类型“ GameViewController”不符合协议“ FBSDKLoginButtonDelegate”

Question

I am developing a mobile application and I added a Facebook login option. However, I have the error:

Type 'GameViewController' does not conform to protocol 'FBSDKLoginButtonDelegate'

I used this code:

import UIKit
import SpriteKit
import GameplayKit
import FBSDKLoginKit

class GameViewController: UIViewController, FBSDKLoginButtonDelegate {

    override func viewDidLoad() {
        //
    }
}

Answer 1

You should implement FBSDKLoginButtonDelegate's methods like this:

class GameViewController: UIViewController, FBSDKLoginButtonDelegate {
    func loginButton(_ loginButton: FBSDKLoginButton!, didCompleteWith result: FBSDKLoginManagerLoginResult!, error: Error!) {
        <#code#>
    }

    func loginButtonDidLogOut(_ loginButton: FBSDKLoginButton!) {
        <#code#>
    }


    override func viewDidLoad() {
        //
    }
}