ios - 如何在 Alamofire 4 中下载文件并保存到 Documents 目录？

Question

我正在尝试将 Alamofire4 用于 Swift3。我需要下载 .mp3 文件并将它们保存到 Documents 目录中。当前代码是这样的:

func downloadAudioFromURL(url: String, completion: ((_ status: ResponseStatus, _ audioLocalURL: URL?) -> Void)?) {


        let fileManager = FileManager.default
        let directoryURL = fileManager.urls(for: .documentDirectory, in: .userDomainMask)[0]
        let audioFullURL = String.ensureFullURLPath(url)


        alamoManager.download(audioFullURL)
            .validate { request, response, temporaryURL, destinationURL in

                var pathComponent = response.suggestedFilename!
                if pathComponent == "m4a.mp4" {
                    // Due to the old Android audio files without a filename
                    // Assign a unique name so audio files don't overwrite each other
                    pathComponent = "\(NSUUID().uuidString).mp4"
                }
                let localURL = directoryURL.appendingPathComponent(pathComponent)

                if response.statusCode == 200 {
                    completion?(.success, localURL)
                } else {
                    completion?(.failure, nil)
                }
                return .success
            }

            .responseJSON { response in
                debugPrint(response)
                print(response.temporaryURL)
                print(response.destinationURL)
        }
    }

但是我实际上无法在保存后从 localURL 访问文件。我还注意到，对于我尝试下载的不同文件，localURL 将完全相同(也许它们正在覆盖？)。例如:file:///Users/testuser/Library/Developer/CoreSimulator/Devices/D4254AEA-76DD-4F01-80AF-F1AF3BE8A204/data/Containers/Data/Application/29755154-DD21-4D4C-B340-6628607DC053/文件/file1.mp3

知道我在这里做错了什么吗？

将我的代码编辑成如下所示:

func downloadAudioFromURL(url: String, completion: ((_ status: ResponseStatus, _ audioLocalURL: URL?) -> Void)?) {

        let destination: DownloadRequest.DownloadFileDestination = { _, _ in
            var documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]

            documentsURL.appendPathComponent("Audiofile.mp3")
            return (documentsURL, [.removePreviousFile])
        }

        Alamofire.download(url, to: destination).response { response in

            if let localURL = response.destinationURL {

                completion?(.success, localURL)

            } else {

                completion?(.failure, nil)
            }

        }
}

不过，我该如何检查 m4a.mp4？

Answer 1

为什么要执行 .validate？在当前代码中下载后，您不会存储任何数据。 Alamofire allows you to store a file directly after download:

let destination: DownloadRequest.DownloadFileDestination = { _, _ in
    let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
    let fileURL = documentsURL.appendPathComponent("pig.png")

    return (fileURL, [.removePreviousFile, .createIntermediateDirectories])
}

Alamofire.download(urlString, to: destination).response { response in
    print(response)

    if response.result.isSuccess, let imagePath = response.destinationURL?.path {
        let image = UIImage(contentsOfFile: imagePath)
    }
}

顺便说一句，您在 download 方法中提供的下载路径是文档目录的本地 URL，而不是服务器的 URL。