iOS customHandlerClass example from README about generic-oauth2 HOT 1 CLOSED

  # Add your Pods here
  pod 'FacebookCore'
  pod 'FacebookLogin'

import Foundation
import FacebookCore
import FacebookLogin
import Capacitor
import ByteowlsCapacitorOauth2

@objc class FBOAuth2Handler: NSObject, OAuth2CustomHandler {
    
    var loginManager: LoginManager?;
    
    required override init() {
    }
    
    func getAccessToken(viewController: UIViewController, call: CAPPluginCall, success: @escaping (String) -> Void, cancelled: @escaping () -> Void, failure: @escaping (Error) -> Void) {
        
        if let accessToken = AccessToken.current {
            success(accessToken.tokenString)
        } else {
            DispatchQueue.main.async {
                if self.loginManager == nil {
                    self.loginManager = LoginManager()
                }
            
                self.loginManager!.logIn(permissions: [ .publicProfile ],
                                         viewController: viewController, completion: { loginResult in
                                            switch loginResult {
                                            case .failed(let error):
                                                failure(error)
                                            case .cancelled:
                                                cancelled()
                                            case .success(_, _, let accessToken):
                                                success(accessToken.tokenString)
                                            }
                })
            }
        }
    }
    
    func logout(call: CAPPluginCall) -> Bool {
        self.loginManager?.logOut()
        return true
    }
}