IOS application can't get google user data

Question

I am learning writing ios app with Swift.

But when I follow the instruction on the Google Developers page.

https://developers.google.com/identity/sign-in/ios/start?ver=swift

Xcode show many compile wrong for me.

For example, this code on the instruction need to add in AppDelegate:

func application(application: UIApplication,
  openURL url: NSURL, sourceApplication: String?, annotation: AnyObject?) -> Bool {
    var options: [String: AnyObject] = [UIApplicationOpenURLOptionsSourceApplicationKey: sourceApplication,
                                        UIApplicationOpenURLOptionsAnnotationKey: annotation]
    return GIDSignIn.sharedInstance().handleURL(url,
        sourceApplication: sourceApplication,
        annotation: annotation)
}

This will show

ambiguous reference to member 'subscript'

And I need to change this code to:

private func application(application: UIApplication,
                     openURL url: URL, options: [String: AnyObject]) -> Bool {
        return GIDSignIn.sharedInstance().handle(url as URL!,
                                                    sourceApplication: options[UIApplicationOpenURLOptionsKey.sourceApplication.rawValue] as? String,
                                                    annotation: options[UIApplicationOpenURLOptionsKey.annotation.rawValue])
    }

Then it will pass the compiler.

Another compile error is that two code need to add in AppDelegate:

func signIn(signIn: GIDSignIn!, didSignInForUser user: GIDGoogleUser!,
  withError error: NSError!) {
    if (error == nil) {
      // Perform any operations on signed in user here.
      let userId = user.userID    
      // ...
    } else {
      print("\(error.localizedDescription)")
    }
}
func signIn(signIn: GIDSignIn!, didDisconnectWithUser user:GIDGoogleUser!,
  withError error: NSError!) {
    // Perform any operations when the user disconnects from app here.
    // ...
}

Debugger tell me that I need to replace function name

"signIn" to be "sign"

And it will pass the compiler.

The last two compile error is same as upside.

Compiler tell me that I need to change the function "signIn" as "sign" in my UIviewcontroller code.

"BUT"

Although I fully follow the compiler instructs, and successful run simulator, I still can't get the data when user allow app get the user's data.

And compiler show this for me:

Implementation of application:openURL:sourceApplication:annotation: not found. Please add the handler into your App Delegate. Class: MyClassName.AppDelegate

SO......

Do any one know why application can't find my handler?

I guess those compile errors are cause of ios updated to 10, then I don't know whether or not the action that change function's name that let me couldn't get the google's data.

Thanks for your answer. :)

Google Developers page: https://developers.google.com/identity/sign-in/ios/sign-in?ver=swift