How to pass data from view controller to data model in swift - swift

Question

I am building a simple app that talks to a web service.
I have used the delegates method to communicate data (from my model to view controller).
But I am not sure how to read the data from view controller (text_field.text) in my model. I need to do that so that I can pass the right parameter to my webservice
my view controller is:
import UIKit
class ViewController: UIViewController,HomeModelDelegate {
var homeModel = HomeModel()
#IBOutlet weak var loginid: UITextField!
#IBOutlet weak var pwd: UITextField!
#IBAction func submit(_ sender: UIButton) {
homeModel.chkpwd()
//Here viewcontroller is assigning itself to the homemodel's delegate property
homeModel.delegate = self
}
override func viewDidLoad() {
super.viewDidLoad()
loginid.layer.cornerRadius=10
pwd.layer.cornerRadius = 10
}
func itemsDownloaded(locations: [Location]) {
loginid.text = locations[0].pwd
}
}
My model code is:
import UIKit
protocol HomeModelDelegate{
func itemsDownloaded(locations:[Location])
}
class HomeModel: NSObject
{
var delegate:HomeModelDelegate?
func chkpwd()
{
//Hit the webservice url
let x = ViewController()
let z = x.loginid
let serviceUrl = "http://www.xyz.in/webservice.php?loginid=(loginid.text)"
//download the json data
let url = URL(string: serviceUrl)
if let url = url {
let session = URLSession(configuration: .default)
let task = session.dataTask(with: url, completionHandler:
{ (data, response, error) in
if error == nil {
//succeeded
self.parseJson(data!)
}
else {
//failed
}
})
task.resume()
}
}
func parseJson(_ data:Data){
var locArray = [Location]()
do{
let jsonArray = try JSONSerialization.jsonObject(with: data, options: []) as! [Any]
for jsonResult in jsonArray{
let jsonDict = jsonResult as! [String:String]
let loc = Location(pwd: jsonDict["loginid"]!, loginid: jsonDict["pwd"]!)
locArray.append(loc)
//pass the location back to the delegate
delegate?.itemsDownloaded(locations: locArray)
}
}
catch{
print("An error occured")
}
}
}

Answer 1

Please try this :
import UIKit
class ViewController: UIViewController,HomeModelDelegate {
var homeModel = HomeModel()
#IBOutlet weak var loginid: UITextField!
#IBOutlet weak var pwd: UITextField!
#IBAction func submit(_ sender: UIButton) {
homeModel.z = loginid.text! // ASSIGNING z here
homeModel.chkpwd()
//Here viewcontroller is assigning itself to the homemodel's delegate property
homeModel.delegate = self
}
override func viewDidLoad() {
super.viewDidLoad()
loginid.layer.cornerRadius=10
pwd.layer.cornerRadius = 10
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func itemsDownloaded(locations: [Location]) {
loginid.text = locations[0].pwd
}
}
Model :
import UIKit
protocol HomeModelDelegate{
func itemsDownloaded(locations:[Location])
}
class HomeModel: NSObject
{
var z:String = "" // INITIALIZING z
var delegate:HomeModelDelegate?
func chkpwd()
{
print(z) // CALLING z
//Hit the webservice url
let serviceUrl = "http://www.xyz.in/webservice.php?loginid=(loginid.text)"
//download the json data
let url = URL(string: serviceUrl)
if let url = url {
let session = URLSession(configuration: .default)
let task = session.dataTask(with: url, completionHandler:
{ (data, response, error) in
if error == nil {
//succeeded
self.parseJson(data!)
} else {
//failed
}
})
task.resume()
}
}
func parseJson(_ data:Data){
var locArray = [Location]()
do{
let jsonArray = try JSONSerialization.jsonObject(with: data, options: []) as! [Any]
for jsonResult in jsonArray{
let jsonDict = jsonResult as! [String:String]
let loc = Location(pwd: jsonDict["loginid"]!, loginid: jsonDict["pwd"]!)
locArray.append(loc)
//pass the location back to the delegate
delegate?.itemsDownloaded(locations: locArray)
}
} catch {
print("An error occured")
}
}
}