符合协议 - 一次又一次地添加协议存根并不能修复错误

Question

所以我有 FBViewController 类，它应该显示一个按钮让我登录和注销（只是为了测试 FB 登录）。我将它集成到新创建的项目中并且一切正常。然后我将它重新设计到我的应用程序中，但它不起作用。不确定它是否与 swift 版本或其他...使用 Xcode 10.0

import UIKit
import FBSDKLoginKit

class FBViewController: UIViewController, FBSDKLoginButtonDelegate {


    override func viewDidLoad() {
        super.viewDidLoad()
        let btnFBLogin = FBSDKLoginButton()
        btnFBLogin.readPermissions = ["public_profile", "email"]
        btnFBLogin.delegate = self
        btnFBLogin.center = self.view.center
        self.view.addSubview(btnFBLogin)

        if FBSDKAccessToken.current() != nil{
            print("Logged IN ALREADY")
            printInfo()
        }else{
            print("not logged in")
        }

    }

    func loginButton(_ loginButton: FBSDKLoginButton!, didCompleteWith result: FBSDKLoginManagerLoginResult!, error: Error!) {
        if error != nil{
            print(" error")
      //      print(error.localizedDescription)
        }else if result.isCancelled {
            print("User cancelled.")
        }
        else {
            print("Logge IN!")
            printInfo()
        }
    }

    func loginButtonDidLogOut(_ loginButton: FBSDKLoginButton!) {
        print("logged out")
    }

    func printInfo(){


        if(FBSDKAccessToken.current() != nil){

            FBSDKGraphRequest(graphPath: "me", parameters: ["fields": "id,name , first_name, last_name , email"]).start(completionHandler: { (connection, result, error) in

                guard let Info = result as? [String: Any] else { return }

                if let userName = Info["name"] as? String
                {
                    print(userName)
                }

            })
        }
    }

}

FBSDKLoginButtonDelegate

/**
 @protocol
  A delegate for `FBSDKLoginButton`
 */
@protocol FBSDKLoginButtonDelegate <NSObject>

@required
/**
  Sent to the delegate when the button was used to login.
 @param loginButton the sender
 @param result The results of the login
 @param error The error (if any) from the login
 */
- (void)loginButton:(FBSDKLoginButton *)loginButton
didCompleteWithResult:(FBSDKLoginManagerLoginResult *)result
                error:(NSError *)error;

/**
  Sent to the delegate when the button was used to logout.
 @param loginButton The button that was clicked.
*/
- (void)loginButtonDidLogOut:(FBSDKLoginButton *)loginButton;

@optional
/**
  Sent to the delegate when the button is about to login.
 @param loginButton the sender
 @return YES if the login should be allowed to proceed, NO otherwise
 */
- (BOOL) loginButtonWillLogin:(FBSDKLoginButton *)loginButton;

@end

添加协议存根只添加了 1 个已经实现的函数 (loginButton...)，它似乎无法识别它。

我尝试清理项目，删除派生数据，重新启动，但它仍然给我同样的错误：

类型 'FBViewController' 不符合协议 'FBSDKLoginButtonDelegate'

帮助表示赞赏！谢谢

Answer 1

因此，经过大量搜索后，我找到了此问题的答案，此处描述

我已经导入了 Turbolinks-ios，它有自己的 Error 结构，我不得不在方法存根中使用 Swift.Error -

 func loginButton(_ loginButton: FBSDKLoginButton!, didCompleteWith result: FBSDKLoginManagerLoginResult!, error: Swift.Error!) {...