progress view in alamo fire will not update when downloading file in swift 3

Question

I want to download a file with alamo fire and using alert with progress to show it but the progress will not move when alamo fire progress.fractionCompleted increased I use stat

Answer 1

I think your code is wrong: according to the latest Alamofire documents I make an example to show how you can modify your code:

let destination: DownloadRequest.DownloadFileDestination = { _, _ in
        let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory,
                                                                .userDomainMask, true)[0]
        let documentsURL = URL(fileURLWithPath: documentsPath, isDirectory: true)
        let fileURL = documentsURL.appendingPathComponent("myfile.pdf")

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

func requestDownloadInfo(url:String) {
            Alamofire.download(url, to :destination)
                .downloadProgress(queue: utilityQueue) { progress in
                    let progressDic = ["progress" : progress.completedUnitCount, "total" :  progress.totalUnitCount, "fraction" : progress.fractionCompleted] as [String:Any]
                    // here you can show your alert using fraction value..
                }
                .responseData { response in
                  // check your file after download or check errors...
                }
}