Wait response result before proceeding next code iOS swift - ios

Question

I'm beginner in iOS swift.
I have a problem: when I do a network request, the compiler executed the code below without waiting the server response.
func callingRiderLoginCopy(userID: String, Password:String, completeCode: Int) {
print("I am in callingRiderLoginCopy And Complete verification Code is \(completeCode)")
let parameters : [String : Any] = ["userId": userID, "password": Password, "verificationCode": completeCode]
guard let url = URL(string: "\(Constents.baseURL)/rider/logIn") else {
print("Invalid URL")
return
}
AF.request(url, method: .post, parameters: parameters, encoding: JSONEncoding.default)
.responseJSON { response in
switch response.result {
case .success:
if let result = response.data {
do {
let resultIs = try JSONDecoder().decode(RiderLoginCopy.self, from:result)
self.riderSuc = resultIs.success // Strore the success state in riderSuc
print("Data is riderSuc ** \(self.riderSuc)")
if let results = resultIs.user {
print("This data came from RiderLoginCopy API : \(resultIs)")
self.setToken = KeychainWrapper.standard.set(resultIs.token!, forKey: "token")
self.retrivedToken = KeychainWrapper.standard.string(forKey: "token")!
print("Retrived Token ::: \(self.retrivedToken)")
}
} catch {
print(error)
}
}
case .failure(let error):
print(error)
}
}
}
#IBAction func verifyAct(_ sender: UIButton) {
let userId = enteredUserID
KeychainWrapper.standard.string(forKey: "Password")!
let password = enteredPassword
KeychainWrapper.standard.string(forKey: "UserID")!
let completeCode:Int = Int(textField1.text! + textField2.text! + textField3.text! + textField4.text!)!
self.callingRiderLoginCopy(userID: userId, Password: password, completeCode: completeCode)
if self.riderSuc == 1 {
let storyboard = UIStoryboard(name: "Rider", bundle: nil)
let vc = storyboard.instantiateViewController(withIdentifier: "signin2VC") as! SignIn2VC
vc.verifyCode = completeCode
self.navigationController?.pushViewController(vc, animated: true)
}else{
print("Plese Try Try again RiderSuc is not equal to 1 !: ")
}
}

Answer 1

Use a closure completionHandler: parameter in your function definition of type (String?) -> Void to know when the response is received and then proceed with the rest of the code.
Modify your function from:
func callingRiderLoginCopy(userID: String, Password: String, completeCode: Int) {
To this:
func callingRiderLoginCopy(userID: String, Password:String, completeCode: Int, completionHandler: #escaping (String?) -> Void) {
And return the retrivedToken when it's received successfully and return nil when it's not.
And when you call this method modify your call from this:
self.callingRiderLoginCopy(userID: userId, Password: password, completeCode: completeCode)
To this:
self.callingRiderLoginCopy(userID: userId, Password: password, completeCode: completeCode) { token in
// Do stuff related to token
}