sendSynchronousRequest is deprecated in ios 9 [duplicate] - ios

Question

This question already has an answer here:
Fixing NSURLConnection Deprecation from Swift 1.2 to 2.0
(1 answer)
Closed 7 years ago.
Xcode says that sendSynchronousRequest is now deprecated.
How should I replace it?
let postData:NSData = post.dataUsingEncoding(NSASCIIStringEncoding)!
let postLength:NSString = String( postData.length )
let request:NSMutableURLRequest = NSMutableURLRequest(URL: url)
request.HTTPMethod = "POST"
request.HTTPBody = postData
request.setValue(postLength as String, forHTTPHeaderField: "Content-Length")
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
request.setValue("application/json", forHTTPHeaderField: "Accept")
var response: NSURLResponse?
var urlData: NSData?
do {
urlData = try NSURLConnection.sendSynchronousRequest(request, returningResponse:&response)
} catch _ as NSError {
urlData = nil
} catch {
fatalError()
}

Answer 1

This is a working example,
You should use NSURLSession, with Request.
func testPost(sender: UIButton) {
let session = NSURLSession.sharedSession()
let request = NSMutableURLRequest(URL: NSURL(string: "http://localhost:8080/iOSServer/ios/helloworld/swiftCalculator")!)
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
request.HTTPMethod = "POST"
let d = "4"
let data = "x=4&y=\(d)"
request.HTTPBody = data.dataUsingEncoding(NSASCIIStringEncoding)
let task = session.dataTaskWithRequest(request, completionHandler: {(data, response, error) in
if let error = error {
print(error)
}
if let data = data{
print("data =\(data)")
}
if let response = response {
print("url = \(response.URL!)")
print("response = \(response)")
let httpResponse = response as! NSHTTPURLResponse
print("response code = \(httpResponse.statusCode)")
//if you response is json do the following
do{
let resultJSON = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions())
let arrayJSON = resultJSON as! NSArray
for value in arrayJSON{
let dicValue = value as! NSDictionary
for (key, value) in dicValue {
print("key = \(key)")
print("value = \(value)")
}
}
}catch _{
print("Received not-well-formatted JSON")
}
}
})
task.resume()
}
Notice it is not necessary to use the request. you can have a data task with URL, but I added the request because in your code, you have set some headers in the request.
Notice using the completionHandler which will be called when your server responses by http response.