Facebook登录-停留在白色网页SWIFT

Question

在我的LoginViewController中，我实现了FBSDKLoginButtonDelegate并导入了FBSDKLoginKit和FBSDKCoreKit。我在viewDidLoad中的代码如下所示：

    //setting up facebook login button
    var facebookLogin = FBSDKLoginButton()
    //want this button to conform to this protocol
    facebookLogin.delegate = self
    facebookLogin.readPermissions = ["public_profile", "email",   "user_friends"]
    facebookLogin.frame = CGRectMake(20, 359, 335, 30)
    self.view.addSubview(facebookLogin)

这是按钮的代码：

    public func loginButton(loginButton: FBSDKLoginButton!, didCompleteWithResult 
         result: FBSDKLoginManagerLoginResult!, error: NSError!) {

    if error != nil {
        print(error.localizedDescription)
        return
    } else {
      print("No error")
      self.performSegueWithIdentifier("loginToFeed", sender: self)
    }

}

登录后，页面停留在此白屏，而不是返回到应用程序。因此，我继续按“完成”以手动返回到应用程序，并且控制台打印出没有错误，并继续进行到提要。现在，下一个有趣的部分是尽管登录时没有错误，但我仍未登录。你知道这是怎么回事吗？我错过了一步吗？

Answer 1

如上所述，缺少应用程序委托，但在两个地方。

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

和

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