Download File Using Alamofire 4.0 (Swift 3)

Question

In older version of Alamofire. This is how I download file

    let destinationPath = Alamofire.Request.suggestedDownloadDestination( directory: .documentDirectory, domain: .userDomainMask);

    Alamofire.download(.GET, urlString, destination: destinationPath)
        .progress { bytesRead, totalBytesRead, totalBytesExpectedToRead in
//                print(totalBytesRead)
        }
        .response { request, response, _, error in

            let downloadedFilePath = destinationPath(URL(string: "")!, response!);

            NSUserDefaultsHelper.saveURL(downloadedFilePath, key: urlString);

            completion(downloadedFilePath, true);
    }

But now in the new version, my code is completely unusable and there is no similar function in the Alamofire library.

Any ideas please?

When I Google `Download File Using Alamofire 4.0 (Swift 3)`, I get a link to Alamofire's official documentation which has an [example](https://github.com/Alamofire/Alamofire#downloading-data-to-a-file) on how to download a file. Is that not useful? — Pekka, Oct 07 '16 at 08:38

score 58 · Accepted Answer · edited Jan 28 '18 at 04:45

58

I used to use this statements:

let destination = DownloadRequest.suggestedDownloadDestination(for: .documentDirectory)

Alamofire.download(
    url,
    method: .get,
    parameters: parameters,
    encoding: JSONEncoding.default,
    headers: nil,
    to: destination).downloadProgress(closure: { (progress) in
        //progress closure
    }).response(completionHandler: { (DefaultDownloadResponse) in
        //here you able to access the DefaultDownloadResponse
        //result closure
    })

For more details read more in Alamofire docs about Migration to 4.0:

edited Jan 28 '18 at 04:45

Lazy Ninja

22,342
9
83
103

answered Oct 07 '16 at 08:48

pedrouan

12,762
3
58
74

1

The code block inside the response is DefaultDownloadResponse, I am having problem in getting the final 'downloadedFilePath' – JayVDiyk Oct 07 '16 at 08:57
The actual downloaded file path is `destination + nameOfTheFile`, isn't it? – pedrouan Oct 07 '16 at 09:01
1

yes, but if you look at my code, the file name is generated automatically by Alamofire. That is why I used the destinationPath function to get the full path. – JayVDiyk Oct 07 '16 at 09:02
I may misunderstood. An answer updated. Is this what you are looking for? – pedrouan Oct 07 '16 at 09:05
i am sorry, but I am now in programming, I have downloaded an audio file, how do I get the url Path where it's saved correctly, in order to play the sound? thanks – Dumitru Rogojinaru Dec 21 '16 at 15:43
5

Can anyone tell how to open the file using the destination url after the file has been downloaded.. – Praburaj Nov 09 '17 at 13:30
DefaultDownloadResponse.destinationURL contains the url to the downloaded data – Gene Z. Ragan Dec 14 '18 at 18:46
how can i get parameters in completionHandler ? – Monish Jan 08 '19 at 06:03

score 17 · Answer 2 · answered Apr 04 '18 at 06:44

Swift 4.0

 let destination: DownloadRequest.DownloadFileDestination = { _, _ in
            var documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
            documentsURL.appendPathComponent("file.csv")
            return (documentsURL, [.removePreviousFile])
        }

        Alamofire.download(url, to: destination).responseData { response in
            if let destinationUrl = response.destinationURL {
               print("destinationUrl \(destinationUrl.absoluteURL)")
            }
        }

score 15 · Answer 3 · edited Nov 21 '17 at 21:49

There are several enhancements in Alamofire 4. The first of which is the optionality of the destination closure. Now, by default, the destination closure is nil which means the file is not moved anywhere on the file system and the temporary URL is returned.

This is the default execution:-

Alamofire.download(urlString).responseData { response in
    print("Temporary URL: \(response.temporaryURL)")
}

This is my code to download file with Alamofire 4.0 which return destination Url of file:-

let destination: DownloadRequest.DownloadFileDestination = { _, _ in
        var documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
        documentsURL.appendPathComponent("duck.png")
        return (documentsURL, [.removePreviousFile])
    }

    Alamofire.download(url, to: destination).responseData { response in
    if let destinationUrl = response.destinationURL ? {
        completionHandler(destinationUrl)
    }
}

why you use `documentsURL, [.removePreviousFile]` – ami rt Jun 09 '17 at 09:42 — ami rt, Jun 09 '17 at 09:42

score 10 · Answer 4 · answered Jan 28 '18 at 11:26

Downloading mp3 file with Alamofire 4.0 Swift 4.x

Since almost all samples seems to be about downloading an image or a JSON file, it took me hours to find the right solution.
I will share it here hoping it would help others to save some time.

func startDownload(audioUrl:String) -> Void {
    let fileUrl = self.getSaveFileUrl(fileName: audioUrl)
    let destination: DownloadRequest.DownloadFileDestination = { _, _ in
        return (fileUrl, [.removePreviousFile, .createIntermediateDirectories])
    }

    Alamofire.download(audioUrl, to:destination)
        .downloadProgress { (progress) in
            self.progressLabel.text = (String)(progress.fractionCompleted)
        }
        .responseData { (data) in
            self.progressLabel.text = "Completed!"
    }
}

func getSaveFileUrl(fileName: String) -> URL {
    let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
    let nameUrl = URL(string: fileName)
    let fileURL = documentsURL.appendingPathComponent((nameUrl?.lastPathComponent)!)
    NSLog(fileURL.absoluteString)
    return fileURL;
}

score 10 · Answer 5 · answered May 31 '20 at 15:35

For the latest versions this is how it should look like:

let destination: DownloadRequest.Destination = { _, _ in
        let documentsURL = FileManager.default.urls(for: .picturesDirectory, in: .userDomainMask)[0]
            let fileURL = documentsURL.appendingPathComponent("image.png")

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

    AF.download("https://httpbin.org/image/png", to: destination).response { response in
        debugPrint(response)

        if response.error == nil, let imagePath = response.fileURL?.path {
            let image = UIImage(contentsOfFile: imagePath)
        }
    }

score 5 · Answer 6 · answered May 24 '17 at 15:34

Swift 3 Alamofire (4.4.0):

.plist add key "App Transport Security Settings->Allow Arbitrary Loads->Yes" if you copy and paste code below:

import Alamofire

    let destination = DownloadRequest.suggestedDownloadDestination()

    Alamofire.download("http://zmp3-mp3-lossless-te-zmp3-bdhcm-1.zadn.vn/151e407bb43f5d61042e/1223048424027738068?key=f-zMo3GZKlhVibnvGMsMuQ&expires=1495726053&filename=See%20You%20Again%20-%20Wiz%20Khalifa%20Charlie%20Puth%20(NhacPro.net).flac", to: destination).downloadProgress(queue: DispatchQueue.global(qos: .utility)) { (progress) in
        print("Progress: \(progress.fractionCompleted)")
    } .validate().responseData { ( response ) in
        print(response.destinationURL!.lastPathComponent)
    }

score 4 · Answer 7 · answered May 30 '18 at 09:27

4

Use this code for download file

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

    Alamofire.request(\(downloadUrl)).downloadProgress(closure : { (progress) in
        print(progress.fractionCompleted)

    }).responseData{ (response) in
        print(response)
        print(response.result.value!)
        print(response.result.description)
           let randomString = NSUUID().uuidString
        if let data = response.result.value {

            let documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
            let videoURL = documentsURL.appendingPathComponent("\(randomString)")
            do {
                try data.write(to: videoURL)

            } catch {
                print("Something went wrong!")
            }

        }
    }

answered May 30 '18 at 09:27

Pankaj Jangid

812
9
18

Hi. I downloaded success but can not find where is my video, can u help? – famfamfam Jan 19 '19 at 16:56
@famfamfam you can find the file in document directory – Pankaj Jangid Jan 19 '19 at 18:02
Hi. here is my file url : 'file:///Users/thehe/Library/Developer/CoreSimulator/Devices/01F3C177-1B6A-4CB4-AABE-45EB0D57A3C1/data/Containers/Data/Application/DEA4544E-54A9-4104-9A7A-CAF5B9D172B3/Documents/CiviX_HistoryVideo_19-1-2019_7h59m28s.mp4' , then my error i got is 'The file “CiviX_HistoryVideo_19-1-2019_7h59m28s.mp4” couldn’t be saved in the folder “Documents”.' – famfamfam Jan 19 '19 at 18:06
@famfamfam please check progress rate, If it is 100% then It will be saved into document directory – Pankaj Jangid Jan 21 '19 at 05:33

Download File Using Alamofire 4.0 (Swift 3)

7 Answers7

Linked