获取并显示用户'；iOS Facebook SDK中的个人资料图片

我正在使用Facebook的SDK允许用户登录到我的应用程序，我希望该应用程序显示用户的个人资料图片。我有以下故事板和Swift文件：

• Main.storyboard和ViewController.swift

• HomeAfterLogIn.storyboard和HomeAfterLogInViewController.swift

“Main”包含用户登录时使用的视图控制器，用户登录时使用的代码如下：

import UIKit
import FacebookLogin

class ViewController: UIViewController
{
    override func viewDidLoad()
    {
        super.viewDidLoad()

        if AccessToken.current != nil
        {
            // Already logged-in
            // Redirect to Home View Controller
            goToHome()
        }

        // Add LoginButton
        let loginButton = FBLoginButton(permissions: [ .publicProfile, .email, .userFriends ])
        let screenSize:CGRect = UIScreen.main.bounds
        let screenHeight = screenSize.height // real screen height
        //let's suppose we want to have 10 points bottom margin
        let newCenterY = screenHeight - loginButton.frame.height - 20
        let newCenter = CGPoint(x: view.center.x, y: newCenterY)
        loginButton.center = newCenter
        view.addSubview(loginButton)

        // Triggered after every successfully login / logout
        NotificationCenter.default.addObserver(forName: .AccessTokenDidChange, object: nil, queue: OperationQueue.main) { [weak self] _ in
            if AccessToken.current != nil {
                // Successfully just Logged in
                // Redirect to Home View Controller
                self?.goToHome()
            } else {
                // Successfully just Logged out
            }
        }
    }

    func goToHome() {
        let storyboard = UIStoryboard(name: "HomeAfterLogIn", bundle: nil)
        let vc = storyboard.instantiateViewController(withIdentifier: "HomeAfterLogInViewController") // I called mine like that (check screenshot below)
        self.navigationController?.pushViewController(vc, animated: true)
    }
}

此代码显示“使用Facebook登录”按钮，以及用户是否成功登录

func goToHome()

将用户发送到HomeAfterLogIn.storyboard，我希望在这里显示用户的个人资料图片

我在Facebooks Graph API网站上找到了以下代码：

FBSDKGraphRequest *request = [[FBSDKGraphRequest alloc]
    initWithGraphPath:@"/100046232170264/picture"
           parameters:@{ @"redirect": @"false",}
           HTTPMethod:@"GET"];
[request startWithCompletionHandler:^(FBSDKGraphRequestConnection *connection, id result, NSError *error) {
    // Insert your code here
}];

以上值与我的应用程序相关。当我将此代码插入HomeAfterLogInViewController.swift文件时，只会产生以下错误：

我输入的代码错了吗？它是以前版本的Swift，我的是Swift 4还是5？这是我第一次使用Facebook SDK

在发表评论后 （克苏右）将obj-c转换为Swift：

let request = FBSDKGraphRequest(graphPath: "/100046232170264/picture", parameters: [
    "redirect": "false"
], httpMethod: "GET")
request.start(withCompletionHandler: { connection, result, error in
    // Insert your code here
})

（Karol Zmysłowski）代码错误：

（Keshu R.）HomeAfterLogIn.storyboard中的UI项：

---

我建议创建一个自定义按钮并向其添加操作

// import 
import FBSDKCoreKit
import FBSDKLoginKit


class LoginVC : UIViewController {
    // create an IBAction and call the function inside it
    @IBAction func facebookLoginBtnPressed(_ sender : Any) {
        fetchFacebookFields()
    }
    // this function will return all the details and you can store it in userdefaults
    func fetchFacebookFields() {
        LoginManager().logIn(permissions: ["email","public_profile"], from: nil) {
            (result, error) -> Void in
            if let error = error {
                print(error.localizedDescription)
                return
            }
            guard let result = result else { return }
            if result.isCancelled { return }
            else {
                GraphRequest(graphPath: "me", parameters: ["fields" : "first_name, last_name, email"]).start() {
                    (connection, result, error) in
                    if let error = error {
                        print(error.localizedDescription)
                        return
                    }
                    if
                        let fields = result as? [String:Any],
                        let userID = fields["id"] as? String,
                        let firstName = fields["first_name"] as? String,
                        let lastName = fields["last_name"] as? String,
                        let email = fields["email"] as? String

                    {
                        let facebookProfileUrl = "http://graph.facebook.com/\(userID)/picture?type=large"
                        print("firstName -> \(firstName)")
                        print("lastName -> \(lastName)")
                        print("email -> \(email)")
                        print("facebookProfileUrl -> \(facebookProfileUrl)")
                        APPDELEGATEOBJ.makeRootVC(vcName : "MainTabBarVC")

                    }
                }
            }
        }
    }
}

---

这不是以前版本的Swift。你复制的代码是目标C:）啊，好的！这是一个巨大的帮助，有没有办法将其转换为swift？您是否将响应数据保存在任何地方？显示代码我所有的代码都显示在上面。我还添加了从obj-c转换为swift的代码，您认为如何？这给了我1个错误和1个警告。错误是：不允许在顶层使用表达式，并且该表达式位于以Profile.load开头的行上。。。警告是：从未使用过不可变值“imageURL”的初始化；考虑将赋值替换为“y”或移除它，这是从让IvaveL.WHW开始的行。是HomeAfterLogInViewController.swift吗？我是否必须添加任何UI元素，例如UIImageView？我将更新我的问题以显示我的HomeAfterLogIn.Storyboard您需要将其添加到loginViewController中。你需要添加一个按钮，然后将

facebook登录按钮连接到你的按钮上。你是否能够编辑图像以便我能完全理解？谢谢你的帮助
// import 
import FBSDKCoreKit
import FBSDKLoginKit


class LoginVC : UIViewController {
    // create an IBAction and call the function inside it
    @IBAction func facebookLoginBtnPressed(_ sender : Any) {
        fetchFacebookFields()
    }
    // this function will return all the details and you can store it in userdefaults
    func fetchFacebookFields() {
        LoginManager().logIn(permissions: ["email","public_profile"], from: nil) {
            (result, error) -> Void in
            if let error = error {
                print(error.localizedDescription)
                return
            }
            guard let result = result else { return }
            if result.isCancelled { return }
            else {
                GraphRequest(graphPath: "me", parameters: ["fields" : "first_name, last_name, email"]).start() {
                    (connection, result, error) in
                    if let error = error {
                        print(error.localizedDescription)
                        return
                    }
                    if
                        let fields = result as? [String:Any],
                        let userID = fields["id"] as? String,
                        let firstName = fields["first_name"] as? String,
                        let lastName = fields["last_name"] as? String,
                        let email = fields["email"] as? String

                    {
                        let facebookProfileUrl = "http://graph.facebook.com/\(userID)/picture?type=large"
                        print("firstName -> \(firstName)")
                        print("lastName -> \(lastName)")
                        print("email -> \(email)")
                        print("facebookProfileUrl -> \(facebookProfileUrl)")
                        APPDELEGATEOBJ.makeRootVC(vcName : "MainTabBarVC")

                    }
                }
            }
        }
    }
}