             options:[],
             metrics:metrics,
             views:views))
+        addConstraints(NSLayoutConstraint.constraints(
+            withVisualFormat:"H:|-0-[loginButton]-0-|",
+            options:[],
+            metrics:metrics,
+            views:views))
+        addConstraints(NSLayoutConstraint.constraints(
+            withVisualFormat:"V:[loginButton(40)]-10-|",
+            options:[],
+            metrics:metrics,
+            views:views))
     }
 }

        logoView.contentMode = UIViewContentMode.center
        logoView.image = #imageLiteral(resourceName: "assetGenericLogo")
        
//        let loginButton;
        
        addSubview(logoView)
        
        let views:[String:UIView] = [
            "logoView":logoView]
        
        let metrics:[String:CGFloat] = [:]
        

import UIKit
import FirebaseAuth
import FBSDKLoginKit

class VLogin:UIView
{
