Google Sign In API

Question

First of all need to say that i don\'t use CocoaPods. And it\'s first time when i use Google API.
In Google guide says that i need to configure GIDSignIn in

Answer 1

GGLContext is a part of Google so importing just GoogleSignIn will give you that error. You need to import Google library.

Link to Google Library 2.0.3 https://www.gstatic.com/cpdc/a96d915a636d0afb-Google-2.0.3.tar.gz

To Use Google Sign In. You need to conform to Both GIDSignInDelegate and GIDSignInUIDelegate and Implement delegate Methods.

class LoginViewController: UIViewController, GIDSignInDelegate, GIDSignInUIDelegate {

    func viewDidLoad() {
        GIDSignIn.sharedInstance().clientID = Resources.googlePlusClientId()
        GIDSignIn.sharedInstance().shouldFetchBasicProfile = true
        GIDSignIn.sharedInstance().scopes = ["profile", "email"]
        GIDSignIn.sharedInstance().delegate = self
        GIDSignIn.sharedInstance().uiDelegate = self
    }

    func signIn(signIn: GIDSignIn!, didSignInForUser user: GIDGoogleUser!,
            withError error: NSError!) {
    }

}

And In AppDelegate

func application(application: UIApplication,
    openURL url: NSURL, sourceApplication: String?, annotation: AnyObject?) -> Bool {
        let isFacebookURL = FBSDKApplicationDelegate.sharedInstance().application(application,
            openURL: url,
            sourceApplication: sourceApplication,
            annotation: annotation)

        let isGooglePlusURL = GIDSignIn.sharedInstance().handleURL(url,
            sourceApplication: sourceApplication,
            annotation: annotation)

        return isFacebookURL || isGooglePlusURL
}

Answer 2

For swift 5 Xcode 10.3 (Latest google signin)

Replace:

    GIDSignIn.sharedInstance().handleURL(url,
                sourceApplication: sourceApplication,
                annotation: annotation)

With: 

    GIDSignIn.sharedInstance().handle(url)

On Button click

@IBAction func googleLoginBtnPressed(_ sender: AnyObject) {
        GIDSignIn.sharedInstance()?.presentingViewController = self
        GIDSignIn.sharedInstance()?.restorePreviousSignIn()

        GIDSignIn.sharedInstance().signIn()
    }

Remove Delegate: GIDSignInUIDelegate

Answer 3

remove this line from didFinishLaunch GIDSignIn.sharedInstance().delegate = self

and in your view controller class implement GIDSignInDelegate, GIDSignInUIDelegate protocolos

and in your view controller viewDidload method write this

func viewDidLoad() {
    GIDSignIn.sharedInstance().delegate = self
    GIDSignIn.sharedInstance().uiDelegate = self
}

and don't forget to handle url in app delegate.

func application(application: UIApplication,
               openURL url: NSURL, sourceApplication: String?, annotation: AnyObject) -> Bool {

var flag: Bool = false

// handle Facebook url scheme
if let wasHandled:Bool = FBSDKApplicationDelegate.sharedInstance().application(application, openURL: url, sourceApplication: sourceApplication, annotation: annotation) {
  flag = wasHandled
}

if let googlePlusFlag: Bool = GIDSignIn.sharedInstance().handleURL(url, sourceApplication: sourceApplication!, annotation: annotation) {
  flag = googlePlusFlag
}

return flag
}