Read return value php on IOS application - php

Question

Hello I'm writing an ios swift 3 application to communicate with a website, the app after doing a number of things should return a type value of false or true, but it does not happen you can tell me where I'm wrong and how to correct the mistake!
VALUE RETURN at swift:
....response = Optional( { URL: "http://....myurl.php"}.....
SWIFT CODE:
let myUrl = URL(string: "http://....myurl.php");
var request = URLRequest(url:myUrl!)
request.httpMethod = "POST"// Compose a query string
let postString = "username=James&password=Bond";
request.httpBody = postString.data(using: String.Encoding.utf8);
let task = URLSession.shared.dataTask(with: request) { (data: Data?, response: URLResponse?, error: Error?) in
if error != nil
{
print("error=\(error)");
// return false
}
print("response = \(response)")
}
task.resume()
return 0;
PHP CODE:
include 'user.php';
$user = new User();
$username= $_REQUEST["username"];
$password = $_REQUEST["password"];
if($user->login($username,$password)==true){
echo json_encode("true");
}
else{
echo json_encode("false");
}
ERROR IMAGE:

Answer 1

You need to look into data and not response.
And maybe you should encapsulate your return value in your PHP code, like this for example:
if($user->login($username,$password)==true){
echo '{"success":true}';
}else{
echo '{"success":false}';
}
And then get the result in swift:
func login(request_completed:#escaping (_ succeded:Bool) -> ()) {
let myUrl=URL(string: "http://....myurl.php");
var request=URLRequest(url:myUrl!)
request.httpMethod="POST"
let postString = "username=James&password=Bond";
request.httpBody = postString.data(using: String.Encoding.utf8);
let task=URLSession.shared.dataTask(with: request, completionHandler: { data, response, error in
guard data != nil else {
print("no data found")
request_completed(false)
return
}
do{
if let jsonData=try JSONSerialization.jsonObject(with: data!, options: JSONSerialization.ReadingOptions.mutableContainers) as? NSDictionary{
print(jsonData)
let success=jsonData.value(forKey: "success") as! Bool
if success{
print("login succeded")
request_completed(true)
return
}else{
print("login failed")
request_completed(false)
return
}
}else{
print("could not parse json")
request_completed(false)
}
}catch{
print("request failed")
request_completed(false)
}
})
task.resume()
}