sendAsynchronousRequest was deprecated in iOS 9 (Swift 2) - Transfer Code? - ios

Question

I'm using XCode 7.3. Here is my code:
func postToServerFunction() {
let url: NSURL = NSURL(string: "http://mytesturl.com")!
let request:NSMutableURLRequest = NSMutableURLRequest(URL:url)
//let textfeld = String(UserTextField.text)
let bodyData = "data=" + UserTextField.text!
request.HTTPMethod = "POST"
request.HTTPBody = bodyData.dataUsingEncoding(NSUTF8StringEncoding);
NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue())
{
(response, data, error) in}}
This works fine and my php-Script gets the string it should. But there is the
sendAsynchronousRequest was deprecated in iOS 9
message.
As I read, with Swift 2 the method has changed.
I searched a lot for this error, but I'm not able to convert the code that it matches to Swift 2. As I also read, i should use something like this
let session = NSURLSession.sharedSession()
session.dataTaskWithRequest(request)
but I can't get it down. And actually, I don't understand every single line. I wrote the code myself, but from some examples that it works for me.

Answer 1

This is the most basic way you'd use a shared session:
if let url = NSURL(string: "http://mytesturl.com"),
userField = UserTextField.text {
let request = NSMutableURLRequest(URL: url)
let bodyData = "data=" + userField
request.HTTPMethod = "POST"
request.HTTPBody = bodyData.dataUsingEncoding(NSUTF8StringEncoding)
let session = NSURLSession.sharedSession()
let dataTask = session.dataTaskWithRequest(request,completionHandler: {(data,response,error) in
}
)
dataTask.resume()
}
For more detail on the other approaches including background and ephemeral sessions, as well as how to handle the NUSRLResponse, see my blogpost.

Answer 2

As you've found out NSURLConnection has been deprecated and NSURLSession is the new shiny.
For your example to work you still need to use the NSURL and the NSURLRequest that you have already created, and then you need an NSURLSession which you can use in various ways.
I can see that you already use the callback so in your case I assume it would be
session.dataTaskWithRequest(request) { (data, response, error) in
//magic goes here
}
and then the important thing to remember is to call resume() on your task.
So...to translate your code I'm thinking something along those lines
func postToServerFunction() {
let url: NSURL = NSURL(string: "http://mytesturl.com")!
let request:NSMutableURLRequest = NSMutableURLRequest(URL:url)
//let textfeld = String(UserTextField.text)
let bodyData = "data=" + UserTextField.text!
request.HTTPMethod = "POST"
request.HTTPBody = bodyData.dataUsingEncoding(NSUTF8StringEncoding)
let session = NSURLSession.defaultSession()
let task = session.dataTaskWithRequest(request) { (data, response, error) in
//magic goes here
}
task.resume()
}
You can read more about NSURL session in this tutorial from raywenderlich.com
Hope that helps