Как дождаться значения ответа API для просмотра входа в систему с помощью Swift ⇐ IOS

[Anonymous]

Я начал изучать быстрый и не знаком с синхронными и асинхронными операциями с Swift Code.
Я хочу быть в моем представлении входа в систему (ViewController), когда пользователь входит в идентификатор, пароль, а затем запрашивает службу Из API API будет сравнивать данные базы данных, если правильный возврат json data => true, ошибка возвращает JSON data => false < /p>
Я не знаю, как это Сделайте мой login () выполнить после получения ответа API. /> Но конечный результат реализации не удался, пожалуйста, помогите мне с опытными людьми. < /p>

Код: Выделить всё

var jsonmessage: Bool? = nil

< /code>
когда onclickLogin

перейдет на следующую страницу с использованием перехода
@IBAction func onclickLogin(_ sender: Any) {

Postusercheck()
login()
}

< /code>
запрос API
func Postusercheck(){
let parameters = ["ID":txtcount.text,"Password":txtpaswoerd.text] //post request with id,password
print(parameters)
let url = URL(string: "http://" + apiip + "/api/user")! //change the url
let session = URLSession.shared
//now create the URLRequest 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
} catch let error {
print(error.localizedDescription)
}
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
let task = session.dataTask(with: request as URLRequest, completionHandler: { data, response, error in
guard error == nil else {
return
}
guard let data = data else {
return
}
do {
if let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String: Any] {
print(json)
self.jsonmessage = json["message"] as? Bool
print("Title: \(String(describing: self.abc)))")
}
} catch let error {
print(error.localizedDescription)
}
})
task.resume()
}
< /code>
func login(){

if (self.jsonmessage == true){
}
else if txtcount.text == "" || txtpaswoerd.text == "" {
let alert = UIAlertController(title: "Don't empty the field", message: "Please enter again", preferredStyle: .alert)
let ok = UIAlertAction(title: "OK", style: .default, handler: nil)

alert.addAction(ok)
present(alert, animated: true, completion: nil)

}
else
{
let alert = UIAlertController(title: "ID OR PASSWORD ERROR", message: "Please enter again", preferredStyle: .alert)
let ok = UIAlertAction(title: "OK", style: .default, handler: nil)
alert.addAction(ok)
present(alert, animated: true, completion: nil)
}
}
< /code>
========================================= = < /p>
@IBAction func onclickLogin(_ sender: Any) {

Postusercheck()
}
< /code>

func Postusercheck(){

let parameters = ["ID":txtcount.text,"Password":txtpaswoerd.text] //post request with id,password
print(parameters)
let url = URL(string: "http://" + apiip + "/api/user")! //change the url
let session = URLSession.shared
//now create the URLRequest 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
} catch let error {
print(error.localizedDescription)
}
request.addValue("application/json", forHTTPHeaderField: "Content-Type")
request.addValue("application/json", forHTTPHeaderField: "Accept")
let task = session.dataTask(with: request as URLRequest, completionHandler: { data, response, error in
guard error == nil else {
return
}
guard let data = data else {
return
}
do {
if let json = try JSONSerialization.jsonObject(with: data, options: .mutableContainers) as? [String: Any] {
print(json)
self.jsonmessage = json["message"] as? Bool
self.login()

}
} catch let error {
print(error.localizedDescription)
}
})
task.resume()
}
< /code>
func login(){
if (self.jsonmessage == true){
//Navigate to the another view controller
let mainStoryboard = UIStoryboard.init(name: "Main", bundle: nil)
let anotherViewController = mainStoryboard.instantiateViewController(withIdentifier: "AnotherViewController")
self.navigationController?.pushViewController(anotherViewController, animated: true)
}
else if txtcount.text == "" || txtpaswoerd.text == "" {
let alert = UIAlertController(title: "Don't empty the field", message: "Please enter again", preferredStyle: .alert)
let ok = UIAlertAction(title: "OK", style: .default, handler: nil)

alert.addAction(ok)
present(alert, animated: true, completion: nil)
}
else
{
let alert = UIAlertController(title: "ID OR PASSWORD ERROR", message: "Please enter again", preferredStyle: .alert)
let ok = UIAlertAction(title: "OK", style: .default, handler: nil)
alert.addAction(ok)
present(alert, animated: true, completion: nil)
}
}

< /code>
When I try the new code.
I have canceled the original segue connection. I set the Storboard ID to AnotherViewController on the page I want, but when the account password is successfully verified, he does not go to the next page.
He just stopped at the original page (after the account password verification is successful)
If I enter the wrong account password, it still get an error message. This function is useful.

Подробнее здесь: https://stackoverflow.com/questions/564 ... sing-swift