how to make HTTPRequest with json in swift - json

Question

I am making an ios application. I am new to swift and not able to understand my code. can anyone please help me to understand what is going on with my code.
This is login application on adding email id if the email exist it should go to next view controller and if not then it should give error. I am getting difficulty in understanding my code .
Here is my code:
class checkLoginViewController: UIViewController {
#IBOutlet weak var checkUsernametextfield: UITextField!
#IBAction func checkUsernameButton(_ sender: UIButton) {
print("Clicked On SUbmit !!!!")
//Read Value from Text
let email = checkUsernametextfield.text
let myUrl = URL(string: "http://192.168.0.117/rest/signup.php");
var request = URLRequest(url:myUrl!)
request.httpMethod = "POST"// Compose a query string
let postString = "email=\(String(describing: email))";
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=\(String(describing: error))")
return
}
// You can print out response object
print("response = \(String(describing: response))")
//Let's convert response sent from a server side script to a NSDictionary object:
do {
let json = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary
if let parseJSON = json {
// Now we can access value of First Name by its key
let emailValue = parseJSON["email"] as? String
print("email: \(String(describing: emailValue))")
}
} catch {
print(error)
}
}
task.resume()
Output:
Clicked On SUbmit !!!! response = Optional( { URL: http://192.168.0.117/rest/signup.php } { Status
Code: 200, Headers {
Connection = (
"Keep-Alive"
);
"Content-Length" = (
61
);
"Content-Type" = (
"application/json"
);
Date = (
"Mon, 12 Mar 2018 06:35:58 GMT"
);
"Keep-Alive" = (
"timeout=5, max=100"
);
Server = (
"Apache/2.4.27 (Ubuntu)"
); } }) email: nil

Answer 1

Maybe try this. Hope it works.
let url = URL(string:"http://192.168.0.117/rest/signup.php")
let parameters = ["email": checkUsernametextfield.text]
var request = URLRequest(url : url!)
request.httpMethod = "POST"
request.httpBody = try? JSONSerialization.data(withJSONObject:parameters, options: [])
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
let session = URLSession.shared
session.dataTask(with: request, completionHandler: { (data, response, error) in
if let data = data {
do {
let json = try? JSONSerialization.jsonObject(with: data, options: []) as! Dictionary<String, Any>
if let json = json {
print("HERE SHOULD BE YOUR JSON \(json)")
}
}
} else {
print("Error \(String(describing: error?.localizedDescription))")
}
}).resume()

Answer 2

Here is way to send request.
enter code here
static func downloadConfig(url:URL, completion:#escaping (_ sucess:Bool , _ jsonObject: [String: String]?)->() ) {
var request = URLRequest(url: url)
request.setValue("application/x-www-form-urlencoded",
forHTTPHeaderField: "Content-Type")
request.httpMethod = "POST"
let postString = "id=13&name=Jack"
request.httpBody = postString.data(using: .utf8)
URLSession.shared.dataTask(with: request) { (data,response,error) in
if let data = data ,let httpURLResponse = response as? HTTPURLResponse, httpURLResponse.statusCode == 200 {
do {
if let todoJSON = try JSONSerialization.jsonObject(with: data, options: []) as? [String: String]{
completion(true,todoJSON)
}
else
{
completion(false,nil)
}
}
catch {
//erro parsing
completion(false,nil)
}
}
else
{
completion(false,nil)
}
}.resume()
}
use this download json function in this way.
//Download Json File
let base_url = "base_url"
let urlstr = String.init(format: "%#", base_url)
let url = URL(string: urlstr)
GameUtil.downloadConfig(url: url!) {
(sucess: Bool , jsonObject: [String:String]?) in
if sucess , jsonObject != nil
{
self.configJson = jsonObject!
}
}