request.swift

//MARK:API
    func loginRequest(username:String, password:String) {
        
        activityIndicator.startAnimating()
        self.fieldView.endEditing(true) //reset screen
        
        guard let url = URL(string:"http://api.lineopener.com/index.php/api/login") else { return }
        let parameters = ["email": username, "password": password]
        
        var request = URLRequest(url: url)
        request.httpMethod = "POST"
        request.addValue("application/json", forHTTPHeaderField: "Content-Type")
        guard let httpBody = try? JSONSerialization.data(withJSONObject: parameters, options: []) else { return }
        request.httpBody = httpBody
        
        let session = URLSession.shared
        session.dataTask(with: request) { (data, response, error) in
            if let response = response {
                print(response)
            }
            
            if let data = data {
                do {

//                    let dataAsString = String(data: data, encoding: .utf8)
//                        print(dataAsString)
                      do {
                            DispatchQueue.main.async(execute: {
                                self.activityIndicator.stopAnimating()
                            })
                        
                            let signin = try
                                JSONDecoder().decode(SignIn.self, from: data)
            
                                //need alerts on main thread
                                DispatchQueue.main.async(execute: {
                                    if !signin.msg.isEmpty {
                                        self.alert(msg: signin.msg)
                                    }
                                })
            
                        } catch let jsonErr {
                            print("Error: ", jsonErr)
            
                        }
                }
            }
            
            }.resume()
    }