Download the Data from URL with Header & Body Parameter in Swift 4

Download the Data from URL

Some time we need to download the data from URL like PDF file, word file , CSV file etc. Most of server required the parameter in header so we need to provide the data through header after that he will provide the final url to download , if the all required value passes correctly then it will automatically downloaded to your provided file path.

Here I have used Local file directory where we are storing all this files.

Steps:

1: We need to declare the request URL & File name:

like that: here i am downloading .pdf file

var fileName:String = ""

let date = Date()

let formatter = DateFormatter()

formatter.dateFormat = "dd.MM.yyyy"

let storeId = defaults.object(forKey: "storeId")

var url:String = ""

if currentdownload == "invoice"{

url = HOST_NAME+API;

fileName = "invoice"+formatter.string(from: date)+".pdf"

}else{

url = HOST_NAME+"mobikulmphttp/marketplace/downloadAllShipping";

fileName = "shipping"+formatter.string(from: date)+".pdf"

}

let post = NSMutableString();

post .appendFormat("storeId=%@&", storeId as! CVarArg);

post .appendFormat("dateTo=%@&", untillDateTextField.text! as CVarArg);

post .appendFormat("dateFrom=%@&", fromDateTextField.text! as CVarArg);

post .appendFormat("logParams=%@", "1" as CVarArg);

self.load(url: URL(string: url)!, params: post as String,name: fileName)

GlobalData.sharedInstance.showLoader()

Note:

self.load() -> is function which make request .

Here we are downloading .pdf file but you can download any file by adding the extension of file.

2: Now we have to make HTTP request to server and download to local directory.

func load(url: URL, params:String, name:String){

let sessionConfig = URLSessionConfiguration.default

let session = URLSession(configuration: sessionConfig)

var request = try! URLRequest(url: url, method: .post)

let postString = params;

request.httpBody = postString.data(using: .utf8)

let customerId = defaults.object(forKey:"customerId") as! String;

request.addValue(customerId, forHTTPHeaderField: "customerId")

let task = session.downloadTask(with: request) { (tempLocalUrl, response, error) in

if let tempLocalUrl = tempLocalUrl, error == nil {

// Success

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

print("Success: \(statusCode)")

GlobalData.sharedInstance.dismissLoader()

}

do{

let largeImageData = try Data(contentsOf: tempLocalUrl)

let documentsDirectoryURL = try! FileManager().url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true)

let fileURL = documentsDirectoryURL.appendingPathComponent(name);

if !FileManager.default.fileExists(atPath: fileURL.path) {

do {

try largeImageData.write(to: fileURL)

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

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

self.documentPathUrl = fileURL as NSURL;

self.performSegue(withIdentifier: "showFileData", sender: self)

})

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: { })

} catch {

print(error)

}

} else {

print("Image Not Added")

}

}catch{

print("error");

}

do {

} catch (let writeError) {

}

} else {

GlobalData.sharedInstance.dismissLoader()

print("Failure: %@", error?.localizedDescription);

}

task.resume()

}

Note: tempUrl – is path of file directory where the actual data is there so we are fetching the data and write to file .

Now you can see the file also by fetching your file manager.

kunal prasad 17 March 2018

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Download the Data from URL with Header & Body Parameter in Swift 4

Download the Data from URL

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