Show Alamofire related alert outside the API class

Question

I have file of API model which contains API call and I am getting different responses on API call and then I am parsing the call and comparing the parsing keys in code and show the alert. I do not want to show alert in API model class, I want to show alert in that other class of LoginVC which contains IBAction of Loginpressed. Please see the following code:

//API.swift
func loginApiCall(email : String,password : String, completion:@escaping (Bool) -> ()){
        

        let urlString = "\(ApiServiceProvider.BASE_URL + ApiServiceProvider.LOGIN_ENDPOINT)"
        
        let parameters = [
            "user_email": "\(email)",
            "user_password": "\(password)"
        ]

        Alamofire.request(urlString, method:.post, parameters: parameters, encoding: URLEncoding.default).validate().responseJSON {
            response in
            switch response.result {
            case .failure(let error):
       
                print(error)
                completion(false)
                
            case .success(let responseObject):
                print("response is success:  \(responseObject)")
                if let JSON = response.result.value {
                    let result = JSON as! [String:AnyObject]
                    
                    let msg = result["status"] as! String
                    
                    print(msg)
                    let message = result["message"] as! String
                    
                    let fullNameArr = message.components(separatedBy: " ")
                    print(fullNameArr)
                    
                    if msg == "error" {
         // show alert in Login VC during api call
               
                        print("Validation error")
                        
                    } else {
     
                        if msg == "NotVerified" {
                        } else {
                            
                            print("Success login")
                            completion(true)
                            
                        }
                        
                        if let data = result["data"] {
                            print(data)
                            let user = data["user_id"]
                            
                            let userdefault = UserDefaults.standard
                            userdefault.set(user!, forKey: KeyValues.userIdkey)
                        }
                        
                    }
                    print("json: \(msg)")
                }
                
            }
        }
   
    }

// LoginVC
@IBAction func LoginPressed(_ sender: LoginButton) {
        
        guard let email = emailField.text else {
            // improper
            return
        }
        
        guard let password = passField.text else {
            return
        }
        
        if email == "" || password == "" {
            
            let otherAlert = UIAlertController(title: "Fields Error!", message: "\(KeyValues.multiFieldsError)", preferredStyle: UIAlertControllerStyle.alert)
                   
            let dismiss = UIAlertAction(title: "OK", style: UIAlertActionStyle.cancel, handler: nil)
            
            otherAlert.addAction(dismiss)
            
            present(otherAlert, animated: true, completion: nil)
            
        } else {
            
            if Connectivity.isConnectedToInternet {
                showActivityIndicator(uiView: self.view)
                mainView.isHidden = false
                let apiCall = ApiServiceProvider()
                
                apiCall.loginApiCall(email: email, password: password) { success in
                    if success {
                        // show alert here which is highlighted in api class 
                        print("successful")
                        self.hideActivityIndicator(uiView: self.view)
                        self.mainView.isHidden = true
                        self.networkView.isHidden = true
                        self.performSegue(withIdentifier: "LogToWorkSpace", sender: nil)
                                           
                    } else {
                        let otherAlert = UIAlertController(title: "Error!", message: "Login failed!", preferredStyle: UIAlertControllerStyle.alert)
                        
                        
                        let dismiss = UIAlertAction(title: "OK", style: UIAlertActionStyle.cancel, handler: nil)
                        
                        otherAlert.addAction(dismiss)
                        
                        self.present(otherAlert, animated: true, completion: nil)
                        print("not successful")
                    }
                }
          
            }else{
                networkView.isHidden = false
                //print("No internet connection.")
            }
        }
    }

Answer 1

Do you want to display a custom error message?

if so add an error string to your completion closure

func loginApiCall(email : String,password : String, completion:@escaping (_ isSuccesfull :Bool, _ errorMessage :String?) ->())

then when login fails in your API class change failure to

if msg == "error" {
    // show alert in Login VC during api call
    completion(false, "Your Error Message!")

    print("Validation error")

}

then in your Login View Controller handle it

apiCall.loginApiCall(email: email, password: password) { success,errorMessage in
    if success {
        // show alert here which is highlighted in api class
        print("successful")
        self.hideActivityIndicator(uiView: self.view)
        self.mainView.isHidden = true
        self.networkView.isHidden = true
        self.performSegue(withIdentifier: "LogToWorkSpace", sender: nil)

    } else {
        if let message = errorMessage
        {
            DispatchQueue.main.async {
                let otherAlert = UIAlertController(title: "Error!", message: message, preferredStyle: UIAlertControllerStyle.alert)

                let dismiss = UIAlertAction(title: "OK", style: UIAlertActionStyle.cancel, handler: nil)

                otherAlert.addAction(dismiss)

                self.present(otherAlert, animated: true, completion: nil)
                print("not successful")
            }
        }

    }
}