Using POST request in HTTP method holds the UI? - ios

Question

When I tap on button it will perform a service request operation.Based on the result it will redirect to next view controller.
After loading Next view controller holds or block the UI. How to solve this issue ? I am using RestAPI and GCD first time in swift, so don't know how to solve this.....
This is login button
#IBAction func btnLogin(_ sender: Any)
{
self.api()
}
This is the function what we call.
func api()
{
let myURL = URL(string: "http://www.digi.com/laravel_api_demo/api/demoapipost")
let request = NSMutableURLRequest(url: myURL!)
request.httpMethod = "POST"
let strEmail = tfLgnID.text
let strPwd = tfPwd.text
let postString = ["username":strEmail, "password":strPwd]
//let postString = ["username":"ayush", "password":"abc"]
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
//create the session object
//let session = URLSession.shared
do {
request.httpBody = try JSONSerialization.data(withJSONObject: postString, options: .prettyPrinted) // pass dictionary to nsdata object and set it as request body
print("Successfully passed data to server")
} catch let error {
print(error.localizedDescription)
}
let postTask = URLSession.shared.dataTask(with: request as URLRequest) { (data, response, error) in
guard error == nil else {
return
}
guard let data = data else {
return
}
do {
//create json object from data
if let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String: Any] {
print("POST Method :\(json)")
let dict = json as? [String: Any]
let num = dict!["status"]
print("Status : \(num)")
print("Dict : \(dict)")
print("username : \(dict!["username"])")
print("password : \(dict!["password"])")
if dict!["status"] as! Int == 1
{
print("Successfully Logged In")
DispatchQueue.main.async {
let visitorVC = self.storyboard?.instantiateViewController(withIdentifier: "VisitorVC") as! VisitorVC
self.present(visitorVC, animated: true, completion: nil)
}
print("OK")
}
else
{
print("Not OK")
}
// handle json...
}
} catch let error {
print(error.localizedDescription)
}
}
postTask.resume()
}

Answer 1

Try this method
func api() {
var request = URLRequest(url: URL(string: "")!) // put your url
request.httpMethod = "POST"
let strEmail = tfLgnID.text
let strPwd = tfPwd.text
let postString:String = "user_id=\(strEmail)&user_id=\(strPwd)"
request.httpBody = postString.data(using: .utf8)
let task = URLSession.shared.dataTask(with: request) { data, response, error in
guard let data = data, error == nil else { // check for fundamental networking error
print("error=\(String(describing: error))")
return
}
do {
if let jsonResult = try JSONSerialization.jsonObject(with: data, options: JSONSerialization.ReadingOptions.mutableContainers) as? NSDictionary {
print(jsonResult)
let status = jsonResult["status"]! as! NSString
print("status\(status)")
DispatchQueue.main.async(execute: {
// your error Alert
})
}
else {
DispatchQueue.main.async(execute: {
let visitorVC = self.storyboard?.instantiateViewController(withIdentifier: "VisitorVC") as! VisitorVC
self.present(visitorVC, animated: true, completion: nil)
})
}
}
} catch let error as NSError {
print(error.localizedDescription)
}
if let httpStatus = response as? HTTPURLResponse, httpStatus.statusCode != 200 { // check for http errors
print("statusCode should be 200, but is \(httpStatus.statusCode)")
print("response = \(String(describing: response))")
}
let responseString = String(data: data, encoding: .utf8)
print("responseString = \(String(describing: responseString))")
}
task.resume()
}