检索电子邮件 FacebookSDK 和 Swift

Question

我在我的应用程序中成功实现了 facebook 登录，但我无法 query/retrieve 来自用户的电子邮件地址。

我有以下代码：

import UIKit

class testViewController: UIViewController, FBSDKLoginButtonDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        if (FBSDKAccessToken.currentAccessToken() != nil)
        {
            // User is already logged in, do work such as go to next view controller.

            // Or Show Logout Button
            let loginView : FBSDKLoginButton = FBSDKLoginButton()
            self.view.addSubview(loginView)
            loginView.center = self.view.center
            loginView.readPermissions = ["public_profile", "email", "user_friends"]
            loginView.delegate = self
            self.returnUserData()
        }
        else
        {
            let loginView : FBSDKLoginButton = FBSDKLoginButton()
            self.view.addSubview(loginView)
            loginView.center = self.view.center
            loginView.readPermissions = ["public_profile", "email", "user_friends"]
            loginView.delegate = self
        }

    }

    // Facebook Delegate Methods

    func loginButton(loginButton: FBSDKLoginButton!, didCompleteWithResult result: FBSDKLoginManagerLoginResult!, error: NSError!) {
        println("User Logged In")

        if ((error) != nil)
        {
            // Process error
        }
        else if result.isCancelled {
            // Handle cancellations
        }
        else {
            // If you ask for multiple permissions at once, you
            // should check if specific permissions missing
            if result.grantedPermissions.contains("email")
            {
                // Do work
            }

            self.returnUserData()
        }

    }

    func loginButtonDidLogOut(loginButton: FBSDKLoginButton!) {
        println("User Logged Out")
    }

    func returnUserData() {
        let graphRequest : FBSDKGraphRequest = FBSDKGraphRequest(graphPath: "me", parameters: nil)
        graphRequest.startWithCompletionHandler({ (connection, result, error) -> Void in

            if ((error) != nil)
            {
                // Process error
                println("Error: \(error)")
            }
            else
            {
                println("fetched user: \(result)")
                let userName : NSString = result.valueForKey("name") as! NSString
                println("User Name is: \(userName)")
                let userEmail : NSString = result.valueForKey("email") as! NSString
                println("User Email is: \(userEmail)")
            }
        })
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}

并且 println 输出：

fetched user: {
    id = 808101565906152;
    name = "Marcelo Pontes Machado";
}

当我尝试显示电子邮件时，我得到了一个空值。

我认为代码是正确的，也许我错过了一些导入的SDK？

Answer 1

将您想要从 Graph 请求返回的字段放入参数中

FBSDKGraphRequest(graphPath: "me", parameters: ["fields":"id,email,name,picture.width(480).height(480)"]).startWithCompletionHandler({

因为图表 API 有时可能只有 return 最少量的信息，除非另有要求。

Answer 2

在Swift

if((FBSDKAccessToken.current()) != nil)
{
    FBSDKGraphRequest(graphPath: "me", parameters: ["fields": "id, name, first_name, last_name, picture.type(large), email"]).start(completionHandler:
        { (connection, result, error) -> Void in
            if (error == nil)
            {
                //everything works print the user data
                //                        print(result!)
                if let data = result as? NSDictionary
                {
                    let firstName  = data.object(forKey: "first_name") as? String
                    let lastName  = data.object(forKey: "last_name") as? String

                    if let email = data.object(forKey: "email") as? String
                    {
                        print(email)
                    }
                    else
                    {
                         // If user have signup with mobile number you are not able to get their email address
                        print("We are unable to access Facebook account details, please use other sign in methods.")
                    }
                }
            }
    })
}

在 Objective C 中连接此代码

// START_LOADING;

[[[FBSDKGraphRequest alloc] initWithGraphPath:@"me"
                                   parameters:@{@"fields": @"picture, email,first_name,last_name"}]
 startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection, id result, NSError *error)
 {
     if (!error)
     {
         if ([result valueForKey:@"email"] != nil)
         {
             NSLog([result valueForKey:@"email"]);
         }
         else
         {
            // If user have signup with mobile number you are not able to get their email address
           NSLog(@"We are unable to access Facebook account details, please use other sign in methods.");  
           //  STOP_LOADING;
         }
     }
 }];

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