ios - 类型 'ViewController' 不符合协议(protocol) 'FBSDKLoginButtonDelegate'

Question

我第一次尝试在 iOS 应用程序上使用 Facebook API。我正在尝试实现一个登录按钮，就像 facebook API 文档中所说的那样。

这是我的应用委托(delegate):

import UIKit
import FBSDKCoreKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

    var window: UIWindow?


    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        // Override point for customization after application launch.
        //return true
        return FBSDKApplicationDelegate.sharedInstance().application(application, didFinishLaunchingWithOptions: launchOptions)
    }

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

这是我的 View Controller :

    import UIKit
    import FBSDKCoreKit
    import FBSDKLoginKit

    class ViewController: UIViewController, FBSDKLoginButtonDelegate
    {


       // @IBOutlet weak var testLabel: UILabel!

        override func viewDidLoad() {
            super.viewDidLoad()

            if (FBSDKAccessToken.currentAccessToken() == nil)
            {
                NSLog("Not logged in..")
            }
            else
            {
                NSLog("Logged in..")
            }

            //Création et positionnement du bouton de login Facebook
            let loginButton:FBSDKLoginButton=FBSDKLoginButton()
            loginButton.center=self.view.center
            self.view.addSubview(loginButton)
            loginButton.delegate=self
            loginButton.readPermissions=["public_profile", "email", "user_fiends"]
            NSLog("UI OK")
        }

我收到此错误“ViewController”类型不符合协议(protocol)“FBSDKLoginButtonDelegate” 在线 class ViewController: UIViewController, FBSDKLoginButtonDelegate

而我在网上找到的一个项目使用完全相同的语法，没有出现错误，项目构建也没有任何问题。

有没有人遇到同样的问题？

Answer 1

尝试实现 FBSDKLoginButtonDelegate 所需的方法。