iOS - Downloading a file from URL using an Alamofire

There are various ways to download the files from a URL but the best way to download it using Alamofire because it provides us various sub functionalities like:

a) downloadProgress : For showing the fraction completed while downloading the files.

b) validation : Allows to check the errors while downloading the files.

c) responseData: Contains the response for download.

Here is the code for using the Almofire for downloading from the URL :

// MARK: - Load URL
    func downloadUsingAlamofire(url: URL, fileName: String) {
        
        let manager = Alamofire.SessionManager.default
        
        let destination: DownloadRequest.DownloadFileDestination = { _, _ in
            self.documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]
            self.documentsURL.appendPathComponent(fileName)
            print(self.documentsURL)
            return (self.documentsURL, [.removePreviousFile])
        }
        
        manager.download(url, to: destination)
            
            .downloadProgress(queue: .main, closure: { (progress) in
                //progress closure
                print(progress.fractionCompleted)
            })
            .validate { request, response, temporaryURL, destinationURL in
                // Custom evaluation closure now includes file URLs (allows you to parse out error messages if necessary)
                GlobalData.sharedInstance.dismissLoader()
                return .success
            }
            
            .responseData { response in
                if let destinationUrl = response.destinationURL as? URL {
                    print(destinationUrl)
                    
                    if let statusCode = (response as? HTTPURLResponse)?.statusCode {
                        print("Success: \(statusCode)")
                        GlobalData.sharedInstance.dismissLoader()
                    }
                    
                    let AC = UIAlertController(title:GlobalData.sharedInstance.language(key: "success"), message:GlobalData.sharedInstance.language(key: "filesavemessage"), preferredStyle: .alert)
                    let okBtn = UIAlertAction(title: "view", style: .default, handler: {(_ action: UIAlertAction) -> Void in
                        self.documentPathUrl = response.destinationURL
                        //open file
                    })
                    let noBtn = UIAlertAction(title: GlobalData.sharedInstance.language(key: "cancel"), style: .destructive, handler: {(_ action: UIAlertAction) -> Void in
                    })
                    AC.addAction(okBtn)
                    AC.addAction(noBtn)
                    self.present(AC, animated: true, completion: { })
                } else {
                    GlobalData.sharedInstance.dismissLoader()
                }
            }
    }

// MARK: - Load URL

func downloadUsingAlamofire(url: URL, fileName: String) {

let manager = Alamofire.SessionManager.default

let destination: DownloadRequest.DownloadFileDestination = { _, _ in

self.documentsURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)[0]

self.documentsURL.appendPathComponent(fileName)

print(self.documentsURL)

return (self.documentsURL, [.removePreviousFile])

}

manager.download(url, to: destination)

.downloadProgress(queue: .main, closure: { (progress) in

//progress closure

print(progress.fractionCompleted)

})

.validate { request, response, temporaryURL, destinationURL in

// Custom evaluation closure now includes file URLs (allows you to parse out error messages if necessary)

GlobalData.sharedInstance.dismissLoader()

return .success

}

.responseData { response in

if let destinationUrl = response.destinationURL as? URL {

print(destinationUrl)

if let statusCode = (response as? HTTPURLResponse)?.statusCode {

print("Success: \(statusCode)")

GlobalData.sharedInstance.dismissLoader()

}

let AC = UIAlertController(title:GlobalData.sharedInstance.language(key: "success"), message:GlobalData.sharedInstance.language(key: "filesavemessage"), preferredStyle: .alert)

let okBtn = UIAlertAction(title: "view", style: .default, handler: {(_ action: UIAlertAction) -> Void in

self.documentPathUrl = response.destinationURL

//open file

})

let noBtn = UIAlertAction(title: GlobalData.sharedInstance.language(key: "cancel"), style: .destructive, handler: {(_ action: UIAlertAction) -> Void in

})

AC.addAction(okBtn)

AC.addAction(noBtn)

self.present(AC, animated: true, completion: { })

} else {

GlobalData.sharedInstance.dismissLoader()

}

I hope from this, it will make you more comfortable using Alamofire functionality for downloading from the URL into your app. Thanks for tuning in once again!

himanshu jindal 25 October 2021

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iOS – Downloading a file from URL using an Alamofire

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iOS – Downloading a file from URL using an Alamofire

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