User input as global variable to display text from different views - swift

Question

I have a main View Controller than has a "Sign In" button if a user is not logged in. I then have another view controller "Login View Controller" that checks if user exists and then logs them in. Once a user has logged in via the login View Controller. I want the text of my Sign In Button on my main view controller to change to their email that they used to login. I am using a struct to try and accomplish this. My struct email variable seems to work within my Login View Controller but then does not change the string value of my button on the main view controller. Any help would be greatly appreciated.
LoginViewController.swift
class LoginViewController: NSViewController {
#IBOutlet weak var userEmailTextField: NSTextField!
struct GloablUserEmail {
static var user_status = Bool()
static var user_email = String()
}
#IBAction func LoginPushed(_ sender: AnyObject) {
GloablUserEmail.user_email = userEmailTextField.stringValue
let requestURL: NSURL = NSURL(string: "myurl")!
let urlRequest: NSMutableURLRequest = NSMutableURLRequest(url: requestURL as URL)
urlRequest.httpMethod = "POST"
let postString = "user_email=\(GloablUserEmail.user_email)&user_password=\(user_password)"
urlRequest.httpBody = postString.data(using: String.Encoding.utf8);
let session = URLSession.shared
let task = session.dataTask(with: urlRequest as URLRequest) {
(data, response, error) -> Void in
let httpResponse = response as! HTTPURLResponse
let statusCode = httpResponse.statusCode
if (statusCode == 200) {
do{
let json = try JSONSerialization.jsonObject(with: data!, options:.mutableContainers) as? NSDictionary
if let parseJSON = json {
let resultValue = parseJSON["Status"] as? String
print("result: \(resultValue)")
self.isUserRegistered = false
if(resultValue=="Success"){
GloablUserEmail.user_status = true;
UserDefaults.standard.set(true, forKey: "isUserLoggedIn");
UserDefaults.standard.synchronize();
}
}
}catch{
print("Error parsing the JSON: \(error)")
}
}
}
task.resume()
}
}
Once the result is successful and the user is verified to exist then I assign the global user_status to true.
MainViewController.swift
class ViewController: NSViewController {
#IBOutlet weak var SignInButton: NSButton!
override func viewDidLoad() {
super.viewDidLoad()
if(LoginViewController.GloablUserEmail.user_status == false){
SignInButton.title = "Sign In"
}else if(LoginViewController.GloablUserEmail.user_status == true){
SignInButton.title = LoginViewController.GloablUserEmail.user_email
}
}
}

Answer 1

You can user a simple UserDefaults extension:
extension UserDefaults{
var isLoggedIn: Bool{
return bool(forKey: "loggedIn")
}
func set(loggedIn value: Bool){
set(value, forKey: "loggedIn")
synchronize()
}
}
To set login status:
let defaults = UserDefaults.standard
defaults.set(loggedIn: true)
And check its value:
let defaults = UserDefaults.standard
defaults.isLoggedIn