl,
                parameters: ["Content-Type":"\(fileType)"],
                constructingBodyWithBlock: { (formData :AFMultipartFormData!) -> Void in
                    formData.appendPartWithFileData(data,
                        name: "file",
                        fileName: uploadUrl.lastPathComponent,
                        mimeType: FileUploader.mimeType[fileType])
                },
                error: nil)

            let operation = manager.HTTPRequestOperationWithRequest(request,
                success: { (operation: AFHTTPRequestOperation!, responseObject: AnyObject!) -> Void in
                    println(uploadUrl)
                    self.delegate?.fileUploadComplete?(true, returnDict: returnDict)
                },
                failure: { (operation: AFHTTPRequestOperation!, error: NSError!) -> Void in
                    println("Error : " + error.description)
                    self.delegate?.fileUploadComplete?(false, returnDict: nil)
                })

            operation.setUploadProgressBlock({ (bytesWritten: UInt,
                totalBytesWritten: Int64,
                totalBytesExpectedToWrite: Int64) -> Void in
                    println("Wrote \(totalBytesWritten)/\(totalBytesExpectedToWrite)")
                })

            manager.operationQueue.addOperation(operation)
        }
        else {
            println("File data nil")
            delegate?.fileUploadComplete?(false, returnDict: nil)
        }
    }
    else {
        println("File path not correct")
        delegate?.fileUploadComplete?(false, returnDict: nil)
    }
}

文件完全上传到S3，但格式错误（/已损坏）。如果我上传音频，当我使用相同的网址重新下载时，文件无法播放。代表。方法仅用于通知侦听器成功或失败。由于文件大小对我来说可能太大，我需要进行分段上传。