how to apply google login in my app

googleLogin.swift

// call the delegate on button click

// call following delegate into your view controller

//GIDSignInUIDelegate,GIDSignInDelegate

// register your app and download the googleservices-info.plist

GIDSignIn.sharedInstance().uiDelegate = self
GIDSignIn.sharedInstance().clientID = "58108526797-sen1e9fq0gnlicnkhb6krmflva86ie1k.apps.googleusercontent.com"
GIDSignIn.sharedInstance().signIn()

// call delegate function 
func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error!) {
        
        
        if (error == nil) {
            
            
            // Perform any operations on signed in user here.
            let userId = user.userID!                 // For client-side use only!
            let idToken = user.authentication.idToken // Safe to send to the server
            let fullName = user.profile.name!
            let givenName = user.profile.givenName
            let familyName = user.profile.familyName
            let email = user.profile.email!
            print("userId\(userId)")
            print("idToken\(idToken)")
            print("fullName\(fullName)")
            print("\(givenName)")
            print("\(familyName)")
            print("email\(email)")
        } else {
            print("\(error.localizedDescription)")
        }
        
    }
    
    func sign(_ signIn: GIDSignIn!, didDisconnectWith user: GIDGoogleUser!, withError error: Error!) {
        
        
        
    }
    
  
  // initiate  value on viewdidload
  
   GIDSignIn.sharedInstance().uiDelegate = self
        GIDSignIn.sharedInstance().clientID = "58108526797-sen1e9fq0gnlicnkhb6krmflva86ie1k.apps.googleusercontent.com"
        GIDSignIn.sharedInstance().delegate = self
    
  // call the following on app delegate .swift
 func application(_ application: UIApplication, open url: URL, sourceApplication: String?, annotation: Any) -> Bool {
        
        
            let handled_google =  GIDSignIn.sharedInstance().handle(url,sourceApplication: sourceApplication,annotation: annotation)
            return handled_google
        
    }
    
    
    func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {
        
        
        
        if #available(iOS 9.0, *) {
            return GIDSignIn.sharedInstance().handle(url,sourceApplication: options [UIApplicationOpenURLOptionsKey.sourceApplication] as? String,
                                                     annotation: options[UIApplicationOpenURLOptionsKey.annotation])
        } else {
            return  false
           
        }
        
        
    }