Swift 3: ViewController does not conform to protocol GIDSignInDelegate

[bennettl]

Describe your environment

Swift 3.0
Xcode 8
GoogleSignIn 4.0.0

Describe the problem:

Xcode keeps telling me my view controller does not conform to protocol, when I literally copy and paste the required function into my view controller. It's saying that I'm missing the method that I clearly have in my view controller (double checked method name, parameter types, etc.)

Steps to reproduce:

1. Upgraded to Swift 3.0, Xcode 8
2. Make View controller conform to protocol GIDSignInDelegate
3. Place the method in view controller:

public func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error!) {}

or
func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error!) {}

Observed Results:

Expected Results:

My app to build successfully because I followed the protocol.

[ianbarber]

That's an odd one! Looks like the type of Error is getting inferred wrong - I see UIViewController.Error which is odd, as it should be an NSError.

You might be able to force it - try declaring the protocol as Swift.Error (or maybe GoogleSignIn.Error).

[happiehappie]

But will there ever be an updated example for swift 3?

[mahesh-brainvire]

I am getting same error

[happiehappie]

Guess this issue is dead XD

[evelynklassen]

I'm getting the same error. Has anyone managed to solve it?

[happiehappie]

Try check the documentation again. It seems to be updated.

[evelynklassen]

I checked the documentation, but I'm still facing the same error.

The documentation says to use:
func signIn(signIn: GIDSignIn!, didSignInForUser user: GIDGoogleUser!, withError error: NSError!)
But the protocol is:
public func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error!).

My environment:
Xcode 8.2.1
Swift 3.0.2
GoogleSignIn 4.0.1

UPDATE
I found the error. I had a model with the name "Error", it was probably conflicting with GoogleSignIn.

[edurd]

@evelynklasse You just saved my day with that UPDATE, thanks!

[samtstern]

Looks like @evelynklassen solved this a while ago and we forgot to close it.

[dmobisoft]

I found the error. I had a model with the name "Error", it was probably conflicting with GoogleSignIn. I had remove Error class and it's working.