Authentication with POST request is failing to validate data - swift

Question

So I have a created a POST request which validates the Username and Password when someone tries to login, The problem is when i press the button sender it doesn't validate the data at all even if the Username and Password field are empty it still segues you to the main Dashboard which I find it very weird.
The Button Sender from signInViewController class :
#IBAction func signInSegueToDashboard(_ sender: Any) {
APICallerPOST.shared.signInToAccount(username: emailFieldSignIn.text!, password: passwordFieldSignIn.text!) { [self] (result, error) in
switch result?.StatusCode {
case 0:
DispatchQueue.main.async {
activityLoaderSignIn.startAnimating()
}
DispatchQueue.main.asyncAfter(deadline: .now() + 3) {
guard let mainTabBarController = self.storyboard?.instantiateViewController(withIdentifier: "mainTabBarController")
else {
return
}
self.activityLoaderSignIn.stopAnimating()
mainTabBarController.modalPresentationStyle = .custom
self.present(mainTabBarController, animated: true, completion: nil)
}
case 1:
print("error")
case 2:
print("error2")
case 3:
print("error3")
case 4:
print("error4")
case 5:
print("error5")
default:
break
}
}
}
The problem is that even if the emailFieldSignIn.text! and passwordFieldSignIn.text! are empty it still segues you to the mainTabBarController without any validation of the data.
The POST request from APICallerPOST class :
func signInToAccount(username: String, password: String, completion: #escaping (SignInResponse?, Error?) -> Void) {
//declare parameter as a dictionary which contains string as key and value combination.
let parameters = ["User": username, "Password": password]
//create the url with NSURL
let url = URL(string: "https://censoredurl/Signin")!
//create the session object
let session = URLSession.shared
//now create the Request object using the url object
var request = URLRequest(url: url)
request.httpMethod = "POST" //set http method as POST
do {
request.httpBody = try JSONSerialization.data(withJSONObject: parameters, options: .prettyPrinted) // pass dictionary to data object and set it as request body
} catch let error {
print(error.localizedDescription)
completion(nil, error)
}
//HTTP Headers
request.addValue("application/json; charset=utf-8", forHTTPHeaderField: "Content-Type")
request.addValue("application/json; charset=utf-8", forHTTPHeaderField: "Accept")
//create dataTask using the session object to send data to the server
let task = session.dataTask(with: request, completionHandler: { data, response, error in
guard error == nil else {
completion(nil, error)
return
}
guard let data = data else {
completion(nil, NSError(domain: "dataNilError", code: -100001, userInfo: nil))
return
}
do {
//create json object from data
let decoder = JSONDecoder()
guard let json = try? decoder.decode(SignInResponse.self, from: data) else {
completion(nil, NSError(domain: "invalidJSONTypeError", code: -100009, userInfo: nil))
return
}
print(json)
completion(json, nil)
} catch let error {
print(error.localizedDescription)
completion(nil, error)
}
})
task.resume()
}

Answer 1

Please check my answer it will be helpfull for you I have added compulsory checks to validate if UITextfields are empty or not you can also add valid email check.
#IBAction func signInSegueToDashboard(_ sender: Any) {
if emailFieldSignIn.text!.isEmpty || passwordFieldSignIn.text!.isEmpty{
// show some error
return
}
APICallerPOST.shared.signInToAccount(username: emailFieldSignIn.text!, password: passwordFieldSignIn.text!) { [self] (result, error) in
switch result?.StatusCode {
case 0:
DispatchQueue.main.async {
activityLoaderSignIn.startAnimating()
}
DispatchQueue.main.asyncAfter(deadline: .now() + 3) {
guard let mainTabBarController = self.storyboard?.instantiateViewController(withIdentifier: "mainTabBarController")
else {
return
}
self.activityLoaderSignIn.stopAnimating()
mainTabBarController.modalPresentationStyle = .custom
self.present(mainTabBarController, animated: true, completion: nil)
}
case 1:
print("error")
case 2:
print("error2")
case 3:
print("error3")
case 4:
print("error4")
case 5:
print("error5")
default:
break
}
}
}