Accessing variables in protocol methods in swift - swift

Question

can anyone please help me with this swift code, i'm a swift beginner.
i'm trying to create a login page using MVC and it looks like this enter image description here
so when the user enters their login information and the status from the JSON data is "s" for a successful login it should display some test information, and when the login status is "f" for a failed login it should stay in the same login page, i'm trying to access the status in the protocol method in the code below:
so whenever the user presses the button it should take the required action but the status in the code below is nil so whenever i run the application the information is displayed wether the login was successful or not
//this piece of code is in the LoginViewController
func didReceivedLoginInfo(info : [LoginModel]) -> String
{
self.loginData = info
print("didReceivedLOOGIN count is \(loginData!.count)")//the print is successful here
for i in 0..<loginData!.count
{
print("LoginData Info : \(loginData![i])")//the print is successful here
}
statuss = loginData![0].status
print("HERE YOU GO, THIS IS WHAT I FOUND: \(statuss!)")//the print is successful here
return statuss!
}
//this piece of code is in the LoginViewController
func buttonAction(sender:UIButton!)
{
var btnsendtag: UIButton = sender
var uName = username!.text as? String!
var uPass = password!.text as? String!
parser = LoginParser()
parser!.getLoginInfo(uName!, pass: uPass!)
var status = loginData?[0].status
print("from View Controller this is the msg: \(status)")
parser!.delegate = self
if status == "s" {
print("from View Controller this is the status: \(status)")
let vc = ViewController()
let navigationController = UINavigationController(rootViewController: vc)
self.presentViewController(navigationController, animated: true, completion: nil)
}
else {
let vc = LoginViewController()
let navigationController = UINavigationController(rootViewController: vc)
self.presentViewController(navigationController, animated: true, completion: nil)
}
}
////this piece of code is in the LoginParser
import UIKit
#objc protocol LoginParserDelegate : NSObjectProtocol
{
func didReceivedLoginInfo (info : [LoginModel]) -> String
optional func didRecivedError()
}
class LoginParser: NSObject {
// var webData: NSMutableData?
var webData: NSData?
weak var delegate : LoginParserDelegate?
var name = String ()
var model : LoginModel?
var alertView:UIAlertView?
var MainLogin : [LoginModel] = []
func getLoginInfo (usern : String, pass : String){
var post:NSString = "LID=\(usern)&PWD=\(pass)&Passcode=s#v#"
var url:NSURL = NSURL(string: "some link")!
var postData:NSData = post.dataUsingEncoding(NSUTF8StringEncoding)!
var postLength:NSString = String( postData.length )
var request:NSMutableURLRequest = NSMutableURLRequest(URL: url)
request.HTTPMethod = "POST"
request.HTTPBody = postData
request.setValue(postLength as String, forHTTPHeaderField: "Content-Length")
request.setValue("application/x-www-form-urlencoded", forHTTPHeaderField: "Content-Type")
request.setValue("application/json", forHTTPHeaderField: "Accept")
var response: NSURLResponse?
let connection = NSURLConnection(request: request, delegate: self)
}
func connection(connection: NSURLConnection, didFailWithError error: NSError){
if delegate != nil {
if delegate!.respondsToSelector(Selector("didRecivedLoginInfo")){
delegate!.didRecivedError!()
}
}
}
func connection(connection: NSURLConnection, didReceiveResponse response: NSURLResponse){
webData = NSData()
}
func connection(connection: NSURLConnection, didReceiveData data: NSData){
webData! = data
}
func connectionDidFinishLoading(connection: NSURLConnection){
let responseString = NSString(data: webData!, encoding: NSUTF8StringEncoding)
print("responseString \(responseString!)")
processUserTypes ()
}
func processUserTypes ()->[LoginModel]
{
model = LoginModel()
// Process JSON
do {
let result = try NSJSONSerialization.JSONObjectWithData(webData!, options: NSJSONReadingOptions.MutableContainers)as? NSDictionary
var Login = LoginModel()
let status = result?.objectForKey("Status") as? String
let msg = result?.objectForKey("En") as? String
let employeename=result?.objectForKey("DisplayName")as? String
print("STATUS IN PARSER IS \(status!)")
if status == "s"
{
print(status!)
Login.name = employeename
Login.status = status
Login.message = msg
alertView = UIAlertView()
alertView!.title = "Login successful"
alertView!.message = "Welcome \(employeename!)"
alertView!.delegate = self
alertView!.addButtonWithTitle("OK")
alertView!.show()
MainLogin.append(Login)
print("count in login is \(MainLogin.count)")
if delegate != nil
{
delegate!.didReceivedLoginInfo(MainLogin)
}
}
else
{
Login.message = msg
alertView = UIAlertView()
alertView!.title = "Login failed"
alertView!.message = msg!
alertView!.delegate = self
alertView!.addButtonWithTitle("OK")
alertView!.show()
MainLogin.append(Login)
print("this is the main login\(MainLogin)")
}
}
catch {
if delegate != nil {
if delegate!.respondsToSelector(Selector("didRecivedLoginInfo")){
delegate!.didRecivedError!()
}
}
}
return MainLogin
}
}
can anyone help me with this?
thanks

Answer 1

you call didReceivedLoginInfoinside processUserTypeswhich is called inside connectionDidFinishLoading. buttonAction calls getLoginInfowhich does an async request that will call back connectionDidFinishLoading when it is done.
this getLoginInfowill return a long time before the request is send out and a respone is received and connectionDidFinishLoading is called.
=> you cannot do anything after you call getLogininfo
=>
for you button method
create the parser
set the delegate
call getLoginInfo
dont do anything with potential results here
for the didReceiveLoginInfo.
you can do further logic and maybe even ui stuff there (you have to wrap logic that affects the ui in a
dispatch_async(dispatch_get_main_queue()){
//here
}
call